[RFC] ARM: add multi_v7_lpae_defconfig

[RFC] ARM: add multi_v7_lpae_defconfig

[Nicolas Saenz Julienne]

The only missing configuration option preventing us from using
multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
controller found on the SoC depends on 64bit addressing, yet can't be
included as not all v7 boards support LPAE.

Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
avoid us having to duplicate and maintain multiple similar configurations.

Note that merge_into_defconfig was taken from arch/powerpc/Makefile.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/Makefile            | 14 ++++++++++++++
 arch/arm/configs/lpae.config |  1 +
 2 files changed, 15 insertions(+)
 create mode 100644 arch/arm/configs/lpae.config

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index db857d07114f..3d157777a465 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -356,6 +356,20 @@ archclean:
 # My testing targets (bypasses dependencies)
 bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/bootpImage
 
+# Used to create 'merged defconfigs'
+# To use it $(call) it with the first argument as the base defconfig
+# and the second argument as a space separated list of .config files to merge,
+# without the .config suffix.
+define merge_into_defconfig
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
+		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
+		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
+	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
+endef
+
+PHONY += multi_v7_lpae_defconfig
+multi_v7_lpae_defconfig:
+	$(call merge_into_defconfig,multi_v7_defconfig,lpae)
 
 define archhelp
   echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
new file mode 100644
index 000000000000..19bab134e014
--- /dev/null
+++ b/arch/arm/configs/lpae.config
@@ -0,0 +1 @@
+CONFIG_ARM_LPAE=y
-- 
2.24.1

[RFC] ARM: add multi_v7_lpae_defconfig

[Nicolas Saenz Julienne]

The only missing configuration option preventing us from using
multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
controller found on the SoC depends on 64bit addressing, yet can't be
included as not all v7 boards support LPAE.

Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
avoid us having to duplicate and maintain multiple similar configurations.

Note that merge_into_defconfig was taken from arch/powerpc/Makefile.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/Makefile            | 14 ++++++++++++++
 arch/arm/configs/lpae.config |  1 +
 2 files changed, 15 insertions(+)
 create mode 100644 arch/arm/configs/lpae.config

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index db857d07114f..3d157777a465 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -356,6 +356,20 @@ archclean:
 # My testing targets (bypasses dependencies)
 bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/bootpImage
 
+# Used to create 'merged defconfigs'
+# To use it $(call) it with the first argument as the base defconfig
+# and the second argument as a space separated list of .config files to merge,
+# without the .config suffix.
+define merge_into_defconfig
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
+		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
+		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
+	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
+endef
+
+PHONY += multi_v7_lpae_defconfig
+multi_v7_lpae_defconfig:
+	$(call merge_into_defconfig,multi_v7_defconfig,lpae)
 
 define archhelp
   echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
new file mode 100644
index 000000000000..19bab134e014
--- /dev/null
+++ b/arch/arm/configs/lpae.config
@@ -0,0 +1 @@
+CONFIG_ARM_LPAE=y
-- 
2.24.1


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Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Florian Fainelli]

On 1/10/20 9:34 AM, Nicolas Saenz Julienne wrote:
> The only missing configuration option preventing us from using
> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
> controller found on the SoC depends on 64bit addressing, yet can't be
> included as not all v7 boards support LPAE.

You might still be able to map the PCIe space above 4GB by using a super
section though I am not sure how easy that would be to do with
__map_init_section for instance and for the 4GB Pi4, we would not be
able to address the entire DRAM space anyway.

Besides, having a LPAE variant of the multi_v7_defconfig has a lot of
value given that there are a few ARMv7 platforms that support LPAE.

> 
> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
> avoid us having to duplicate and maintain multiple similar configurations.
> 
> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.

Would it make sense to move that make macro to scripts and keep just the
multi_v7_lape_defconfig make target under arch/arm/Makefile?

> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> ---
>  arch/arm/Makefile            | 14 ++++++++++++++
>  arch/arm/configs/lpae.config |  1 +
>  2 files changed, 15 insertions(+)
>  create mode 100644 arch/arm/configs/lpae.config
> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index db857d07114f..3d157777a465 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -356,6 +356,20 @@ archclean:
>  # My testing targets (bypasses dependencies)
>  bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/bootpImage
>  
> +# Used to create 'merged defconfigs'
> +# To use it $(call) it with the first argument as the base defconfig
> +# and the second argument as a space separated list of .config files to merge,
> +# without the .config suffix.
> +define merge_into_defconfig
> +	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
> +		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
> +		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
> +	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
> +endef
> +
> +PHONY += multi_v7_lpae_defconfig
> +multi_v7_lpae_defconfig:
> +	$(call merge_into_defconfig,multi_v7_defconfig,lpae)
>  
>  define archhelp
>    echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
> diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
> new file mode 100644
> index 000000000000..19bab134e014
> --- /dev/null
> +++ b/arch/arm/configs/lpae.config
> @@ -0,0 +1 @@
> +CONFIG_ARM_LPAE=y
> 


-- 
Florian

Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Florian Fainelli]

On 1/10/20 9:34 AM, Nicolas Saenz Julienne wrote:
> The only missing configuration option preventing us from using
> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
> controller found on the SoC depends on 64bit addressing, yet can't be
> included as not all v7 boards support LPAE.

You might still be able to map the PCIe space above 4GB by using a super
section though I am not sure how easy that would be to do with
__map_init_section for instance and for the 4GB Pi4, we would not be
able to address the entire DRAM space anyway.

Besides, having a LPAE variant of the multi_v7_defconfig has a lot of
value given that there are a few ARMv7 platforms that support LPAE.

> 
> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
> avoid us having to duplicate and maintain multiple similar configurations.
> 
> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.

Would it make sense to move that make macro to scripts and keep just the
multi_v7_lape_defconfig make target under arch/arm/Makefile?

> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> ---
>  arch/arm/Makefile            | 14 ++++++++++++++
>  arch/arm/configs/lpae.config |  1 +
>  2 files changed, 15 insertions(+)
>  create mode 100644 arch/arm/configs/lpae.config
> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index db857d07114f..3d157777a465 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -356,6 +356,20 @@ archclean:
>  # My testing targets (bypasses dependencies)
>  bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/bootpImage
>  
> +# Used to create 'merged defconfigs'
> +# To use it $(call) it with the first argument as the base defconfig
> +# and the second argument as a space separated list of .config files to merge,
> +# without the .config suffix.
> +define merge_into_defconfig
> +	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
> +		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
> +		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
> +	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
> +endef
> +
> +PHONY += multi_v7_lpae_defconfig
> +multi_v7_lpae_defconfig:
> +	$(call merge_into_defconfig,multi_v7_defconfig,lpae)
>  
>  define archhelp
>    echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
> diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
> new file mode 100644
> index 000000000000..19bab134e014
> --- /dev/null
> +++ b/arch/arm/configs/lpae.config
> @@ -0,0 +1 @@
> +CONFIG_ARM_LPAE=y
> 


-- 
Florian

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Arnd Bergmann]

On Fri, Jan 10, 2020 at 6:35 PM Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> The only missing configuration option preventing us from using
> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
> controller found on the SoC depends on 64bit addressing, yet can't be
> included as not all v7 boards support LPAE.
>
> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
> avoid us having to duplicate and maintain multiple similar configurations.
>
> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

I like the idea, but I would note that a lot of platforms enabled in
multi_v7_defconfig do not support LPAE. In particular, the first ARMv7
cores (Cortex-A8, -A9, -A5, and PJ4) don't, but the later ones (Cortex-A7,
-A15, -A17, and PJ4C-MP) do.

Here is a list from the defconfig file

CONFIG_ARCH_VIRT=y
CONFIG_ARCH_ALPINE=y
CONFIG_ARCH_ARTPEC=y
CONFIG_MACH_ARTPEC6=y

Artpec is A9

CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G6=y
CONFIG_ARCH_AT91=y
CONFIG_SOC_SAMA5D2=y
CONFIG_SOC_SAMA5D3=y
CONFIG_SOC_SAMA5D4=y

AT91/SAMA5 is A5

CONFIG_ARCH_BCM=y
CONFIG_ARCH_BCM_CYGNUS=y
CONFIG_ARCH_BCM_HR2=y
CONFIG_ARCH_BCM_NSP=y
CONFIG_ARCH_BCM_5301X=y
CONFIG_ARCH_BCM_281XX=y
CONFIG_ARCH_BCM_21664=y
CONFIG_ARCH_BCM_63XX=y
CONFIG_ARCH_BRCMSTB=y

I think most of the above are A9, but not sure

CONFIG_ARCH_BCM2835=y
CONFIG_ARCH_BERLIN=y
CONFIG_MACH_BERLIN_BG2CD=y
CONFIG_MACH_BERLIN_BG2Q=y
CONFIG_MACH_BERLIN_BG2=y

These are mixed, I think BG2CD is A7, but the older ones are A9 or PJ4

CONFIG_ARCH_DIGICOLOR=y

CX92755 is an A8

CONFIG_ARCH_EXYNOS=y

exynos is a mix of A9 and A15/A7, so this is fine

CONFIG_ARCH_HIGHBANK=y

A9 and A15, also fine

CONFIG_ARCH_HISI=y
CONFIG_ARCH_HI3xxx=y
CONFIG_ARCH_HIP01=y
CONFIG_ARCH_HIP04=y
CONFIG_ARCH_HIX5HD2=y
CONFIG_ARCH_MXC=y
CONFIG_SOC_IMX50=y
CONFIG_SOC_IMX51=y
CONFIG_SOC_IMX53=y

IMX5 is A8

CONFIG_SOC_IMX6Q=y
CONFIG_SOC_IMX6SL=y
CONFIG_SOC_IMX6SX=y

These older imx6 variants are A9, but the 6UL and 7D are A7.

CONFIG_SOC_IMX6UL=y
CONFIG_SOC_LS1021A=y
CONFIG_SOC_IMX7D=y
CONFIG_SOC_VF610=y

VF610 is an A5

CONFIG_ARCH_KEYSTONE=y
CONFIG_ARCH_MEDIATEK=y

Mediatek is mostly A7, but some A9

CONFIG_ARCH_MESON=y

Mixed

CONFIG_ARCH_MILBEAUT=y
CONFIG_ARCH_MILBEAUT_M10V=y
CONFIG_ARCH_MMP=y
CONFIG_MACH_MMP2_DT=y
CONFIG_MACH_MMP3_DT=y

MMP is a PJ4, I don't think there is LPAE, but not sure

CONFIG_ARCH_MVEBU=y
CONFIG_MACH_ARMADA_370=y
CONFIG_MACH_ARMADA_375=y
CONFIG_MACH_ARMADA_38X=y
CONFIG_MACH_ARMADA_39X=y
CONFIG_MACH_ARMADA_XP=y
CONFIG_MACH_DOVE=y

Fairly sure only Armada XP has LPAE out of these

CONFIG_ARCH_OMAP3=y
CONFIG_ARCH_OMAP4=y
CONFIG_SOC_OMAP5=y
CONFIG_SOC_AM33XX=y
CONFIG_SOC_AM43XX=y
CONFIG_SOC_DRA7XX=y

only OMAP5 and DRA7 use an A15, the others are A8 or A9

CONFIG_ARCH_SIRF=y
CONFIG_ARCH_QCOM=y
CONFIG_ARCH_MSM8X60=y
CONFIG_ARCH_MSM8960=y
CONFIG_ARCH_MSM8974=y

Not sure whether there is LPAE on Qualcomm's custom cores

CONFIG_ARCH_ROCKCHIP=y

Mixed

CONFIG_ARCH_RENESAS=y

Mixed

CONFIG_ARCH_SOCFPGA=y

A9 only

CONFIG_PLAT_SPEAR=y
CONFIG_ARCH_SPEAR13XX=y
CONFIG_MACH_SPEAR1310=y
CONFIG_MACH_SPEAR1340=y

A9 only

CONFIG_ARCH_STI=y
CONFIG_ARCH_STM32=y
CONFIG_ARCH_SUNXI=y

sunxi has A8 and A7 (and one that is A15+A7)

CONFIG_ARCH_TEGRA=y

Mixed

CONFIG_ARCH_UNIPHIER=y

 A9 only so far

CONFIG_ARCH_U8500=y

A9 only

CONFIG_ARCH_VEXPRESS=y

A9 or A15

CONFIG_ARCH_WM8850=y

A9

CONFIG_ARCH_ZYNQ=y

A9

I think it would make sense to either turn off the various A8/A9/A5 platforms
in the fragment, or add a CONFIG_ARCH_MULTI_V7VE option, and then
change the Kconfig dependencies so that the older platforms get turned off
when only V7 but not V7VE is set.

      Arnd

Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Arnd Bergmann]

On Fri, Jan 10, 2020 at 6:35 PM Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> The only missing configuration option preventing us from using
> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
> controller found on the SoC depends on 64bit addressing, yet can't be
> included as not all v7 boards support LPAE.
>
> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
> avoid us having to duplicate and maintain multiple similar configurations.
>
> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

I like the idea, but I would note that a lot of platforms enabled in
multi_v7_defconfig do not support LPAE. In particular, the first ARMv7
cores (Cortex-A8, -A9, -A5, and PJ4) don't, but the later ones (Cortex-A7,
-A15, -A17, and PJ4C-MP) do.

Here is a list from the defconfig file

CONFIG_ARCH_VIRT=y
CONFIG_ARCH_ALPINE=y
CONFIG_ARCH_ARTPEC=y
CONFIG_MACH_ARTPEC6=y

Artpec is A9

CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G6=y
CONFIG_ARCH_AT91=y
CONFIG_SOC_SAMA5D2=y
CONFIG_SOC_SAMA5D3=y
CONFIG_SOC_SAMA5D4=y

AT91/SAMA5 is A5

CONFIG_ARCH_BCM=y
CONFIG_ARCH_BCM_CYGNUS=y
CONFIG_ARCH_BCM_HR2=y
CONFIG_ARCH_BCM_NSP=y
CONFIG_ARCH_BCM_5301X=y
CONFIG_ARCH_BCM_281XX=y
CONFIG_ARCH_BCM_21664=y
CONFIG_ARCH_BCM_63XX=y
CONFIG_ARCH_BRCMSTB=y

I think most of the above are A9, but not sure

CONFIG_ARCH_BCM2835=y
CONFIG_ARCH_BERLIN=y
CONFIG_MACH_BERLIN_BG2CD=y
CONFIG_MACH_BERLIN_BG2Q=y
CONFIG_MACH_BERLIN_BG2=y

These are mixed, I think BG2CD is A7, but the older ones are A9 or PJ4

CONFIG_ARCH_DIGICOLOR=y

CX92755 is an A8

CONFIG_ARCH_EXYNOS=y

exynos is a mix of A9 and A15/A7, so this is fine

CONFIG_ARCH_HIGHBANK=y

A9 and A15, also fine

CONFIG_ARCH_HISI=y
CONFIG_ARCH_HI3xxx=y
CONFIG_ARCH_HIP01=y
CONFIG_ARCH_HIP04=y
CONFIG_ARCH_HIX5HD2=y
CONFIG_ARCH_MXC=y
CONFIG_SOC_IMX50=y
CONFIG_SOC_IMX51=y
CONFIG_SOC_IMX53=y

IMX5 is A8

CONFIG_SOC_IMX6Q=y
CONFIG_SOC_IMX6SL=y
CONFIG_SOC_IMX6SX=y

These older imx6 variants are A9, but the 6UL and 7D are A7.

CONFIG_SOC_IMX6UL=y
CONFIG_SOC_LS1021A=y
CONFIG_SOC_IMX7D=y
CONFIG_SOC_VF610=y

VF610 is an A5

CONFIG_ARCH_KEYSTONE=y
CONFIG_ARCH_MEDIATEK=y

Mediatek is mostly A7, but some A9

CONFIG_ARCH_MESON=y

Mixed

CONFIG_ARCH_MILBEAUT=y
CONFIG_ARCH_MILBEAUT_M10V=y
CONFIG_ARCH_MMP=y
CONFIG_MACH_MMP2_DT=y
CONFIG_MACH_MMP3_DT=y

MMP is a PJ4, I don't think there is LPAE, but not sure

CONFIG_ARCH_MVEBU=y
CONFIG_MACH_ARMADA_370=y
CONFIG_MACH_ARMADA_375=y
CONFIG_MACH_ARMADA_38X=y
CONFIG_MACH_ARMADA_39X=y
CONFIG_MACH_ARMADA_XP=y
CONFIG_MACH_DOVE=y

Fairly sure only Armada XP has LPAE out of these

CONFIG_ARCH_OMAP3=y
CONFIG_ARCH_OMAP4=y
CONFIG_SOC_OMAP5=y
CONFIG_SOC_AM33XX=y
CONFIG_SOC_AM43XX=y
CONFIG_SOC_DRA7XX=y

only OMAP5 and DRA7 use an A15, the others are A8 or A9

CONFIG_ARCH_SIRF=y
CONFIG_ARCH_QCOM=y
CONFIG_ARCH_MSM8X60=y
CONFIG_ARCH_MSM8960=y
CONFIG_ARCH_MSM8974=y

Not sure whether there is LPAE on Qualcomm's custom cores

CONFIG_ARCH_ROCKCHIP=y

Mixed

CONFIG_ARCH_RENESAS=y

Mixed

CONFIG_ARCH_SOCFPGA=y

A9 only

CONFIG_PLAT_SPEAR=y
CONFIG_ARCH_SPEAR13XX=y
CONFIG_MACH_SPEAR1310=y
CONFIG_MACH_SPEAR1340=y

A9 only

CONFIG_ARCH_STI=y
CONFIG_ARCH_STM32=y
CONFIG_ARCH_SUNXI=y

sunxi has A8 and A7 (and one that is A15+A7)

CONFIG_ARCH_TEGRA=y

Mixed

CONFIG_ARCH_UNIPHIER=y

 A9 only so far

CONFIG_ARCH_U8500=y

A9 only

CONFIG_ARCH_VEXPRESS=y

A9 or A15

CONFIG_ARCH_WM8850=y

A9

CONFIG_ARCH_ZYNQ=y

A9

I think it would make sense to either turn off the various A8/A9/A5 platforms
in the fragment, or add a CONFIG_ARCH_MULTI_V7VE option, and then
change the Kconfig dependencies so that the older platforms get turned off
when only V7 but not V7VE is set.

      Arnd

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Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Florian Fainelli]

On 2/12/20 12:19 PM, Arnd Bergmann wrote:
> On Fri, Jan 10, 2020 at 6:35 PM Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
>>
>> The only missing configuration option preventing us from using
>> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
>> controller found on the SoC depends on 64bit addressing, yet can't be
>> included as not all v7 boards support LPAE.
>>
>> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
>> avoid us having to duplicate and maintain multiple similar configurations.
>>
>> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.
>>
>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> 
> I like the idea, but I would note that a lot of platforms enabled in
> multi_v7_defconfig do not support LPAE. In particular, the first ARMv7
> cores (Cortex-A8, -A9, -A5, and PJ4) don't, but the later ones (Cortex-A7,
> -A15, -A17, and PJ4C-MP) do.
> 
> Here is a list from the defconfig file
> 

[snip]

> CONFIG_ARCH_BCM=y
> CONFIG_ARCH_BCM_CYGNUS=y
> CONFIG_ARCH_BCM_HR2=y
> CONFIG_ARCH_BCM_NSP=y
> CONFIG_ARCH_BCM_5301X=y
> CONFIG_ARCH_BCM_281XX=y
> CONFIG_ARCH_BCM_21664=y
> CONFIG_ARCH_BCM_63XX=y
> CONFIG_ARCH_BRCMSTB=y
> 
> I think most of the above are A9, but not sure

63138 is Cortex-A9, 63148 and BRCMSTB are using a Brahma-B15 CPU which
is LPAE capable. 23550 is A7 and every others are Cortex-A9.
-- 
Florian

Re: [RFC] ARM: add multi_v7_lpae_defconfig

[Florian Fainelli]

On 2/12/20 12:19 PM, Arnd Bergmann wrote:
> On Fri, Jan 10, 2020 at 6:35 PM Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
>>
>> The only missing configuration option preventing us from using
>> multi_v7_defconfig with the RPi4 is ARM_LPAE. It's needed as the PCIe
>> controller found on the SoC depends on 64bit addressing, yet can't be
>> included as not all v7 boards support LPAE.
>>
>> Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
>> avoid us having to duplicate and maintain multiple similar configurations.
>>
>> Note that merge_into_defconfig was taken from arch/powerpc/Makefile.
>>
>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> 
> I like the idea, but I would note that a lot of platforms enabled in
> multi_v7_defconfig do not support LPAE. In particular, the first ARMv7
> cores (Cortex-A8, -A9, -A5, and PJ4) don't, but the later ones (Cortex-A7,
> -A15, -A17, and PJ4C-MP) do.
> 
> Here is a list from the defconfig file
> 

[snip]

> CONFIG_ARCH_BCM=y
> CONFIG_ARCH_BCM_CYGNUS=y
> CONFIG_ARCH_BCM_HR2=y
> CONFIG_ARCH_BCM_NSP=y
> CONFIG_ARCH_BCM_5301X=y
> CONFIG_ARCH_BCM_281XX=y
> CONFIG_ARCH_BCM_21664=y
> CONFIG_ARCH_BCM_63XX=y
> CONFIG_ARCH_BRCMSTB=y
> 
> I think most of the above are A9, but not sure

63138 is Cortex-A9, 63148 and BRCMSTB are using a Brahma-B15 CPU which
is LPAE capable. 23550 is A7 and every others are Cortex-A9.
-- 
Florian

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