Coreinfo

coreinfo is a small informational payload for coreboot. Currently, it can display CPU information, PCI information, coreboot table information, show an NVRAM dump, as well as a RAM dump.

Screenshots

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  CPU info

• 

  PCI info

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  coreboot table

• 

  NVRAM dump

• 

  RAM dump

Building coreinfo

libpayload and coreinfo are in the payloads/ directory of the coreboot tree. If you have already checked out the tree, you can skip the git clone steps below.

libpayload

The coreinfo payload uses libpayload, thus you need to get that first and build it:

$ git clone http://review.coreboot.org/p/coreboot
$ cd coreboot/payloads/libpayload
$ make menuconfig
$ make install

coreinfo

You can then get coreinfo itself and build it after linking to libpayload:

$ cd coreboot/payloads/coreinfo
$ ln -s ../../../libpayload/install/libpayload build/libpayload/
$ make menuconfig
$ make

The file build/coreinfo.elf is your final coreinfo payload which you can use with coreboot, either on real hardware or in a QEMU image.

coreboot

Finally, you have to build coreboot with coreinfo as payload:

$ cp coreboot/payloads/coreinfo/build/coreinfo.elf coreboot/payload.elf
$ cd coreboot
$ make menuconfig

Now enter the Payload menu and select Payload type and then An ELF executable payload file. Then, exit the menu, save your settings, and build coreboot:

$ make

The file build/coreboot.rom is your final coreboot image, which also contains the coreinfo payload.

Running coreinfo in QEMU

For running coreboot+coreinfo image in QEMU, you need

1 Previously described steps (build coreboot image for QEMU)

2 Patched version of vgabios-cirrus.bin in your build directory:

$ cd build
$ wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip
$ unzip Vgabios-cirrus.zip
$ cd ..

You can now run coreinfo in QEMU:

$ qemu-system-i386 -L build -hda /dev/zero -serial stdio

Ready-made coreinfo QEMU image

If you don't want to build libpayload, coreinfo, and coreboot from source, you can also use the ready-made coreinfo QEMU image by following the instructions on that page.

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.