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

[Lists Nick Betteridge]

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?

Thanks in advance