QEMU Build Tutorial: Difference between revisions
Line 11: | Line 11: | ||
* GCC ie. v4.x | * GCC ie. v4.x | ||
* Qemu ie. v0.8.2 | * Qemu ie. v0.8.2 | ||
* FILO ie. v0. | * FILO ie. v0.4.2 | ||
* LinuxBIOS ie. | * LinuxBIOS ie. r2394 | ||
=== Creating FILO === | === Creating FILO === |
Revision as of 20:57, 7 September 2006
Introduction
If you don't have a mainboard supported by LinuxBIOS don't worry: Qemu can help you to emulate one.
This nice tutorial was written by Alan Carvalho de Assis <acassis@gmail.com>.
Requirements
You need the following softwares:
- GCC ie. v4.x
- Qemu ie. v0.8.2
- FILO ie. v0.4.2
- LinuxBIOS ie. r2394
Creating FILO
Download FILO (I used filo-0.4.2.tar.bz2), decompress it, enter inside directory created.
First invocation of make creates the default Config file.
$ make
Edit this file as you like. The default configuration worked to me.
$ vi Config
Run make again to create filo.elf, the ELF FILO image.
$ make
You will need this file (filo.elf) to start Linux. This is used as a payload in LinuxBIOS, when executed it can load Linux kernel.
Creating LinuxBIOS
Download LinuxBIOS source code (I used LinuxBIOSv2-2394). Decompress it.
Change to directory targets/emulation/qemu-i386 and modify Config.lb to point to your filo.elf.
Return to targets directory and execute:
$ ./buildtarget emulation/qemu-i386
Go to targets/emulation/qemu-i386/qemu-i386 and execute:
$ make
It will create the file "qemu-bios.rom"
Rename this file to "bios.bin" and copy to your HOME directory.
Creating your disk image
Create a empty file (~ 200MB):
# dd if=/dev/zero of=disk.img bs=1M count=200
Format it as ext2:
# mkfs.ext2 -F disk.img
Mount it on somewhere:
# mount disk.img /mnt/rootfs -t ext2 -o loop
Now you need copy a root filesystem to it.
I create a directory /debian and used debootstrap command to create a basic root filesystem, but you can use any root filesystem from your distro (i.e. copy one from diskboot.img):
# cp -R /debian/* /mnt/rootfs
Open the file /mnt/rootfs/etc/inittab and change runlevel to level 1:
id:1:initdefault:
Change to /mnt/rootfs/boot and copy your default vmlinuz and initrd:
# cp /boot/vmlinuz-2.6.16-2-686 vmlinuz # cp /boot/initrd.img-2.6.16-2-686 initrd
Change to /root and umount /mnt/rootfs:
# umount /mnt/rootfs
Exit of root account:
# exit
Starting LinuxBIOS in Qemu
Execute Qemu using the followings parameters:
$ qemu -L ~ -hda disk.img -nographic -no-kqemu -d in_asm,exec
When appear "boot:" text enter it:
boot: hda:/boot/vmlinuz root=/dev/hda initrd=/boot/initrd console=tty0 console=ttyS0,115200