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

From: Antony Pavlov
Subject: Re: [Qemu-discuss] [Qemu-devel] Debugging bootloader with gdb in qemu
Date: Wed, 1 Jan 2014 13:27:50 +0400

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:


This screencast will show you how to trace bootloader (barebox, 
for MIPS malta using qemu and gdb.

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

Best regards,
  Antony Pavlov

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