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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.


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.

$ git clone


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

$ cd coreboot/payloads/libpayload
$ make menuconfig
$ make install


You can then get coreinfo itself and build it:

$ cd coreboot/payloads/coreinfo
$ make menuconfig
$ make

If you are fine with coreboot's default configuration, you can also build coreinfo directly without any steps beforehand as libreboot's build system automatically builds libpayload as a dependency:

$ make -C coreboot/payloads/coreinfo

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


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
$ unzip
$ 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.

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