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From: Paul Mackerras <paulus@ozlabs.org>
To: linuxppc-dev@ozlabs.org
Subject: [PATCH 10/11] powerpc/microwatt: Add a boot wrapper for Microwatt
Date: Tue, 15 Jun 2021 09:03:25 +1000	[thread overview]
Message-ID: <YMfgPQfUkFBzcg1x@thinks.paulus.ozlabs.org> (raw)
In-Reply-To: <YMfeswgEHeXSLOUF@thinks.paulus.ozlabs.org>

From: Joel Stanley <joel@jms.id.au>

This allows microwatt's kernel to be built with an embedded device tree.

Load to arch/powerpc/boot/dtbImage.microwatt to 0x500000:

 mw_debug -b fpga stop load arch/powerpc/boot/dtbImage.microwatt 500000 start

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 arch/powerpc/boot/Makefile    |  4 ++++
 arch/powerpc/boot/microwatt.c | 18 ++++++++++++++++++
 arch/powerpc/boot/wrapper     |  5 +++++
 3 files changed, 27 insertions(+)
 create mode 100644 arch/powerpc/boot/microwatt.c

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 2b8da923ceca..dfaa4094fcae 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -163,6 +163,8 @@ src-plat-$(CONFIG_PPC_POWERNV) += pseries-head.S
 src-plat-$(CONFIG_PPC_IBM_CELL_BLADE) += pseries-head.S
 src-plat-$(CONFIG_MVME7100) += motload-head.S mvme7100.c
 
+src-plat-$(CONFIG_PPC_MICROWATT) += fixed-head.S microwatt.c
+
 src-wlib := $(sort $(src-wlib-y))
 src-plat := $(sort $(src-plat-y))
 src-boot := $(src-wlib) $(src-plat) empty.c
@@ -355,6 +357,8 @@ image-$(CONFIG_MVME5100)		+= dtbImage.mvme5100
 # Board port in arch/powerpc/platform/amigaone/Kconfig
 image-$(CONFIG_AMIGAONE)		+= cuImage.amigaone
 
+image-$(CONFIG_PPC_MICROWATT)		+= dtbImage.microwatt
+
 # For 32-bit powermacs, build the COFF and miboot images
 # as well as the ELF images.
 ifdef CONFIG_PPC32
diff --git a/arch/powerpc/boot/microwatt.c b/arch/powerpc/boot/microwatt.c
new file mode 100644
index 000000000000..ac922dd0aa4d
--- /dev/null
+++ b/arch/powerpc/boot/microwatt.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <stddef.h>
+#include "stdio.h"
+#include "types.h"
+#include "io.h"
+#include "ops.h"
+
+BSS_STACK(8192);
+
+void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
+{
+	unsigned long heapsize = 16*1024*1024 - (unsigned long)_end;
+
+	simple_alloc_init(_end, heapsize, 32, 64);
+	fdt_init(_dtb_start);
+	serial_console_init();
+}
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index 41fa0a8715e3..ae48fffa1e13 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -342,6 +342,11 @@ gamecube|wii)
     link_address='0x600000'
     platformo="$object/$platform-head.o $object/$platform.o"
     ;;
+microwatt)
+    link_address='0x500000'
+    platformo="$object/fixed-head.o $object/$platform.o"
+    binary=y
+    ;;
 treeboot-currituck)
     link_address='0x1000000'
     ;;
-- 
2.31.1


  parent reply	other threads:[~2021-06-14 23:06 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 22:56 [PATCH 00/11] powerpc: Add support for Microwatt soft-core Paul Mackerras
2021-06-14 22:57 ` [PATCH 01/11] powerpc: Add Microwatt platform Paul Mackerras
2021-06-16 18:40   ` Segher Boessenkool
2021-06-16 22:24     ` Paul Mackerras
2021-06-14 22:58 ` [PATCH 02/11] powerpc: Add Microwatt device tree Paul Mackerras
2021-06-17  4:41   ` Michael Ellerman
2021-06-18  2:58     ` Paul Mackerras
2021-06-14 22:59 ` [PATCH 03/11] powerpc/radix: Add support for microwatt's PRTBL SPR Paul Mackerras
2021-06-15  1:12   ` Nicholas Piggin
2021-06-14 23:00 ` [PATCH 04/11] powerpc/microwatt: Populate platform bus from device-tree Paul Mackerras
2021-06-14 23:00 ` [PATCH 05/11] powerpc/xics: Add a native ICS backend for microwatt Paul Mackerras
2021-06-14 23:01 ` [PATCH 06/11] powerpc: microwatt: Use standard 16550 UART for console Paul Mackerras
2021-06-16 20:42   ` Segher Boessenkool
2021-06-14 23:02 ` [PATCH 07/11] powerpc: Add support for microwatt's hardware random number generator Paul Mackerras
2021-06-15  1:40   ` Nicholas Piggin
2021-06-16 13:16     ` Michael Ellerman
2021-06-16 22:22       ` Paul Mackerras
2021-06-14 23:02 ` [PATCH 08/11] powerpc/microwatt: Add microwatt_defconfig Paul Mackerras
2021-06-14 23:03 ` Paul Mackerras [this message]
2021-06-14 23:04 ` [PATCH 09/11] powerpc: boot: Fixup device-tree on little endian Paul Mackerras
2021-06-14 23:05 ` [PATCH 11/11] powerpc/microwatt: Disable interrupts in boot wrapper main program Paul Mackerras
2021-06-15  1:21   ` Nicholas Piggin
2021-06-16 23:37   ` Segher Boessenkool
2021-06-17  1:40     ` Nicholas Piggin
2021-06-17  4:06       ` Michael Ellerman
2021-06-17 16:54       ` Segher Boessenkool

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