Running u-boot standalone hello_world on an image partition with qemu

[Lists Nick Betteridge]

Hi Tom,

Thanks for getting back to me

>> I'm developing on an ubuntu x86 machine, trying to run the u-boot
>> hello_world standalone application which resides on an image |sd.img| which
>> contains a partition
>>
>> I've compiled u-boot (|v2022.10|) with |qemu-x86_64_defconfig|
>>
>> I run qemu with "|qemu-system-x86_64 -m 1024 -nographic -bios u-boot.rom
>> -drive format=raw,file=sd.img"|
>>
>> u-boot starts up, doesn't find a script, doesn't detect tftp, and awaits a
>> command. If I type |"ext4ls ide 0:1|", I can clearly see hello_world.bin
>> (|3932704 hello_world.bin|).
>>
>> When I do a |ext4load ide 0:1 0x40000 hello_world.bin| (in preparation for
>> |go 40000 This is another test|), qemu/u-boot restarts.
>>
>> 0x40000 is the |CONFIG_STANDALONE_LOAD_ADDR| for x86.
>>
>> I have also tried making an image of hello_world |"mkimage -n "Hello stand
>> alone" -A x86_64 -O u-boot -T standalone -C none -a 0x40000 -d
>> hello_world.bin -v hello_world.img|" and tried to load the image into
>> 0x40000 with the intention of using |bootm| in case of cache issues -
>> qemu/u-boot still resets.
>>
>> Could anyone possibly point out the basic mistake I'm making?
> Using the standalone API on platforms where we support UEFI applications
> is strongly discouraged. If some part of the UEFI support in U-Boot is
> lacking for your use case we strongly encourage patches adding support
> for that (as we're doing right now for enhancing SPI support).
>

All I'm trying to do at the moment is develop a standalone program 
usingqemu (with -kvm) on my x86 ubuntu machine  and then target a 
platform (riscv or arm) at a later date.

The instructions in Readme.standalone, loading at a load address of 
0x40000, cause a restart of the boot process - mind you saying that, 
loading to a higher address (say 0x1000000) works but I'm unable to 
perform a 'go' as the non-relocatable standalone needs to be at 0x40000 
(CONFIG_STANDALONE_LOAD_ADDR)

If you can suggest a way forward for developing a u-boot standalone on 
an x86 machine, I would be hugely grateful!
Thanks again

Nick