GNU Grub 2.04 does have memtest86+ that could be used to perform RAM load tests. Below are some lines to enable testing from within the Linux OS:
# Install the memory tester
sudo apt install memtester
# Perform the RAM test
testSize=100MB
iterations=1
sudo memtester $testSize $iterations
# Sample result
ramtest@linuxbox:~$ sudo memtester $testSize $iterations
memtester version 4.5.0 (64-bit)
Copyright (C) 2001-2020 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffffffffffff000
want 200MB (209715200 bytes)
got 200MB (209715200 bytes), trying mlock ...locked.
Loop 1/1:
Stuck Address : ok
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok
8-bit Writes : ok
16-bit Writes : ok
Done.
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