etc:users:jcmvbkbc:omap-support-pieces
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Table of Contents
N8x0 support in linux-omap
Current kernel: 2.6.31-rc1-omap1
Debug interfaces
Subsystems' status
Debugging in qemu
Need CONFIG_DEBUG_INFO=y in kernel configuration for the following to work.
Magic numbers:
- 0x80000000 – here the kernel is loaded
- 0x80008000 – here we jump after decompression (.text.head that has VA of 0xc0008000 has PA 0x80008000 until MMU is active)
- 0xc0026000 – 'arm-linux-gnu-objdump -x vmlinux' says that .text starts here
Script for gdb session:
target remote 127.0.0.1:1234 break *0x80008000
To debug compression-related stuff from the very beginning (start, arch/arm/boot/compressed/head.S) till start_kernel:
add-symbol-file ~/ws/osll/omap/20090610/linux-omap-2.6/arch/arm/boot/compressed/vmlinux 0x80000000
To debug kernel from stext (arch/arm/kernel/head.S) until MMU is active:
add-symbol-file ~/ws/osll/omap/20090610/linux-omap-2.6/vmlinux 0x80026000 -s .text.head 0x80008000
To debug kernel from start_kernel (init/main.c):
add-symbol-file ~/ws/osll/omap/20090610/linux-omap-2.6/vmlinux 0xc0026000
Debugging on real HW
etc/users/jcmvbkbc/omap-support-pieces.1246312555.txt.gz · Last modified: 2009/06/30 01:55 by jcmvbkbc