[U-Boot] U-Boot API example doesn't support 64-bit

[Alexander Graf]

Hi Sebastian,

I think the honest answer is: Please don't. The U-Boot API is very
unmaintained and puts awkward restrictions onto payloads on ARM64
(reserved register for gd).

If you're already on AArch64, just create a UEFI binary (for example via
gnuefi[1], or using llvm[2] which can natively emit them) and boot that
using bootefi. It should give you at least as much functionality as the
U-Boot API, but with the added benefit of being firmware agnostic.


Thanks,

Alex

[1] https://station.eciton.net/fun-and-games-with-gnu-efi.html
[2] https://dvdhrm.github.io/2019/01/31/goodbye-gnuefi/

On 15.04.19 11:39, Priebe, Sebastian wrote:
> Hello again,
>
> can nobody help to solve this problem?
> Any help would be very appreciated.
> Thanks.
>
> Sebastian
>
>> -----Ursprüngliche Nachricht-----
>> Von: U-Boot <u-boot-bounces at lists.denx.de> Im Auftrag von Priebe,
>> Sebastian
>> Gesendet: Freitag, 12. April 2019 14:32
>> An: u-boot at lists.denx.de
>> Betreff: [U-Boot] U-Boot API example doesn't support 64-bit
>>
>> Hello,
>>
>> I'd like to use the U-Boot external API with an ARM64 SoC.
>> If I enable CONFIG_API I get the following build error for the API example:
>> examples/api/crt0.S: Assembler messages:
>> examples/api/crt0.S:33: Error: operand 1 should be an integer register -- `ldr
>> ip,=search_hint'
>> examples/api/crt0.S:34: Error: operand 1 should be an integer register -- `str
>> sp,[ip]'
>> examples/api/crt0.S:40: Error: operand 1 should be an integer register -- `ldr
>> ip,=syscall_ptr'
>> examples/api/crt0.S:41: Error: operand 1 should be an integer register -- `ldr
>> pc,[ip]'
>> scripts/Makefile.build:316: recipe for target 'examples/api/crt0.o' failed
>>
>>
>> For me it seems that the example lacks support for 64-bit.
>>
>> Can anybody help me to get the example running on 64-bit?
>>
>> Apparently I have only very litte knowledge of assembler :-(
>>
>>
>>
>> Best regards
>>
>> Sebastian Priebe
>>
>> SII Technologies GmbH
>
>
>
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