Use QEMU for kernel debug

[TOC]

Versions Info

uboot: 2016.09
linux kernel: 4.7.4
busybox: 1.25.0
buildroot: 2016.08
qemu-system-arm: 2.8.1

Ubuntu: 16.04

Install softwares

apt-get install gcc-arm-linux-gnueabi g++-arm-linux-gnueabi qemu-system-arm

Create Root Image as ext3

dd if=/dev/zero of=root.ext3 bs=300M count=1
mkfs.ext3 -L root root.ext3

Mount Root Image

mkdir root
sudo mount -t ext3 -o sync,nolazytime,atime,commit=1 root.ext3 root sudo mount -t ext3 -o commit=1 root.ext3 root

Build kernel

cp kernel_defconfig kernel_source/.config
make O=../out ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- olddefconfig
make O=../out ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig
make O=../out ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage
make O=../out ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs

Boot without uboot

./qemu.sh

Qemu operate usage

CTRL-a + c; enter/exit QEMU console
== In QEMU console == system_reset; reboot system
quit; terminate QEMU

Use buildroot generate root file system

cp ==buildroot_defconfig== buildroot-2016.08/.config
make olddefconfig
make menuconfig
make
cp output/target/* <root_disk>/ -ar
==chown root:root <root_disk>/ -R==

Needs self add /dev/null and /dev/urandom char type devices in root filesystem. Default username: root, password: admin

Enable Network

sudo apt-get install bridge-utils uml-utilities libvirt-bin
QEMU with arg
-net nic,macaddr=00:e0:4c:11:xx:xx -net tap,ifname=tap0,script=ifup-tap0,downscript=ifdown-tap0

#/etc/network/interfaces Append
#auto virbr0
#iface virbr0 inet dhcp

bridge_ports eth0

bridge_stp off

bridge_fd 0

bridge_maxwait 0

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A INPUT -i tap0 -j ACCEPT
sudo iptables -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A OUTPUT -j ACCEPT
sudo sysctl -w net.ipv4.ip_forward=1

On Board
route add default gw 192.168.1.1
ifconfig eth0 192.168.10.2