[SeaBIOS] [Question] Debug Seabios by GDB with Qemu

[Liu, Jing2]

Hello,

I am using Seabios for qemu startup, and interested in the debugging by 
GDB to see how the bios works.

Currently, I do it as https://www.seabios.org/Debugging said but met 
some problems so that couldn't move on. :(
Could someone give some pointers on what I missed or have to do to 
enable the gdb debugging?

Note:
Arch: x86_64 PC
CONFIG_DEBUG_SERIAL is enabled.
CONFIG_RELOCATE_INIT is disabled.

1.  After Qemu starts, I run "gdb out/rom32seg.o" in another session, 
and do "target remote localhost:1234", it warns me that
"Selected architecture i386 is not compatible with reported target 
architecture i386:x86_64". But I didn't find any 64bit rom.

2. I can't set any breakpoints (e.g. maininit), because "Function 
maininit not defined". So where does seabios put the symbol table? And 
how to break the seabios functions when qemu starts?

Looking forward to your response!
Thanks,
Jing