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I want to trace the raspberry pi booting process . I want to see in which file , in which function we are at a particular time and what that function is doing . Can anybody tell me the best way through which i can do this ?

Thank you !

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You may

Use qemu to emulate raspbian.The process is documented in this link

$ mkdir ~/rpi_emu
$ cd ~/rpi_emu
$ wget http://downloads.raspberrypi.org/raspbian_latest -0 -O 2014-01-07-wheezy-raspbian.zip
$ unzip 2014-01-07-wheezy-raspbian.zip -d .
$ rm 2014-01-07-wheezy-raspbian.zip
$ wget http://xecdesign.com/downloads/linux-qemu/kernel-qemu
$ qemu-system-arm -kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append "root=/dev/sda2 panic=1 rootfstype=ext4 rw init=/bin/bash" -hda 2014-01-07-wheezy-raspbian.img

This does not work under some windows managers. I have tried i3wm, awesome and GNOME Shell. Only GNOME Shell worked and the other two halted when I tried to focus my mouse to the guest OS.

If you successfully login to Raspbian, change the file /etc/ld.so.preload but not /usr/lib/arm-linux-gnueabihf/libcofi_rpi.so. As far as I know, this file contains only one line, put a # in front of it. Save and shutdown the Raspbian.

The second time boot it with

$ qemu-system-arm -s -S -kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append "root=/dev/sda2 panic=1 rootfstype=ext4 rw" -hda 2014-01-07-wheezy-raspbian.img

Then open another terminal, run

$ gdb-multiarch

qemu will wait for a gdb connection to start, so

$ gdb-multiarch
(gdb) set architecture arm
(gdb) target remote localhost:1234
(gdb) si            # to debug step by step
(gdb) x/i <address> # to disassemble code
-1

Install the bootlogd package using :

apt-get install bootlogd

It logs the boot process in /var/log/boot

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