In order to support c source code level debugging, it is a must to enable debugging option during compile

    mips-openwrt-linux-objdump -g vmlinux | grep -i DW_AT_comp_dir | grep -i indirect |  grep '\/'

Its output is like:

    <bb2043>   DW_AT_comp_dir : (indirect string, offset: 0x171): /disk/fs1/tmp2/openwrt/core/kernel_tree

• Discover vmlinux entry point

     mips-openwrt-linux-objdump -t vmlinux | grep -w "_text"

Its output in my setup: 60020000 g .text 00000000 _text

• Discover kernel_entry

    mips-openwrt-linux-objdump -f vmlinux

Its output in my setup: start address 0x6002df00

    mips-openwrt-linux-nm -n vmlinux | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > System.map

    mips-openwrt-linux-objdump -t vmlinux | grep dp_xmit

Suppose below working environment:

Lauterbach command:

  d.load.elf "X:\tmp2\shaoguoh\project\ugw61_grx500\openwrt\core\kernel_tree\vmlinux" /strippart "/disk/fs1/tmp2" /path "X:\tmp2" /nocode

Note:

• /strippart : remove the directory prefix in the elf's debugging source file's
• /path: change to samba folder
• /nocode: don't load code, but symbol only

Example:

If the location of one file in vmlinux debugging as below:

  /disk/fs1/tmp2/shaoguoh/project/ugw61_grx500/openwrt/core/kernel_tree/t.c

After /strippart “/disk/fs1/tmp2”, ie, strip the prefix as specified here, it become:

  shaoguoh/project/ugw61_grx500/openwrt/core/kernel_tree/t.c

After /path “X:\tmp2”, ie, add prefix as specified here, it become:

  X:\tmp2\shaoguoh/project/ugw61_grx500/openwrt/core/kernel_tree/t.c    

With this folder, now debugger can access this file via samba from windows

In openwrt/core, run: make kernel_menuconfig In kernel_hack, enable below items: