Run Linux Kernel on QEMU emulator
===

###### tags: `linux` `kernel` `env-setup` `qemu`

## Prev Step

[step 3: Build Kernel](https://hackmd.io/VL0CysI4TXG_ahNq-SSRFg)

## Run qemu

在 linux-5.10.1 路徑下輸入以下指令使用 qemu 模擬一個 arm cpu 並在上面跑 Linux:

qemu-system-arm -M vexpress-a9 -smp 4 -m 1024M -nographic \
-kernel ./build/arch/arm/boot/zImage \
-dtb ./build/arch/arm/boot/dts/vexpress-v2p-ca9.dtb \
-append "rdinit=/linuxrc console=ttyAMA0 loglevel=8"

Now you are running linux-5.10.1 on arm v7 platform emulated by qemu:

(不知道為什麼會多個?p)

### close qemu

ctrl + a + x
or

open another terminal:

killall qemu-system-arm

## Trouble shooting

1./bin/sh: 1: flex: not found

sudo apt install flex

2./bin/sh: 1: bison: not found

sudo apt install bison

3.Command 'qemu-system-arm' not found

sudo apt install qemu-system-arm