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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. You can also build it directly from the coreboot build by selecting it as a 'seconday payload' from the payloads menu.

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 

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