How to debug Linux4.0 ARM Versatile build on Qemu
Below is tested on Ubuntu 14.04
Install toolchain
sudo apt-get install gcc-arm-linux-gnueabi
Install Qemu for ARM
sudo apt-get install qemu-system-arm
Install GDB for ARM
sudo apt-get -o Dpkg::Options::="--force-overwrite" install gdb-arm-none-eabi
Some error happens without force overwrite option
Build Kernel with Device Tree Support
cd Linux4.0
make versatile_defconfig
make xconfig
On the GUI xconfig window, find below configs (by Ctrl+F) and
check on CONFIG_USE_OF
check on CONFIG_MACH_VERSATILE_DT
check on CONFIG_MACH_DEBUG_INFO
Save the config
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabi-
make -j9
Run On Qemu
qemu-system-arm -M versatileab -nographic -dtb
./arch/arm/boot/dts/versatile-ab.dtb -kernel arch/arm/boot/zImage
-append “console=ttyAMA0″
or
qemu-system-arm -M versatileab -nographic -dtb
./arch/arm/boot/dts/versatile-ab.dtb -kernel arch/arm/boot/zImage
-append “console=ttyAMA0″ -s -S
The second command will cause the Qemu to pause at start before any gdb client is connected
Debug with GDB
cd Linux4.0
ddd --debugger arm-none-eabi-gdb
On ddd command console
target remote :1234
file vmlinx
b setup_arch
c
....
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