[U-Boot] [PATCH] arm64: mvebu: fix crash in EFI memory allocation

[Baruch Siach]

Hi Stephen,

Adding Heinrich Schuchardt.

Stephen Warren writes:
> On 11/22/18 8:19 AM, Baruch Siach wrote:
>> Adding Stephen Warren to Cc.
>>
>> On Thu, Nov 22, 2018 at 02:30:34PM +0000, Alexander Graf wrote:
>>>> Am 22.11.2018 um 11:42 schrieb Baruch Siach <baruch at tkos.co.il>:
>>>>
>>>> EFI memory allocation code return values that are not mapped by U-Boot
>>>> MMU. This causes a crash when tftp calls efi_set_bootdev(). Fix this
>>>> similarly to commit 0797f7f0b7e1 ("ARM: tegra: reserve unmapped RAM so
>>>> EFI doesn't use it").
>>>>
>>>> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
>>>
>>> Hm, how about we fox this up in the common memory registration function and
>>> add addresses > board_get_usable_ram_top() as boot time data?
>>
>> That would be much nicer indeed. Where should I look in lib/efi_loader/ to
>> implement that?
>>
>> With that in place we can revert commit 0797f7f0b7e1, right? Stephen, do you
>> concur?
>
> I believe so, yes. I'm not sure why it's acceptable to fix the EFI allocator
> to solve this now, when it wasn't acceptable before though.

I read the previous discussion[1] from July/August. If I understand the
conclusion correctly, efi_add_memory_map() provides information that is
vital to the correctness of the EFI memory map, and is platform
specific. Is that correct?

If so, then this patch (actually, its v2) is the correct solution for
Armada 8K. A possible improvement to the EFI memory allocation code
would be a warning instead of crash. Would that be acceptable?

Thanks,
baruch

[1] https://lists.denx.de/pipermail/u-boot/2018-July/336726.html

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