Re: [Qemu-discuss] [Qemu-devel] Debugging bootloader with gdb in qemu

[Antony Pavlov]

On Wed, 1 Jan 2014 12:55:38 +0500
Maryyam Muhammad Din <address@hidden> wrote:

> I am trying to debug bootloader with gdb in QEMU. I run QEMU command like
> this
> 
> ./qemu-system-mips64 -s -S -m 1024 -M  octeon  -bios
> u-boot-octeon_ebh5610.bin  -kernel vmlinux.64 -append 'coremask=001 mem=0
> root=/dev/sda2'
> 
> and then connect gdb using
> 
> mips64-octeon-linux-gnu-gdb u-boot-octeon_ebh5610
> target remote localhost:1234
> 
> when i try to step into bootloader code, it continues execution without
> breaking. This totally skip the bootloader code which i want to examine
> step by step as it execute.
> Can anyone suggest, what do i need to do to resolve this issue.

See this screencast:

  http://dir.tftpd.net:7080/~antony/mips-barebox-qemu-gdb-howto-20131219.avi

This screencast will show you how to trace bootloader (barebox, 
http://www.barebox.org)
for MIPS malta using qemu and gdb.

> Thank You
> -- 
> Maryyam Muhammad Din
> Al-Khawarizmi Institute of Computer Science
> UET Lahore


-- 
-- 
Best regards,
  Antony Pavlov