Memtest86+

Building

Instead of building coreboot with MemTest86+ as its default payload, it is recommended to simply load the binary from your payload of choice as an extra boot option.

Manual build

Clone the source from coreboot's memtest86+ repository. This was based on the latest released archive, then cleaned up, and then had various patches applied.

$ git clone https://review.coreboot.org/memtest86plus 

CD to the directory and build it:

$ cd memtest86plus
$ make

The resulting binaries are:

memtest: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped
memtest.bin: DOS/MBR boot sector

In case GRUB2 is used default payload, add the x86-bootable memtest.bin to your ROM image with

$ cbfstool coreboot.rom add -f memtest.bin -n memtest.bin -t raw

and add the following entry to your grub.cfg:

menuentry 'MemTest86+ 5.01' {
    set root='cbfsdisk'
    linux16 /memtest.bin
}

Alternatively one can also load it directly from disk, e.g. by placing it under /boot/memtest.bin and adjusting the menuentry accordingly:

search -n --set=root -f /boot/memtest.bin