linux-kernel - Debugging Linux OMAP kernel with kgdb and Eclipse

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Date:	Thu, 07 Oct 2010 13:55:24 +0400
From:	Elvis Dowson <elvis.dowson@....com>
To:	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Debugging Linux OMAP kernel with kgdb and Eclipse

Hi,
       I'm trying to setup a kernel debugging environment for the Gumstix Overo Earth (TI OMAP 3503) + Palo43 using Eclipse. 

I have enabled kgdb in the kernel (linux-omap-2.6.32 based android kernel).

My bootargs were

# setenv console ttyS2,115200n8
# setenv mmcargs 'setenv bootargs console=${console} vram=12M omapfb.vram=0:4M omapfb.mode=dvi:${dvimode} omapdss.def_disp=${defaultdisplay} root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait init=/init kgdboc=${console} kgdbwait'

The kernel boots and waits correctly for input as follows:

console [ttyS2] enabled
kgdb: Registered I/O driver kgdboc.
kgdb: Waiting for connection from remote gdb...

I have also configure Eclipse IDE, and built the kernel, and when I run it in debug mode, it launches the kernel and the whole android OS boots correctly, and Eclipse IDE shows a number of threads running, but I can seem to see any source code highlighted, even through I set a breakpoint in board-overo.c (my board file) for the init board routine. It should have stopped and paused execution at the breakpoint. 

Question 01: When building from Eclipse IDE, it builds uImage, but for the debug settings, I selected vmlinux that was generated in the root folder. I ran uImage on the target board, but for the executable for the debug session I used vmimage. Is that correct?

When I launch Eclipse debugger, I can see a number of threads running, it doesn't display any source code, I can't pause any threads, and the breakpoints don't appear to be working. 

What should I do ?

Best regards,

Elvis Dowson
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