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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.

Manual build

First download the latest tarball, extract and cd into it:

$ curl -O
$ tar -xvzf memtest86+-5.01.tar.gz && cd memtest86+-5.01

The default Makefile includes a scp command to backup already built binaries, which we obviously don't want. Furthermore, due to MemTest86+ 5.01 not being updated since 27.09.2013, compilation will fail on newer versions of GCC unless a specific option is added. Last but not least SERIAL_BAUD_RATE should be increased; we might also want to hear a beep before memory testing starts. The following patch includes all those changes, feel free to adjust.

--- Makefile    2015-11-18 23:49:40.900093793 +0100
+++        2015-11-19 00:08:37.392634002 +0100
@@ -15,3 +15,3 @@
 CFLAGS= -Wall -march=i486 -m32 -O1 -fomit-frame-pointer -fno-builtin \
-       -ffreestanding -fPIC $(SMP_FL) -fno-stack-protector
+       -ffreestanding -fPIC $(SMP_FL) -fno-stack-protector -fgnu89-inline

@@ -23,3 +23,2 @@
 all: clean memtest.bin memtest
-                scp memtest.bin root@

--- config.h    2015-11-18 23:49:27.696700200 +0100
+++        2015-11-19 00:08:55.799401157 +0100
@@ -19,3 +19,3 @@
 /* BEEP_MODE - Beep on error. Default off, Change to 1 to enable */
-#define BEEP_MODE 0
+#define BEEP_MODE 1

@@ -37,3 +37,3 @@
 /* SERIAL_BAUD_RATE - Baud rate for the serial console */
-#define SERIAL_BAUD_RATE 9600
+#define SERIAL_BAUD_RATE 115200

Either make those changes by hand or paste the patch into a file and apply it:

$ patch < fix.patch

Now build it:

$ make -j$(nproc)

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