u‐boot - MarekBykowski/readme GitHub Wiki

fvp‐base-u‐boot-build-from-sdk

What to see in there

• vectors
• mmu
• commands

Execution

I set a stop (branching to itself "0: b 0b") at reset vector

interrupt
delete breakpoints

Add u-boot symbols and tell the debugger where the sources are

add-symbol-file /home/ubuntu/yocto/poky/arm-aem-build/tmp/work/fvp_base-poky-linux/u-boot/2024.01/build/u-boot
directory /home/ubuntu/yocto/poky/arm-aem-build/tmp/work/fvp_base-poky-linux/u-boot/2024.01/git

If stop advance to next instruction

set var $aarch64::$core::$pc += 4

From here you can to u‐boot-vectors

Continue running the target post interrupt

continue
interrupt

Our u-boot relocated itself. Find a relocation offset from u-boot printout and add the symbols with the offset again. No need to tell the debugger where the sources are as they remained in same.

add-symbol-file /home/ubuntu/yocto/poky/arm-aem-build/tmp/work/fvp_base-poky-linux/u-boot/2024.01/build/u-boot 0x76f73000

I set a stop after relocation so again advance to the next instruction (instructions are always 32 bit long)

set var $aarch64::$core::$pc += 4                           

From here you can go to u‐boot-mmu