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* [[QEMU Build Tutorial]] — Starting a Debian GNU/Linux system via coreboot + a Linux kernel, or via coreboot + [[FILO]].
* [[QEMU Build Tutorial]] — Starting a Debian GNU/Linux system via coreboot + a Linux kernel, or via coreboot + [[FILO]].
* [[Booting FreeBSD using coreboot]] — Booting FreeBSD via coreboot + ADLO.
* [[FreeBSD|Booting FreeBSD using coreboot]] — Booting FreeBSD via coreboot + ADLO.


== Ready-made QEMU images ==
== Ready-made QEMU images ==


We'll soon provide various downloadable QEMU images you can use to try out coreboot.
Below is a list of various downloadable QEMU images you can use to try out coreboot.


You need a patched version of '''vgabios-cirrus.zip''' for these images to work fine, the version in QEMU's CVS repository does '''not''' yet work. The image from Debian's QEMU package ('''/usr/share/qemu/vgabios-cirrus.bin''') is already patched and works, too.
You need a patched version of '''vgabios-cirrus.zip''' for these images to work fine, the version in QEMU's CVS repository does '''not''' yet work. The image from Debian's QEMU package ('''/usr/share/qemu/vgabios-cirrus.bin''') is already patched and works, too.


=== coreboot v3 + coreinfo ===
=== coreboot v2 + SeaBIOS ===


[[Image:Coreinfo nvram.png|thumb|right|coreinfo NVRAM dump.]]
[[File:Qemu seabios.png|thumb|right|[[SeaBIOS]] payload.]]


  $ mkdir tmp
[[SeaBIOS]] is an open-source legacy BIOS implementation which can be used as a coreboot payload. It implements the standard BIOS calling interfaces that a typical x86 proprietary BIOS implements.
  $ cd tmp
 
  $ wget http://www.coreboot.org/images/0/06/Qemu_coreboot_coreinfo.zip
The QEMU image uses coreboot v2 (r4917) and [[SeaBIOS]] (9eebe66a9978165cfa91f2266c97fa5d0aa6ef2e, 2009-11-04) with the following changes to the default '''src/config.h''':
  $ wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
 
  $ unzip Qemu_coreboot_coreinfo.zip
#define CONFIG_COREBOOT 1
  $ unzip Vgabios-cirrus.zip
#define CONFIG_DEBUG_SERIAL 1
  $ cd ..
#define CONFIG_COREBOOT_FLASH 1
  $ qemu -L tmp -hda /dev/zero -serial -stdio
#define CONFIG_OPTIONROMS_DEPLOYED 0
#define CONFIG_VGAHOOKS 1
 
Usage:
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/6/6a/Qemu_coreboot_seabios.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_seabios.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_seabios.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
Replace '''/dev/zero''' above with a real QEMU disk image to actually boot something.
 
=== coreboot v3 + FILO ===
 
[[Image:Qemu filo.png|thumb|right|[[FILO]] payload.]]
 
[[FILO]] is a simple bootloader which can load (e.g.) Linux kernels from disk.
 
The QEMU image uses coreboot v3 (r672) and [[FILO]] (r45) with a certain configuration (for example: it's looking for '''/boot/grub/menu.lst''' on hda1).
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/b/b9/Qemu_coreboot_filo.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_filo.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_filo.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
Replace '''/dev/zero''' above with a real QEMU disk image which has a '''/boot/grub/menu.lst''' on '''hda1''' to actually boot something.
 
=== coreboot + libpayload + coreinfo ===
 
[[Image:Coreinfo nvram.png|thumb|right|[[coreinfo]] NVRAM dump.]]
 
This is a small payload called [[coreinfo]].
 
  mkdir foo
  cd foo
  wget http://www.coreboot.org/images/0/06/Qemu_coreboot_coreinfo.zip
  wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
  unzip Qemu_coreboot_coreinfo.zip
  unzip Vgabios-cirrus.zip
  mv qemu_coreboot_coreinfo.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
=== coreboot v3 + invaders ===
 
[[Image:Coreboot invaders.png|thumb|right|[[GRUB invaders]] as payload.]]
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/c/c8/Qemu_coreboot_invaders.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_invaders.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_invaders.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
=== coreboot v3 + libpayload + tint ===
 
[[Image:Coreboot libpayload tint.png|thumb|right|[[tint]] as payload.]]
 
This is coreboot v3 (r656), [[libpayload]] (r3225), and tint 0.03b patched to be built against libpayload.
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/6/62/Qemu_libpayload_tint.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_libpayload_tint.zip
unzip Vgabios-cirrus.zip
mv qemu_libpayload_tint.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
=== coreboot v3 + Memtest86 ===
 
[[Image:Qemu memtest.png|thumb|right|[[Memtest86]] payload.]]
 
This is coreboot v3 (r656) and [[Memtest86]] (3.4) with serial support enabled. The VGA display in QEMU is broken after a few seconds, this is a known issue, but we don't yet know what exactly the problem is.
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/3/33/Qemu_coreboot_memtest.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_memtest.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_memtest.bin bios.bin
cd ..
  qemu -L foo -hda /dev/zero -serial stdio
 
=== coreboot v3 + OpenBIOS ===
 
[[Image:Qemu coreboot openbios.png|thumb|right|[[OpenBIOS]] payload.]]
 
This is coreboot v3 (r672) and [[OpenBIOS]] (r186).
 
mkdir foo
cd foo
wget http://www.coreboot.org/images/9/9d/Qemu_coreboot_openbios.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_openbios.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_openbios.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio
 
== Debugging ==
 
You can use embedded gdbserver features inside qemu.
For example to start gdbserver on localhost 1234 port you need add "-s" option.
Also it's very useful add "-S" option to stop qemu at the start, so you can run
booting process from gdb
 
qemu -L . -bios coreboot.rom -nographic -s -S
 
And then you can use gdb for debugging coreboot:
gdb> target remote localhost:1234
gdb> bt [some_address]
gdb> run
gdb> i r
 
For improve gdb output you can add this to ~/.gdbinit file:
set history save on
set disassembly-flavor intel
display/4i $pc
 
Also tracing option available in qemu "-d"
You only need choose trace level: in_asm, exec, cpu, out_asm
And qemu place tracing log at the /tmp/qemu.log
 
{{PD-self}}

Latest revision as of 10:04, 10 December 2012

You can easily try out coreboot using QEMU, without having to actually flash the BIOS chip on your real hardware.

Tutorials

Ready-made QEMU images

Below is a list of various downloadable QEMU images you can use to try out coreboot.

You need a patched version of vgabios-cirrus.zip for these images to work fine, the version in QEMU's CVS repository does not yet work. The image from Debian's QEMU package (/usr/share/qemu/vgabios-cirrus.bin) is already patched and works, too.

coreboot v2 + SeaBIOS

SeaBIOS payload.

SeaBIOS is an open-source legacy BIOS implementation which can be used as a coreboot payload. It implements the standard BIOS calling interfaces that a typical x86 proprietary BIOS implements.

The QEMU image uses coreboot v2 (r4917) and SeaBIOS (9eebe66a9978165cfa91f2266c97fa5d0aa6ef2e, 2009-11-04) with the following changes to the default src/config.h:

#define CONFIG_COREBOOT 1
#define CONFIG_DEBUG_SERIAL 1
#define CONFIG_COREBOOT_FLASH 1
#define CONFIG_OPTIONROMS_DEPLOYED 0
#define CONFIG_VGAHOOKS 1

Usage:

mkdir foo
cd foo
wget http://www.coreboot.org/images/6/6a/Qemu_coreboot_seabios.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_seabios.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_seabios.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

Replace /dev/zero above with a real QEMU disk image to actually boot something.

coreboot v3 + FILO

FILO payload.

FILO is a simple bootloader which can load (e.g.) Linux kernels from disk.

The QEMU image uses coreboot v3 (r672) and FILO (r45) with a certain configuration (for example: it's looking for /boot/grub/menu.lst on hda1).

mkdir foo
cd foo
wget http://www.coreboot.org/images/b/b9/Qemu_coreboot_filo.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_filo.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_filo.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

Replace /dev/zero above with a real QEMU disk image which has a /boot/grub/menu.lst on hda1 to actually boot something.

coreboot + libpayload + coreinfo

coreinfo NVRAM dump.

This is a small payload called coreinfo.

mkdir foo
cd foo
wget http://www.coreboot.org/images/0/06/Qemu_coreboot_coreinfo.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_coreinfo.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_coreinfo.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

coreboot v3 + invaders

GRUB invaders as payload.
mkdir foo
cd foo
wget http://www.coreboot.org/images/c/c8/Qemu_coreboot_invaders.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_invaders.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_invaders.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

coreboot v3 + libpayload + tint

tint as payload.

This is coreboot v3 (r656), libpayload (r3225), and tint 0.03b patched to be built against libpayload.

mkdir foo
cd foo
wget http://www.coreboot.org/images/6/62/Qemu_libpayload_tint.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_libpayload_tint.zip
unzip Vgabios-cirrus.zip
mv qemu_libpayload_tint.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

coreboot v3 + Memtest86

Memtest86 payload.

This is coreboot v3 (r656) and Memtest86 (3.4) with serial support enabled. The VGA display in QEMU is broken after a few seconds, this is a known issue, but we don't yet know what exactly the problem is.

mkdir foo
cd foo
wget http://www.coreboot.org/images/3/33/Qemu_coreboot_memtest.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_memtest.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_memtest.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

coreboot v3 + OpenBIOS

OpenBIOS payload.

This is coreboot v3 (r672) and OpenBIOS (r186).

mkdir foo
cd foo
wget http://www.coreboot.org/images/9/9d/Qemu_coreboot_openbios.zip
wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
unzip Qemu_coreboot_openbios.zip
unzip Vgabios-cirrus.zip
mv qemu_coreboot_openbios.bin bios.bin
cd ..
qemu -L foo -hda /dev/zero -serial stdio

Debugging

You can use embedded gdbserver features inside qemu. For example to start gdbserver on localhost 1234 port you need add "-s" option. Also it's very useful add "-S" option to stop qemu at the start, so you can run booting process from gdb

qemu -L . -bios coreboot.rom -nographic -s -S

And then you can use gdb for debugging coreboot:

gdb> target remote localhost:1234
gdb> bt [some_address]
gdb> run
gdb> i r

For improve gdb output you can add this to ~/.gdbinit file:

set history save on
set disassembly-flavor intel
display/4i $pc

Also tracing option available in qemu "-d" You only need choose trace level: in_asm, exec, cpu, out_asm And qemu place tracing log at the /tmp/qemu.log

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