[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Heinrich Schuchardt]

Dear maintainers,

"Pull request for UEFI sub-system for efi-2020-01-rc4" disables the UEFI
sub-system for all boards except ARMv8, ARMv7, ARM11. This is necessary
as UEFI requires support for unaligned access. For ARM11 a function is
provided to switch unaligned access support on.

Tom suggested to disable UEFI by default on ARM11 to reduce the size of
the U-Boot binary. This would concern the following boards:

evb-ast2500_defconfig
flea3_defconfig
integratorcp_cm1136_defconfig
mx31pdk_defconfig
mx35pdk_defconfig
rpi_0_w_defconfig
rpi_defconfig
woodburn_defconfig
woodburn_sd_defconfig

At least the Raspberry boards should have no problem with UEFI enabled.

Do you see a necessity to use EFI_LOADER=n as default for any of the
boards in the list above?

Best regards

Heinrich

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Fabio Estevam]

Hi Heinrich,

On Tue, Nov 19, 2019 at 3:46 PM Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:

> mx31pdk_defconfig
> mx35pdk_defconfig

No problem on disabling UEFI for the mx31/mx35 boards.

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Heinrich Schuchardt]

On 11/19/19 8:17 PM, Fabio Estevam wrote:
> Hi Heinrich,
>
> On Tue, Nov 19, 2019 at 3:46 PM Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
>
>> mx31pdk_defconfig
>> mx35pdk_defconfig
>
> No problem on disabling UEFI for the mx31/mx35 boards.
>
Hello Fabio,

thanks for the swift reply.

https://git.kontron-electronics.de/linux/uboot-exceet/tree/2108f4c4a302a021a8807a7baac16dd680a8f3d0/board/freescale/mx35pdk
suggests to use as partition:

0x00000000-0x00080000 : "Bootloader"

If you are constrained to 512 KiB, disabling UEFI on the MX35PDK might
make sense.

On the MX31 we have OF_LIBFDT=n, so UEFI is not available anyway.

--

I tried to build mx35pdk_defconfig and mx35pdk_defconfig. I got an error

unrecognized -march target: armv5

Why is U-Boot built with -march=armv5 on ARM1136 and ARM1176 though they
are armv6?

arch/arm/Makefile:11:
arch-$(CONFIG_CPU_ARM1136)      =-march=armv5
arch-$(CONFIG_CPU_ARM1176)      =-march=armv5t

GCC 9.2.1 supports only the following armv5 and armv6 architectures:

armv5t armv5te armv5tej armv6 armv6j armv6k armv6z armv6kz armv6zk
armv6t2 armv6-m armv6s-m

So at least the ARM1136 entry should be corrected. Which value would you
suggest?

Best regards

Heinrich

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Fabio Estevam]

Hi Heinrich,

On Tue, Nov 19, 2019 at 5:38 PM Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:

> I tried to build mx35pdk_defconfig and mx35pdk_defconfig. I got an error
>
> unrecognized -march target: armv5
>
> Why is U-Boot built with -march=armv5 on ARM1136 and ARM1176 though they
> are armv6?
>
> arch/arm/Makefile:11:
> arch-$(CONFIG_CPU_ARM1136)      =-march=armv5
> arch-$(CONFIG_CPU_ARM1176)      =-march=armv5t
>
> GCC 9.2.1 supports only the following armv5 and armv6 architectures:
>
> armv5t armv5te armv5tej armv6 armv6j armv6k armv6z armv6kz armv6zk
> armv6t2 armv6-m armv6s-m
>
> So at least the ARM1136 entry should be corrected. Which value would you
> suggest?

Maybe the generic armv6 entry?

Thanks

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Maksym Sloyko]

On Tue, Nov 19, 2019 at 10:44 AM Heinrich Schuchardt <xypron.glpk@gmx.de>
wrote:

> Dear maintainers,
>
> "Pull request for UEFI sub-system for efi-2020-01-rc4" disables the UEFI
> sub-system for all boards except ARMv8, ARMv7, ARM11. This is necessary
> as UEFI requires support for unaligned access. For ARM11 a function is
> provided to switch unaligned access support on.
>
> Tom suggested to disable UEFI by default on ARM11 to reduce the size of
> the U-Boot binary. This would concern the following boards:
>
> evb-ast2500_defconfig
>

Sounds good to me for evb-ast2500


> flea3_defconfig
> integratorcp_cm1136_defconfig
> mx31pdk_defconfig
> mx35pdk_defconfig
> rpi_0_w_defconfig
> rpi_defconfig
> woodburn_defconfig
> woodburn_sd_defconfig
>
> At least the Raspberry boards should have no problem with UEFI enabled.
>
> Do you see a necessity to use EFI_LOADER=n as default for any of the
> boards in the list above?
>
> Best regards
>
> Heinrich
>

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Matthias Brugger]

On 19/11/2019 19:44, Heinrich Schuchardt wrote:
> Dear maintainers,
> 
> "Pull request for UEFI sub-system for efi-2020-01-rc4" disables the UEFI
> sub-system for all boards except ARMv8, ARMv7, ARM11. This is necessary
> as UEFI requires support for unaligned access. For ARM11 a function is
> provided to switch unaligned access support on.
> 
> Tom suggested to disable UEFI by default on ARM11 to reduce the size of
> the U-Boot binary. This would concern the following boards:
> 
> evb-ast2500_defconfig
> flea3_defconfig
> integratorcp_cm1136_defconfig
> mx31pdk_defconfig
> mx35pdk_defconfig
> rpi_0_w_defconfig
> rpi_defconfig
> woodburn_defconfig
> woodburn_sd_defconfig
> 
> At least the Raspberry boards should have no problem with UEFI enabled.
> 

So I'd prefer to have UEFI enabled on the RPi boards, so that we have one
consistent boot for all Raspberry Pi variants.

Regards,
Matthias

> Do you see a necessity to use EFI_LOADER=n as default for any of the
> boards in the list above?
> 
> Best regards
> 
> Heinrich

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Linus Walleij]

On Tue, Nov 19, 2019 at 7:44 PM Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:

> Tom suggested to disable UEFI by default on ARM11 to reduce the size of
> the U-Boot binary. This would concern the following boards:
(...)
> integratorcp_cm1136_defconfig

That's fine to go without UEFI.

Yours,
Linus Walleij

[U-Boot] Should UEFI be disabled on ARM11 boards by default?

[Mark Kettenis]

> X-Spam-Status: No, score=0.0 required=5.0 tests=FREEMAIL_FROM,T_DKIM_INVALID
> 	autolearn=unavailable autolearn_force=no version=3.4.0
> From: Heinrich Schuchardt <xypron.glpk@gmx.de>
> Date: Tue, 19 Nov 2019 19:44:47 +0100
> Content-Language: en-US
> Cc: U-Boot Mailing List <u-boot@lists.denx.de>,
>         Alexander Graf <agraf@csgraf.de>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> 
> Dear maintainers,
> 
> "Pull request for UEFI sub-system for efi-2020-01-rc4" disables the UEFI
> sub-system for all boards except ARMv8, ARMv7, ARM11. This is necessary
> as UEFI requires support for unaligned access. For ARM11 a function is
> provided to switch unaligned access support on.
> 
> Tom suggested to disable UEFI by default on ARM11 to reduce the size of
> the U-Boot binary. This would concern the following boards:
> 
> evb-ast2500_defconfig
> flea3_defconfig
> integratorcp_cm1136_defconfig
> mx31pdk_defconfig
> mx35pdk_defconfig
> rpi_0_w_defconfig
> rpi_defconfig
> woodburn_defconfig
> woodburn_sd_defconfig
> 
> At least the Raspberry boards should have no problem with UEFI enabled.
> 
> Do you see a necessity to use EFI_LOADER=n as default for any of the
> boards in the list above?

OpenBSD (quite deliberately) doesn't support these, so from our
standpoint this would be fine.