kgdb for RPI

CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_INFO=y
CONFIG_KGDB_SERIAL_CONSOLE=y 
CONFIG_KGDB_KEYBOARD=y
CONFIG_FRAME_POINTER=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_STACKTRACE=y

• ./bootable/configs/cmdline.txt

• add kgdboc=ttyAMA0,115200 kgdbwait to cmdline.txt

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 
kgdboc=ttyAMA0,115200 kgdbwait console=tty1 
root=/dev/mmcblk0p2 rootfstype=ext4 
elevator=deadline fsck.repair=yes rootwait

• kdb go

$3#33  -> go 進系統

echo g > /proc/sysrq-trigger  -> kgdb wait gdb 連進來

cgdb -d arm-linux-gnueabihf-gdb ./out/target/HMD/RPi2/obj/KERNEL_OBJ/vmlinux

• gdbinit

set remotebaud 115200
target remote /dev/ttyUSB1