[PATCH v3 0/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[PATCH v3 0/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Hauke Mehrtens]

This adds initial support for Broadcom network SoC from the BCM5301X 
and BCM470X line.

The debug patch should be changed or later applied to conform with the 
new style.

If the vendor prefix should be changes to something else, I will change 
it to whatever name.

The vendor BSP also uses BCM5301X for this SoC, so I just toke that.

A bootlog can be found here:
http://pastebin.com/2FeBGCY5

Changes since v2:
 * use vendor prefix brcm
 * move code to arch/arm/mach-bcm/
 * cleanup arch/arm/mach-bcm/bcm5301x.c
 * rename to bcm5301x
 * split into more patches

Changes since v1:
 * add file Documentation/devicetree/bindings/arm/bcm4708.txt
 * rename bcm5301x to bcm4708 in dts files
 * use preprocessor includes in dts file
 * add CONFIG_ARCH_BCM53XX to multi_v7_defconfig
 * remove init_machine callback
 * rename vendor prefix from brcm to bcm
 * split into two patches


Hauke Mehrtens (3):
  ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM
    CPU
  ARM: BCM5301X: add early debugging support
  ARM: BCM5301X: add dts files for BCM4708 SoC

 Documentation/devicetree/bindings/arm/bcm4708.txt |    8 +++
 MAINTAINERS                                       |    8 +++
 arch/arm/Kconfig.debug                            |    5 ++
 arch/arm/Makefile                                 |    2 +-
 arch/arm/boot/dts/Makefile                        |    1 +
 arch/arm/boot/dts/bcm4708-netgear-r6250.dts       |   20 ++++++
 arch/arm/boot/dts/bcm4708.dtsi                    |   74 +++++++++++++++++++++
 arch/arm/configs/multi_v7_defconfig               |    1 +
 arch/arm/include/debug/bcm5301x.S                 |   19 ++++++
 arch/arm/mach-bcm/Kconfig                         |   21 ++++++
 arch/arm/mach-bcm/Makefile                        |    1 +
 arch/arm/mach-bcm/bcm5301x.c                      |   59 ++++++++++++++++
 12 files changed, 218 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/arm/bcm4708.txt
 create mode 100644 arch/arm/boot/dts/bcm4708-netgear-r6250.dts
 create mode 100644 arch/arm/boot/dts/bcm4708.dtsi
 create mode 100644 arch/arm/include/debug/bcm5301x.S
 create mode 100644 arch/arm/mach-bcm/bcm5301x.c

-- 
1.7.10.4

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Hauke Mehrtens]

This patch adds support for the BCM5301X/BCM470X SoCs with an ARM CPUs.
Currently just booting to a shell is working and nothing else, no
Ethernet, wifi, flash, ...

This SoC is used in small office and home router with Broadcom SoCs.
This code should support the BCM4707, BCM4708, BCM4709, BCM53010,
BCM53011 and BCM53012 SoC. It uses one or two ARM Cortex A9
Cores, some highlights are 2 PCIe 2.0 controllers, 4 Gigabit Ethernet
MACs and a USB 3.0 host controller.

This SoC uses a dual core CPU, but this is currently not implemented.
More information about this SoC can be found here:
http://www.anandtech.com/show/5925/broadcom-announces-bcm4708x-and-bcm5301x-socs-for-80211ac-routers

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 Documentation/devicetree/bindings/arm/bcm4708.txt |    8 +++
 MAINTAINERS                                       |    8 +++
 arch/arm/Makefile                                 |    2 +-
 arch/arm/configs/multi_v7_defconfig               |    1 +
 arch/arm/mach-bcm/Kconfig                         |   21 ++++++++
 arch/arm/mach-bcm/Makefile                        |    1 +
 arch/arm/mach-bcm/bcm5301x.c                      |   59 +++++++++++++++++++++
 7 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/arm/bcm4708.txt
 create mode 100644 arch/arm/mach-bcm/bcm5301x.c

diff --git a/Documentation/devicetree/bindings/arm/bcm4708.txt b/Documentation/devicetree/bindings/arm/bcm4708.txt
new file mode 100644
index 0000000..6b0f49f
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm4708.txt
@@ -0,0 +1,8 @@
+Broadcom BCM4708 device tree bindings
+-------------------------------------------
+
+Boards with the BCM4708 SoC shall have the following properties:
+
+Required root node property:
+
+compatible = "brcm,bcm4708";
diff --git a/MAINTAINERS b/MAINTAINERS
index bf61e04..b38f141 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1795,6 +1795,14 @@ F:	arch/arm/boot/dts/bcm2835*
 F:	arch/arm/configs/bcm2835_defconfig
 F:	drivers/*/*bcm2835*
 
+BROADCOM BCM5301X ARM ARCHICTURE
+M:	Hauke Mehrtens <hauke@hauke-m.de>
+L:	linux-arm-kernel at lists.infradead.org
+S:	Maintained
+F:	arch/arm/mach-bcm/bcm5301x.c
+F:	arch/arm/boot/dts/bcm5301*
+F:	arch/arm/boot/dts/bcm470*
+
 BROADCOM TG3 GIGABIT ETHERNET DRIVER
 M:	Nithin Nayak Sujir <nsujir@broadcom.com>
 M:	Michael Chan <mchan@broadcom.com>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c0ac0f5..230b5d7 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -145,7 +145,7 @@ textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
 # Machine directory name.  This list is sorted alphanumerically
 # by CONFIG_* macro name.
 machine-$(CONFIG_ARCH_AT91)		+= at91
-machine-$(CONFIG_ARCH_BCM)		+= bcm
+machine-y				+= bcm
 machine-$(CONFIG_ARCH_BCM2835)		+= bcm2835
 machine-$(CONFIG_ARCH_CLPS711X)		+= clps711x
 machine-$(CONFIG_ARCH_CNS3XXX)		+= cns3xxx
diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index fe0bdc3..f449bd7 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -6,6 +6,7 @@ CONFIG_ARCH_MVEBU=y
 CONFIG_MACH_ARMADA_370=y
 CONFIG_MACH_ARMADA_XP=y
 CONFIG_ARCH_BCM=y
+CONFIG_ARCH_BCM5301X=y
 CONFIG_GPIO_PCA953X=y
 CONFIG_ARCH_HIGHBANK=y
 CONFIG_ARCH_KEYSTONE=y
diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index f112895..979433b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -17,3 +17,24 @@ config ARCH_BCM
 	  It currently supports the 'BCM281XX' family, which includes
 	  BCM11130, BCM11140, BCM11351, BCM28145 and
 	  BCM28155 variants.
+
+config ARCH_BCM5301X
+	bool "Broadcom BCM470X / BCM5301X ARM SoC"
+	select CPU_V7
+	select ARM_GIC
+	select HAVE_CLK
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_TIME
+	select ARM_GLOBAL_TIMER
+	help
+	  Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
+
+	  This is a network SoC line mostly used in home routers and
+	  wifi access points.
+	  This inclused the following SoC: BCM53010, BCM53011, BCM53012,
+	  BCM53014, BCM53015, BCM53016, BCM53017, BCM53018, BCM4707,
+	  BCM4708 and BCM4709.
+
+	  Do not confuse this with the BCM4760 which is a totally
+	  different SoC or with the older BCM47XX and BCM53XX based
+	  network SoC using a MIPS CPU, they are supported by arch/mips/bcm47xx
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index 6adb6aec..b5b8046 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -13,3 +13,4 @@
 obj-$(CONFIG_ARCH_BCM)		:= board_bcm.o bcm_kona_smc.o bcm_kona_smc_asm.o
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_bcm_kona_smc_asm.o	:=-Wa,-march=armv7-a$(plus_sec)
+obj-$(CONFIG_ARCH_BCM5301X)	+= bcm5301x.o
diff --git a/arch/arm/mach-bcm/bcm5301x.c b/arch/arm/mach-bcm/bcm5301x.c
new file mode 100644
index 0000000..5168f94
--- /dev/null
+++ b/arch/arm/mach-bcm/bcm5301x.c
@@ -0,0 +1,59 @@
+/*
+ * Broadcom BCM470X / BCM5301X ARM platform code.
+ *
+ * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/irqchip.h>
+#include <linux/clocksource.h>
+#include <linux/clk-provider.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/signal.h>
+
+static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
+				 struct pt_regs *regs)
+{
+	/*
+	 * These happen for no good reason, possibly left over from CFE
+	 */
+	pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
+		addr, fsr);
+
+	/* Returning non-zero causes fault display and panic */
+	return 0;
+}
+
+static void __init bcm5301x_init_early(void)
+{
+	/* Install our hook */
+	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, 0,
+			"imprecise external abort");
+}
+
+static void __init bcm5301x_map_io(void)
+{
+	debug_ll_io_init();
+}
+
+static void __init bcm5301x_timer_init(void)
+{
+	of_clk_init(NULL);
+	clocksource_of_init();
+}
+
+static const char const *bcm5301x_dt_compat[] = {
+	"brcm,bcm4708",
+	NULL,
+};
+
+DT_MACHINE_START(BCM5301X, "BCM5301X")
+	.init_early = bcm5301x_init_early,
+	.map_io = bcm5301x_map_io,
+	.init_time = bcm5301x_timer_init,
+	.dt_compat = bcm5301x_dt_compat,
+MACHINE_END
-- 
1.7.10.4

[PATCH v3 2/3] ARM: BCM5301X: add early debugging support

[Hauke Mehrtens]

This adds support for early debugging of BCM5301X SoC.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/arm/Kconfig.debug            |    5 +++++
 arch/arm/include/debug/bcm5301x.S |   19 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 arch/arm/include/debug/bcm5301x.S

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index e401a76..3a3c8fc 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -93,6 +93,10 @@ choice
 		bool "Kernel low-level debugging on BCM2835 PL011 UART"
 		depends on ARCH_BCM2835
 
+	config DEBUG_BCM5301X
+		bool "Kernel low-level debugging on BCM5301X UART1"
+		depends on ARCH_BCM5301X
+
 	config DEBUG_CLPS711X_UART1
 		bool "Kernel low-level debugging messages via UART1"
 		depends on ARCH_CLPS711X
@@ -762,6 +766,7 @@ endchoice
 config DEBUG_LL_INCLUDE
 	string
 	default "debug/bcm2835.S" if DEBUG_BCM2835
+	default "debug/bcm5301x.S" if DEBUG_BCM5301X
 	default "debug/cns3xxx.S" if DEBUG_CNS3XXX
 	default "debug/exynos.S" if DEBUG_EXYNOS_UART
 	default "debug/highbank.S" if DEBUG_HIGHBANK_UART
diff --git a/arch/arm/include/debug/bcm5301x.S b/arch/arm/include/debug/bcm5301x.S
new file mode 100644
index 0000000..be16945
--- /dev/null
+++ b/arch/arm/include/debug/bcm5301x.S
@@ -0,0 +1,19 @@
+/*
+ * Macros used for EARLY_PRINTK, in low-level UART debug console
+ *
+ * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#define BCM5301X_UART1_PHYS	0x18000300
+#define BCM5301X_UART1_VIRT	0xf1000300
+#define BCM5301X_UART1_SH	0
+
+	.macro	addruart, rp, rv, tmp
+	ldr	\rp, =BCM5301X_UART1_PHYS 	@ MMU off, Physical
+	ldr	\rv, =BCM5301X_UART1_VIRT 	@ MMU on, Virtual
+	.endm
+
+#define UART_SHIFT	BCM5301X_UART1_SH
+#include <asm/hardware/debug-8250.S>
-- 
1.7.10.4

[PATCH v3 3/3] ARM: BCM5301X: add dts files for BCM4708 SoC

[Hauke Mehrtens]

This uses the newly added BCM5301X SoC code.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/arm/boot/dts/Makefile                  |    1 +
 arch/arm/boot/dts/bcm4708-netgear-r6250.dts |   20 ++++++++
 arch/arm/boot/dts/bcm4708.dtsi              |   74 +++++++++++++++++++++++++++
 3 files changed, 95 insertions(+)
 create mode 100644 arch/arm/boot/dts/bcm4708-netgear-r6250.dts
 create mode 100644 arch/arm/boot/dts/bcm4708.dtsi

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 641b3c9..6329f2d 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -43,6 +43,7 @@ dtb-$(CONFIG_ARCH_AT91)	+= sama5d35ek.dtb
 
 dtb-$(CONFIG_ARCH_BCM2835) += bcm2835-rpi-b.dtb
 dtb-$(CONFIG_ARCH_BCM) += bcm11351-brt.dtb
+dtb-$(CONFIG_ARCH_BCM5301X) += bcm4708-netgear-r6250.dtb
 dtb-$(CONFIG_ARCH_DAVINCI) += da850-enbw-cmc.dtb \
 	da850-evm.dtb
 dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
diff --git a/arch/arm/boot/dts/bcm4708-netgear-r6250.dts b/arch/arm/boot/dts/bcm4708-netgear-r6250.dts
new file mode 100644
index 0000000..34875f6
--- /dev/null
+++ b/arch/arm/boot/dts/bcm4708-netgear-r6250.dts
@@ -0,0 +1,20 @@
+/*
+ * Broadcom BCM470X / BCM5301X arm platform code.
+ *
+ * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+/dts-v1/;
+
+#include "bcm4708.dtsi"
+
+/ {
+	compatible = "netgear,r6250v1", "brcm,bcm4708";
+	model = "Netgear R6250 V1 (BCM4708)";
+
+	memory {
+		reg = <0x00000000 0x08000000>;
+	};
+};
diff --git a/arch/arm/boot/dts/bcm4708.dtsi b/arch/arm/boot/dts/bcm4708.dtsi
new file mode 100644
index 0000000..fbf1dcf
--- /dev/null
+++ b/arch/arm/boot/dts/bcm4708.dtsi
@@ -0,0 +1,74 @@
+/*
+ * Broadcom BCM470X / BCM5301X ARM platform code.
+ *
+ * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+#include "skeleton.dtsi"
+
+/ {
+	compatible = "brcm,bcm4708";
+	model = "Broadcom BCM4708";
+	interrupt-parent = <&gic>;
+
+	chosen {
+		bootargs = "console=ttyS0,115200 earlyprintk debug";
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu at 0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a9";
+			reg = <0>;
+		};
+	};
+
+	clocks {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		clk_periph: periph {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <400000000>;
+		};
+	};
+
+	uart at 18000300 {
+		compatible = "ns16550";
+		reg = <0x18000300 0x100>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <100000000>;
+	};
+
+	uart at 18000400 {
+		compatible = "ns16550";
+		reg = <0x18000400 0x100>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <100000000>;
+	};
+
+	gic: interrupt-controller at 19021000 {
+		compatible = "arm,cortex-a9-gic";
+		#interrupt-cells = <3>;
+		#address-cells = <0>;
+		interrupt-controller;
+		reg = <0x19021000 0x1000>,
+		      <0x19020100 0x100>;
+	};
+
+	timer at 19020200 {
+		compatible = "arm,cortex-a9-global-timer";
+		reg = <0x19020200 0x100>;
+		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clk_periph>;
+	};
+};
-- 
1.7.10.4

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Domenico Andreoli]

On Fri, Jul 26, 2013 at 12:42:13AM +0200, Hauke Mehrtens wrote:
> This patch adds support for the BCM5301X/BCM470X SoCs with an ARM CPUs.
> Currently just booting to a shell is working and nothing else, no
> Ethernet, wifi, flash, ...
> 
> This SoC is used in small office and home router with Broadcom SoCs.
> This code should support the BCM4707, BCM4708, BCM4709, BCM53010,
> BCM53011 and BCM53012 SoC. It uses one or two ARM Cortex A9
> Cores, some highlights are 2 PCIe 2.0 controllers, 4 Gigabit Ethernet
> MACs and a USB 3.0 host controller.
> 
> This SoC uses a dual core CPU, but this is currently not implemented.
> More information about this SoC can be found here:
> http://www.anandtech.com/show/5925/broadcom-announces-bcm4708x-and-bcm5301x-socs-for-80211ac-routers
> 
> Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
> ---
>  Documentation/devicetree/bindings/arm/bcm4708.txt |    8 +++
>  MAINTAINERS                                       |    8 +++
>  arch/arm/Makefile                                 |    2 +-
>  arch/arm/configs/multi_v7_defconfig               |    1 +
>  arch/arm/mach-bcm/Kconfig                         |   21 ++++++++
>  arch/arm/mach-bcm/Makefile                        |    1 +
>  arch/arm/mach-bcm/bcm5301x.c                      |   59 +++++++++++++++++++++
>  7 files changed, 99 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/bcm4708.txt
>  create mode 100644 arch/arm/mach-bcm/bcm5301x.c
> 
> diff --git a/Documentation/devicetree/bindings/arm/bcm4708.txt b/Documentation/devicetree/bindings/arm/bcm4708.txt
> new file mode 100644
> index 0000000..6b0f49f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/bcm4708.txt
> @@ -0,0 +1,8 @@
> +Broadcom BCM4708 device tree bindings
> +-------------------------------------------
> +
> +Boards with the BCM4708 SoC shall have the following properties:
> +
> +Required root node property:
> +
> +compatible = "brcm,bcm4708";
> diff --git a/MAINTAINERS b/MAINTAINERS
> index bf61e04..b38f141 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1795,6 +1795,14 @@ F:	arch/arm/boot/dts/bcm2835*
>  F:	arch/arm/configs/bcm2835_defconfig
>  F:	drivers/*/*bcm2835*
>  
> +BROADCOM BCM5301X ARM ARCHICTURE
> +M:	Hauke Mehrtens <hauke@hauke-m.de>
> +L:	linux-arm-kernel at lists.infradead.org
> +S:	Maintained
> +F:	arch/arm/mach-bcm/bcm5301x.c
> +F:	arch/arm/boot/dts/bcm5301*
> +F:	arch/arm/boot/dts/bcm470*
> +
>  BROADCOM TG3 GIGABIT ETHERNET DRIVER
>  M:	Nithin Nayak Sujir <nsujir@broadcom.com>
>  M:	Michael Chan <mchan@broadcom.com>
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index c0ac0f5..230b5d7 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -145,7 +145,7 @@ textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
>  # Machine directory name.  This list is sorted alphanumerically
>  # by CONFIG_* macro name.
>  machine-$(CONFIG_ARCH_AT91)		+= at91
> -machine-$(CONFIG_ARCH_BCM)		+= bcm
> +machine-y				+= bcm
>  machine-$(CONFIG_ARCH_BCM2835)		+= bcm2835
>  machine-$(CONFIG_ARCH_CLPS711X)		+= clps711x
>  machine-$(CONFIG_ARCH_CNS3XXX)		+= cns3xxx
> diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
> index fe0bdc3..f449bd7 100644
> --- a/arch/arm/configs/multi_v7_defconfig
> +++ b/arch/arm/configs/multi_v7_defconfig
> @@ -6,6 +6,7 @@ CONFIG_ARCH_MVEBU=y
>  CONFIG_MACH_ARMADA_370=y
>  CONFIG_MACH_ARMADA_XP=y
>  CONFIG_ARCH_BCM=y
> +CONFIG_ARCH_BCM5301X=y
>  CONFIG_GPIO_PCA953X=y
>  CONFIG_ARCH_HIGHBANK=y
>  CONFIG_ARCH_KEYSTONE=y
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index f112895..979433b 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -17,3 +17,24 @@ config ARCH_BCM
>  	  It currently supports the 'BCM281XX' family, which includes
>  	  BCM11130, BCM11140, BCM11351, BCM28145 and
>  	  BCM28155 variants.
> +
> +config ARCH_BCM5301X
> +	bool "Broadcom BCM470X / BCM5301X ARM SoC"

should be

	bool "Broadcom BCM470X / BCM5301X ARM SoC" if ARCH_MULTI_V7

or the entry will be visible also when no multi ARMv7 is wanted 

> +	select CPU_V7

not needed when ARCH_MULTI_V7 is configured and give issues if only
ARCH_MULTI_V6 is selected

> +	select ARM_GIC
> +	select HAVE_CLK
> +	select GENERIC_CLOCKEVENTS
> +	select GENERIC_TIME
> +	select ARM_GLOBAL_TIMER
> +	help
> +	  Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
> +
> +	  This is a network SoC line mostly used in home routers and
> +	  wifi access points.
> +	  This inclused the following SoC: BCM53010, BCM53011, BCM53012,
> +	  BCM53014, BCM53015, BCM53016, BCM53017, BCM53018, BCM4707,
> +	  BCM4708 and BCM4709.
> +
> +	  Do not confuse this with the BCM4760 which is a totally
> +	  different SoC or with the older BCM47XX and BCM53XX based
> +	  network SoC using a MIPS CPU, they are supported by arch/mips/bcm47xx
> diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
> index 6adb6aec..b5b8046 100644
> --- a/arch/arm/mach-bcm/Makefile
> +++ b/arch/arm/mach-bcm/Makefile
> @@ -13,3 +13,4 @@
>  obj-$(CONFIG_ARCH_BCM)		:= board_bcm.o bcm_kona_smc.o bcm_kona_smc_asm.o
>  plus_sec := $(call as-instr,.arch_extension sec,+sec)
>  AFLAGS_bcm_kona_smc_asm.o	:=-Wa,-march=armv7-a$(plus_sec)
> +obj-$(CONFIG_ARCH_BCM5301X)	+= bcm5301x.o
> diff --git a/arch/arm/mach-bcm/bcm5301x.c b/arch/arm/mach-bcm/bcm5301x.c
> new file mode 100644
> index 0000000..5168f94
> --- /dev/null
> +++ b/arch/arm/mach-bcm/bcm5301x.c
> @@ -0,0 +1,59 @@
> +/*
> + * Broadcom BCM470X / BCM5301X ARM platform code.
> + *
> + * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/irqchip.h>

not needed

> +#include <linux/clocksource.h>
> +#include <linux/clk-provider.h>
> +
> +#include <asm/mach/arch.h>
> +#include <asm/mach/map.h>
> +#include <asm/signal.h>
> +
> +static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
> +				 struct pt_regs *regs)
> +{
> +	/*
> +	 * These happen for no good reason, possibly left over from CFE
> +	 */
> +	pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
> +		addr, fsr);
> +
> +	/* Returning non-zero causes fault display and panic */
> +	return 0;
> +}
> +
> +static void __init bcm5301x_init_early(void)
> +{
> +	/* Install our hook */
> +	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, 0,
> +			"imprecise external abort");
> +}
> +
> +static void __init bcm5301x_map_io(void)
> +{
> +	debug_ll_io_init();
> +}

not needed, debug_ll_io_init() is already invoked when .map_io is not set
in the descriptor below.

> +
> +static void __init bcm5301x_timer_init(void)
> +{
> +	of_clk_init(NULL);
> +	clocksource_of_init();
> +}
> +
> +static const char const *bcm5301x_dt_compat[] = {

missing a __initconst

> +	"brcm,bcm4708",
> +	NULL,
> +};
> +
> +DT_MACHINE_START(BCM5301X, "BCM5301X")
> +	.init_early = bcm5301x_init_early,
> +	.map_io = bcm5301x_map_io,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^

> +	.init_time = bcm5301x_timer_init,
> +	.dt_compat = bcm5301x_dt_compat,
> +MACHINE_END
> -- 
> 1.7.10.4

[PATCH v3 3/3] ARM: BCM5301X: add dts files for BCM4708 SoC

[Domenico Andreoli]

On Fri, Jul 26, 2013 at 12:42:15AM +0200, Hauke Mehrtens wrote:
> This uses the newly added BCM5301X SoC code.
> 
> Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
> ---
>  arch/arm/boot/dts/Makefile                  |    1 +
>  arch/arm/boot/dts/bcm4708-netgear-r6250.dts |   20 ++++++++
>  arch/arm/boot/dts/bcm4708.dtsi              |   74 +++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+)
>  create mode 100644 arch/arm/boot/dts/bcm4708-netgear-r6250.dts
>  create mode 100644 arch/arm/boot/dts/bcm4708.dtsi
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 641b3c9..6329f2d 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -43,6 +43,7 @@ dtb-$(CONFIG_ARCH_AT91)	+= sama5d35ek.dtb
>  
>  dtb-$(CONFIG_ARCH_BCM2835) += bcm2835-rpi-b.dtb
>  dtb-$(CONFIG_ARCH_BCM) += bcm11351-brt.dtb
> +dtb-$(CONFIG_ARCH_BCM5301X) += bcm4708-netgear-r6250.dtb
>  dtb-$(CONFIG_ARCH_DAVINCI) += da850-enbw-cmc.dtb \
>  	da850-evm.dtb
>  dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
> diff --git a/arch/arm/boot/dts/bcm4708-netgear-r6250.dts b/arch/arm/boot/dts/bcm4708-netgear-r6250.dts
> new file mode 100644
> index 0000000..34875f6
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm4708-netgear-r6250.dts
> @@ -0,0 +1,20 @@
> +/*
> + * Broadcom BCM470X / BCM5301X arm platform code.
> + *
> + * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +/dts-v1/;
> +
> +#include "bcm4708.dtsi"
> +
> +/ {
> +	compatible = "netgear,r6250v1", "brcm,bcm4708";
> +	model = "Netgear R6250 V1 (BCM4708)";
> +
> +	memory {
> +		reg = <0x00000000 0x08000000>;
> +	};
> +};
> diff --git a/arch/arm/boot/dts/bcm4708.dtsi b/arch/arm/boot/dts/bcm4708.dtsi
> new file mode 100644
> index 0000000..fbf1dcf
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm4708.dtsi
> @@ -0,0 +1,74 @@
> +/*
> + * Broadcom BCM470X / BCM5301X ARM platform code.
> + *
> + * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +#include "skeleton.dtsi"
> +
> +/ {
> +	compatible = "brcm,bcm4708";
> +	model = "Broadcom BCM4708";
> +	interrupt-parent = <&gic>;
> +
> +	chosen {
> +		bootargs = "console=ttyS0,115200 earlyprintk debug";

don't know if "earlyprintk debug" is appropriate here

> +	};
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu at 0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a9";
> +			reg = <0>;
> +		};
> +	};
> +
> +	clocks {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		clk_periph: periph {
> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +			clock-frequency = <400000000>;
> +		};
> +	};
> +
> +	uart at 18000300 {
> +		compatible = "ns16550";
> +		reg = <0x18000300 0x100>;
> +		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> +		clock-frequency = <100000000>;
> +	};
> +
> +	uart at 18000400 {
> +		compatible = "ns16550";
> +		reg = <0x18000400 0x100>;
> +		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> +		clock-frequency = <100000000>;
> +	};
> +
> +	gic: interrupt-controller at 19021000 {
> +		compatible = "arm,cortex-a9-gic";
> +		#interrupt-cells = <3>;
> +		#address-cells = <0>;
> +		interrupt-controller;
> +		reg = <0x19021000 0x1000>,
> +		      <0x19020100 0x100>;
> +	};
> +
> +	timer at 19020200 {
> +		compatible = "arm,cortex-a9-global-timer";
> +		reg = <0x19020200 0x100>;
> +		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&clk_periph>;
> +	};
> +};
> -- 
> 1.7.10.4

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Will Deacon]

On Thu, Jul 25, 2013 at 11:42:13PM +0100, Hauke Mehrtens wrote:
> This patch adds support for the BCM5301X/BCM470X SoCs with an ARM CPUs.
> Currently just booting to a shell is working and nothing else, no
> Ethernet, wifi, flash, ...
> 
> This SoC is used in small office and home router with Broadcom SoCs.
> This code should support the BCM4707, BCM4708, BCM4709, BCM53010,
> BCM53011 and BCM53012 SoC. It uses one or two ARM Cortex A9
> Cores, some highlights are 2 PCIe 2.0 controllers, 4 Gigabit Ethernet
> MACs and a USB 3.0 host controller.
> 
> This SoC uses a dual core CPU, but this is currently not implemented.
> More information about this SoC can be found here:
> http://www.anandtech.com/show/5925/broadcom-announces-bcm4708x-and-bcm5301x-socs-for-80211ac-routers

[...]

> +static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
> +				 struct pt_regs *regs)
> +{
> +	/*
> +	 * These happen for no good reason, possibly left over from CFE
> +	 */
> +	pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
> +		addr, fsr);
> +
> +	/* Returning non-zero causes fault display and panic */
> +	return 0;
> +}
> +
> +static void __init bcm5301x_init_early(void)
> +{
> +	/* Install our hook */
> +	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, 0,
> +			"imprecise external abort");
> +}

Surely you can't be serious?

At least, we need a pretty good explanation of what *exactly* is causing
these spurious aborts before we start ignoring them unconditionally like
this. You're effectively masking an extremely serious error indicator with
this change.

Cheers,

Will

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Hauke Mehrtens]

On 07/26/2013 10:55 AM, Will Deacon wrote:
> On Thu, Jul 25, 2013 at 11:42:13PM +0100, Hauke Mehrtens wrote:
>> This patch adds support for the BCM5301X/BCM470X SoCs with an ARM CPUs.
>> Currently just booting to a shell is working and nothing else, no
>> Ethernet, wifi, flash, ...
>>
>> This SoC is used in small office and home router with Broadcom SoCs.
>> This code should support the BCM4707, BCM4708, BCM4709, BCM53010,
>> BCM53011 and BCM53012 SoC. It uses one or two ARM Cortex A9
>> Cores, some highlights are 2 PCIe 2.0 controllers, 4 Gigabit Ethernet
>> MACs and a USB 3.0 host controller.
>>
>> This SoC uses a dual core CPU, but this is currently not implemented.
>> More information about this SoC can be found here:
>> http://www.anandtech.com/show/5925/broadcom-announces-bcm4708x-and-bcm5301x-socs-for-80211ac-routers
> 
> [...]
> 
>> +static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
>> +				 struct pt_regs *regs)
>> +{
>> +	/*
>> +	 * These happen for no good reason, possibly left over from CFE
>> +	 */
>> +	pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
>> +		addr, fsr);
>> +
>> +	/* Returning non-zero causes fault display and panic */
>> +	return 0;
>> +}
>> +
>> +static void __init bcm5301x_init_early(void)
>> +{
>> +	/* Install our hook */
>> +	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, 0,
>> +			"imprecise external abort");
>> +}
> 
> Surely you can't be serious?
> 
> At least, we need a pretty good explanation of what *exactly* is causing
> these spurious aborts before we start ignoring them unconditionally like
> this. You're effectively masking an extremely serious error indicator with
> this change.

This fault occurs once every boot sometime early in the boot process,
but the actual time this happens varies randomly.

Sadly I do not understand this completely, and I copied this from the
vendor BSP with the corresponding code documentation. They think CFE
(Common Firmware Environment, the bootloader used on these devices), did
something wrong, but I do not have the actual source of CFE and I do not
have the chip documentation. This occurs just once as far as I have seen
this, we could just catch the first one. Changing the boot loader is
also not an option, because I want to use this code on devices already
shipped to costumers and I do not have access to the boot loader source
code.

Do you know what this fault normally indicates?


Hauke

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Will Deacon]

On Fri, Jul 26, 2013 at 03:39:28PM +0100, Hauke Mehrtens wrote:
> On 07/26/2013 10:55 AM, Will Deacon wrote:
> >> +static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
> >> +				 struct pt_regs *regs)
> >> +{
> >> +	/*
> >> +	 * These happen for no good reason, possibly left over from CFE
> >> +	 */
> >> +	pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
> >> +		addr, fsr);
> >> +
> >> +	/* Returning non-zero causes fault display and panic */
> >> +	return 0;
> >> +}
> >> +
> >> +static void __init bcm5301x_init_early(void)
> >> +{
> >> +	/* Install our hook */
> >> +	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, 0,
> >> +			"imprecise external abort");
> >> +}
> > 
> > Surely you can't be serious?
> > 
> > At least, we need a pretty good explanation of what *exactly* is causing
> > these spurious aborts before we start ignoring them unconditionally like
> > this. You're effectively masking an extremely serious error indicator with
> > this change.
> 
> This fault occurs once every boot sometime early in the boot process,
> but the actual time this happens varies randomly.

Well that's interesting in itself. It sounds like we don't know *for sure*
whether the abort is triggered by Linux. Since the abort is imprecise, the
timing will vary.

> Sadly I do not understand this completely, and I copied this from the
> vendor BSP with the corresponding code documentation. They think CFE
> (Common Firmware Environment, the bootloader used on these devices), did
> something wrong, but I do not have the actual source of CFE and I do not
> have the chip documentation. This occurs just once as far as I have seen
> this, we could just catch the first one. Changing the boot loader is
> also not an option, because I want to use this code on devices already
> shipped to costumers and I do not have access to the boot loader source
> code.

Can somebody with hardware debug capability help you out (I notice csd is on
CC...)? We can have the hack if we know why it's needed, but as it stands it
could easily be hiding other problems.

> Do you know what this fault normally indicates?

Usually that something went horribly wrong in the memory subsystem at some
point in the past (i.e. invalid requests stuck on the bus, to which nobody
replied). You can sometimes get these if you try to probe for
non-discoverable devices by poking around in the physical memory map.

Will

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Arnd Bergmann]

On Friday 26 July 2013, Will Deacon wrote:
> > > At least, we need a pretty good explanation of what exactly is causing
> > > these spurious aborts before we start ignoring them unconditionally like
> > > this. You're effectively masking an extremely serious error indicator with
> > > this change.
> > 
> > This fault occurs once every boot sometime early in the boot process,
> > but the actual time this happens varies randomly.
> 
> Well that's interesting in itself. It sounds like we don't know *for sure*
> whether the abort is triggered by Linux. Since the abort is imprecise, the
> timing will vary.

It might be possible to find out the culprit if you just enter an endless loop
in the early kernel boot code. If you enter the loop before Linux does something
wrong, it won't crash, otherwise it will. After that, you could bisect the
boot process by moving the busy loop around.

If it even crashes at the point where Linux gets entered, it's a bug in the
boot loader.

	Arnd

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Will Deacon]

On Sat, Jul 27, 2013 at 08:49:16PM +0100, Arnd Bergmann wrote:
> On Friday 26 July 2013, Will Deacon wrote:
> > > > At least, we need a pretty good explanation of what exactly is causing
> > > > these spurious aborts before we start ignoring them unconditionally like
> > > > this. You're effectively masking an extremely serious error indicator with
> > > > this change.
> > > 
> > > This fault occurs once every boot sometime early in the boot process,
> > > but the actual time this happens varies randomly.
> > 
> > Well that's interesting in itself. It sounds like we don't know *for sure*
> > whether the abort is triggered by Linux. Since the abort is imprecise, the
> > timing will vary.
> 
> It might be possible to find out the culprit if you just enter an endless loop
> in the early kernel boot code. If you enter the loop before Linux does something
> wrong, it won't crash, otherwise it will. After that, you could bisect the
> boot process by moving the busy loop around.
> 
> If it even crashes at the point where Linux gets entered, it's a bug in the
> boot loader.

Can you give Arnd's suggestion a go please Hauke?

Thanks,

Will

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Hauke Mehrtens]

On 07/30/2013 03:36 PM, Will Deacon wrote:
> On Sat, Jul 27, 2013 at 08:49:16PM +0100, Arnd Bergmann wrote:
>> On Friday 26 July 2013, Will Deacon wrote:
>>>>> At least, we need a pretty good explanation of what exactly is causing
>>>>> these spurious aborts before we start ignoring them unconditionally like
>>>>> this. You're effectively masking an extremely serious error indicator with
>>>>> this change.
>>>>
>>>> This fault occurs once every boot sometime early in the boot process,
>>>> but the actual time this happens varies randomly.
>>>
>>> Well that's interesting in itself. It sounds like we don't know *for sure*
>>> whether the abort is triggered by Linux. Since the abort is imprecise, the
>>> timing will vary.
>>
>> It might be possible to find out the culprit if you just enter an endless loop
>> in the early kernel boot code. If you enter the loop before Linux does something
>> wrong, it won't crash, otherwise it will. After that, you could bisect the
>> boot process by moving the busy loop around.
>>
>> If it even crashes at the point where Linux gets entered, it's a bug in the
>> boot loader.
> 
> Can you give Arnd's suggestion a go please Hauke?

Hi

I just tried that, but it did not crash in the loop. :-(

Now, with 3.11-rc3 it crashed reproducible after Freeing unused kernel
memory, see this:

[    0.859198] Freeing unused kernel memory: 1124K (c0260000 - c0379000)
[    0.866298] Unhandled fault: imprecise external abort (0x1c06) at
0xb6f8b005
[    0.873538] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000007

Do you have some more informations about this type of error?

Hauke

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Will Deacon]

On Tue, Jul 30, 2013 at 09:54:04PM +0100, Hauke Mehrtens wrote:
> On 07/30/2013 03:36 PM, Will Deacon wrote:
> > On Sat, Jul 27, 2013 at 08:49:16PM +0100, Arnd Bergmann wrote:
> >> On Friday 26 July 2013, Will Deacon wrote:
> >>>>> At least, we need a pretty good explanation of what exactly is causing
> >>>>> these spurious aborts before we start ignoring them unconditionally like
> >>>>> this. You're effectively masking an extremely serious error indicator with
> >>>>> this change.
> >>>>
> >>>> This fault occurs once every boot sometime early in the boot process,
> >>>> but the actual time this happens varies randomly.
> >>>
> >>> Well that's interesting in itself. It sounds like we don't know *for sure*
> >>> whether the abort is triggered by Linux. Since the abort is imprecise, the
> >>> timing will vary.
> >>
> >> It might be possible to find out the culprit if you just enter an endless loop
> >> in the early kernel boot code. If you enter the loop before Linux does something
> >> wrong, it won't crash, otherwise it will. After that, you could bisect the
> >> boot process by moving the busy loop around.
> >>
> >> If it even crashes at the point where Linux gets entered, it's a bug in the
> >> boot loader.
> > 
> > Can you give Arnd's suggestion a go please Hauke?
> 
> Hi
> 
> I just tried that, but it did not crash in the loop. :-(

Turn that frown around -- this is a useful result! It means that the abort
is likely caused by the kernel, rather than the boot loader (although we
still can't rule it out, it depends where you put the loop).

> Now, with 3.11-rc3 it crashed reproducible after Freeing unused kernel
> memory, see this:
> 
> [    0.859198] Freeing unused kernel memory: 1124K (c0260000 - c0379000)
> [    0.866298] Unhandled fault: imprecise external abort (0x1c06) at
> 0xb6f8b005
> [    0.873538] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007
> 
> Do you have some more informations about this type of error?

Hmm, so that's now exploding on a user address. Is this an A9-based SoC? If
so, can you try disabling PL310 (CONFIG_CACHE_L2X0) and see if it makes a
different please?

Cheers,

Will

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Hauke Mehrtens]

On 07/31/2013 12:35 PM, Will Deacon wrote:
> On Tue, Jul 30, 2013 at 09:54:04PM +0100, Hauke Mehrtens wrote:
>> On 07/30/2013 03:36 PM, Will Deacon wrote:
>>> On Sat, Jul 27, 2013 at 08:49:16PM +0100, Arnd Bergmann wrote:
>>>> On Friday 26 July 2013, Will Deacon wrote:
>>>>>>> At least, we need a pretty good explanation of what exactly is causing
>>>>>>> these spurious aborts before we start ignoring them unconditionally like
>>>>>>> this. You're effectively masking an extremely serious error indicator with
>>>>>>> this change.
>>>>>>
>>>>>> This fault occurs once every boot sometime early in the boot process,
>>>>>> but the actual time this happens varies randomly.
>>>>>
>>>>> Well that's interesting in itself. It sounds like we don't know *for sure*
>>>>> whether the abort is triggered by Linux. Since the abort is imprecise, the
>>>>> timing will vary.
>>>>
>>>> It might be possible to find out the culprit if you just enter an endless loop
>>>> in the early kernel boot code. If you enter the loop before Linux does something
>>>> wrong, it won't crash, otherwise it will. After that, you could bisect the
>>>> boot process by moving the busy loop around.
>>>>
>>>> If it even crashes at the point where Linux gets entered, it's a bug in the
>>>> boot loader.
>>>
>>> Can you give Arnd's suggestion a go please Hauke?
>>
>> Hi
>>
>> I just tried that, but it did not crash in the loop. :-(
> 
> Turn that frown around -- this is a useful result! It means that the abort
> is likely caused by the kernel, rather than the boot loader (although we
> still can't rule it out, it depends where you put the loop).
> 
>> Now, with 3.11-rc3 it crashed reproducible after Freeing unused kernel
>> memory, see this:
>>
>> [    0.859198] Freeing unused kernel memory: 1124K (c0260000 - c0379000)
>> [    0.866298] Unhandled fault: imprecise external abort (0x1c06) at
>> 0xb6f8b005
>> [    0.873538] Kernel panic - not syncing: Attempted to kill init!
>> exitcode=0x00000007
>>
>> Do you have some more informations about this type of error?
> 
> Hmm, so that's now exploding on a user address. Is this an A9-based SoC? If
> so, can you try disabling PL310 (CONFIG_CACHE_L2X0) and see if it makes a
> different please?

This is a A9-based SoC.

I already had PL310 disabled, now I tried to activate it, but I do not
see any difference.

[    1.049381] Freeing unused kernel memory: 1128K (c0261000 - c037b000)
[    1.056501] Unhandled fault: imprecise external abort (0x1c06) at
0xb6f34005
[    1.063738] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000007

Hauke

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Will Deacon]

On Thu, Aug 01, 2013 at 10:51:06PM +0100, Hauke Mehrtens wrote:
> On 07/31/2013 12:35 PM, Will Deacon wrote:
> > Hmm, so that's now exploding on a user address. Is this an A9-based SoC? If
> > so, can you try disabling PL310 (CONFIG_CACHE_L2X0) and see if it makes a
> > different please?
> 
> This is a A9-based SoC.
> 
> I already had PL310 disabled, now I tried to activate it, but I do not
> see any difference.
> 
> [    1.049381] Freeing unused kernel memory: 1128K (c0261000 - c037b000)
> [    1.056501] Unhandled fault: imprecise external abort (0x1c06) at
> 0xb6f34005
> [    1.063738] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007

Ok, in which case I think you need to try Arnd's other suggestion of moving
the loop around in order to try and bisect where the fault is being
generated.

Will

[PATCH v3 1/3] ARM: BCM5301X: initial support for the BCM5301X/BCM470X SoCs with ARM CPU

[Afzal Mohammed]

Hi Hauke,

On Wednesday 31 July 2013 02:24 AM, Hauke Mehrtens wrote:

> Now, with 3.11-rc3 it crashed reproducible after Freeing unused kernel
> memory, see this:
>
> [    0.859198] Freeing unused kernel memory: 1124K (c0260000 - c0379000)
> [    0.866298] Unhandled fault: imprecise external abort (0x1c06) at
> 0xb6f8b005
> [    0.873538] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007
>
> Do you have some more informations about this type of error?

If upon entry to kernel, CPSR.A is '1', change it '0' (enable 
asynchronous abort) and see if it makes the abort more precise.

Regards
Afzal