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Memtest86 is a program which checks your RAM modules.
It can be run from within GRUB, but also as a coreboot payload (i.e. included in your ROM chip).
mkdir foo cd foo wget http://www.memtest86.com/memtest86-3.5.tar.gz tar xfvz memtest86-3.5.tar.gz cd memtest86-3.5
(Optional: edit config.h and set #define SERIAL_CONSOLE_DEFAULT 1 for serial support)
The file memtest is your final payload which you can use with coreboot (v2 or v3), either on real hardware or in a QEMU image.
Finally, you have to build coreboot (v3 in this example) with Memtest86 as payload:
cd .. svn co svn://coreboot.org/repository/coreboot-v3 -r656 cp memtest86-3.5/memtest coreboot-v3/payload.elf cd coreboot-v3 make menuconfig
Now enter the Payload menu and select Payload type and then An ELF executable payload file. Now exit the menu, save your settings, and build coreboot:
The file build/coreboot.rom (or build/bios.bin) is your final coreboot v3 image, which also contains the payload.
Running Memtest86 in QEMU
For running the coreboot+Memtest86 image in QEMU, you need a patched version of vgabios-cirrus.bin in your build directory first:
cd build wget http://www.coreboot.org/images/0/0d/Vgabios-cirrus.zip unzip Vgabios-cirrus.zip cd ..
You can now run coreboot and Memtest86 in QEMU:
qemu -L build -hda /dev/zero -serial stdio
Ready-made QEMU image
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