Difference between revisions of "QEMU"

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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 foo
+
[[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 foo
+
 
−
  $ 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
−
  $ mv qemu_coreboot_coreinfo.bin bios.bin
+
#define CONFIG_COREBOOT_FLASH 1
−
  $ cd ..
+
#define CONFIG_OPTIONROMS_DEPLOYED 0
−
  $ qemu -L foo -hda /dev/zero -serial stdio
+
#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 ===
 
=== coreboot v3 + invaders ===
  
−
[[Image:Coreboot invaders.png|thumb|right|The [[invaders]] payload.]]
+
[[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
  
−
$ mkdir foo
+
{{PD-self}}
−
$ 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
+

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

Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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