Ubuntu 16.04: Build buildroot and run QEMU

Table of Contents

1 Download buildroot

Download buildroot 2016.02 released version.

$ wget https://buildroot.org/downloads/buildroot-2016.02.tar.bz2

You can download also git repository’s one.

$ git clone https://git.busybox.net/buildroot/

2 Build buildroot

Use qemu_x86_defconfig for qemu-system-i386. Change tty1 to ttyS0 for using QEMU nographic option.

$ tar jxf buildroot-2016.02.tar.bz2$ cd buildroot-2016.02/$ make qemu_x86_defconfig$ sed -i -e ‘s/BR2_TARGET_GENERIC_GETTY_PORT=”tty1″/BR2_TARGET_GENERIC_GETTY_PORT=”ttyS0″/g’ .config$ make

3 Run QEMU

Install qemu-system-i386 with apt.

$ sudo apt-get install -y qemu-system-i386

Run QEMU with kernel output/images/bzImage and rootfs output/images/rootfs.ext2.

$ qemu-system-i386 –kernel output/images/bzImage –hda output/images/rootfs.ext2 –nographic –append “console=tty1 root=/dev/sda”WARNING: Image format was not specified for’output/images/rootfs.ext2′ and probing guessed raw. Automatically detecting the format is dangerous for rawimages, write operations on block 0 will be restricted. Specify the ‘raw’ format explicitly to remove therestrictions.Linux version 4.4.1 (hiroom2@ubuntu-16) (gcc version 4.9.3 (Buildroot2016.02) ) #1 SMP Tue May 10 08:23:43 JST 2016×86/fpu: Legacy x87 FPU detected.x86/fpu: Using ‘lazy’ FPU context switches.e820: BIOS-provided physical RAM map:BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usableBIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved<snip>Welcome to Buildrootbuildroot login: root#

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