How should I build u-boot for qemu_arm64_defconfig and run it on arm64 qemu virt machine?
ckim at etri.re.kr
Mon May 8 11:40:31 CEST 2023
Today I tried this test from scratch.
In my environment, CROSS_COMPILE=aarch64-none-elf.
Under u-boot directory, when I do 'make CROSS_COMPILE=aarch64-none-elf-
qemu_arm64_defconfig' and 'make -j28', I see this error at the end.
aarch64-none-elf-ld.bfd: invalid length for memory region .sram
after examining it, I added in include/configs/qemu-arm.h,
#define CONFIG_SPL_MAX_SIZE value to 0x400000
After fixing it, I got another similar error for .sdram and I added in
#define CONFIG_SPL_BSS_START_ADDR 0x40800000
#define CONFIG_SPL_BSS_MAX_SIZE 0x100000
Now I can do 'make -j28' with no error.
But I found I have both 'u-boot' and 'spl/u-boot-spl' generated and I
realized for this qemu_arm64_defconfig, CONFIG_SPL=y and I get both u-boot
proper and u-boot spl. (SPL: secondary program loader, proper: main
bootloader. SPL runs first and the proper runs next).
Until now I did objcopy of the u-boot(proper) and then extended it to
0x400000 byte. (the pflash size of the virt machine which starts at address
$ aarch64-none-elf-objcopy -O binary u-boot.v2022.07/u-boot pflashp.img
$ dd if=/dev/zero of=pflashp.img bs=1c count=1 seek=67108863
And the qemu command is :
$ qemu-6.2.0/build/aarch64-softmmu/qemu-system-aarch64 -machine
virt,gic-version=max,secure=on,virtualization=true -cpu max -drive
if=pflash,file=pflashp.img -m 2G -nographic -device
The qemu virt machine has RAM from 0x40000000 until 0xbfffffff.
And I could see u-boot runs and it waits input for 3 seconds and outputs the
This is running u-boot (proper) from address 0 but since I have u-boot-spl
too, I should run it from u-boot-spl first, shouldn't I?
How am I supposed to run u-boot-spl and u-boot on this qemu machine? (from
lds files, it looks like they both start at address 0).
(qemu machine is arm64 virt machine, qemu 6.2.0).
More information about the U-Boot