linux debug cmd

temporary close kernel print message:

echo 0 > /proc/sys/kernel/printk

temporary open all kernel print message:

echo 8 > /proc/sys/kernel/printk

look kernel interrupt message:

cat /proc/interrupts

mount debugfs:

mount -t debugfs none /sys/kernel/debug

look gpio message:

cat /sys/kernel/debug/gpio

.o file disassembling:

arm-linux-gnueabihf-objdump -d -S test.o

.dtb file decompilation:

dtc -I dtb -O dts imx6ull-mzq.dtb > my.dts