Re: Breakpoint is not hitting for Kernel Debugging

On 9/4/07, dnl [off-list ref] wrote:

 I enabled the following options in Kernel for kernel Debugging,
CONFIG_BDI_SWITCH=y CONFIG_DEBUG_INFO=y under kernel hacking and MMU XALT in
BDI config file. After uboot initialization I fixed break point at
start_kernel(0xc02784bc), and then I booted the kernel. Without breaking  at
start_kernel, it came to login prompt. Please find attached config file with
this mail. Could anybody help me to solve this problem?

Hi Saravanan,
Try adding this line to your BDI config to clear/invalidate the page
table base address so that the MMU translation works before the MMU
has been initialised.

  ;; Following is to clear the page table base address
  WM32    0x000000f0      0x00000000

Make sure that you reload the BDI config, I use the  the BDI "BOOT"
command to do this.

Are you obtaining the start_kernel address from your kernel System.map
file and setting the breakpoint using the BDI command "BI 0xc02784bc"
or are you using a gdb debugger frontend ?

Bill