How to do source level debugging of x86 code with GDB inside QEMU?

Question

I wrote a x86 assembly program for MBR section. I compile it as follows:

nasm hellombr.asm -f bin -o hellombr.img

Then I run it in qemu:

Answer 1

A really good (and simple) way is to use IDA with bochs, you find an excellent blog post on it here, along with some other hints/suggestions for bootloader development.