Fedora's memtest option doesn't work, but found something that seems to??

[Michael D. Setzer II]

I've noticed for a while running memtest from grub2 
menu just gives a blue screen and locks machine.

Had a similar issue running it from grub4dos, but found 
running syslinux memdisk and then running program 
worked, but exact same thing didn't work with grub2??
So, just tried using the iso versus the memtest.img 
extracted from it, and that comes up.

Manually modifed the grub.cfg by coping section that 
Fedora creates and making changes??
Have seen messages saying it was broken, but never 
found any fixes. So, not sure some can tell why? or if this 
would be useful to others to try??

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry 'Fedora Memtest memtest86+-5.31' {
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 
--hint-baremetal=ahci0,msdos5 --hint='hd0,msdos5'  fa908208-22bd-4031-b620-841498e0708c
    else
      search --no-floppy --fs-uuid --set=root fa908208-22bd-4031-b620-841498e0708c
    fi
    insmod bsd
    echo	'Loading Fedora Memtest memtest86+-5.31 ...'
    knetbsd	/elf-memtest86+-5.31
}
menuentry 'Memtest' {
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 
--hint-baremetal=ahci0,msdos5 --hint='hd0,msdos5'  fa908208-22bd-4031-b620-841498e0708c
    else
      search --no-floppy --fs-uuid --set=root fa908208-22bd-4031-b620-841498e0708c
    fi
    echo 'Loading memdisk'
    linux16 /memdisk iso
    echo 'Loading iso'
    initrd16 /memtest86+-5.31b.iso
}

### END /etc/grub.d/20_memtest86+ ###

[Tom Horsley]

On Sat, 08 Jan 2022 16:48:26 +1000
Michael D. Setzer II via users wrote:
> I've noticed for a while running memtest from grub2 
> menu just gives a blue screen and locks machine.

Memtest and EFI seems to be tricky. I had to download the EFI compliant
memtest86 (NOT memtest86+) and make a bootable usb stick to run
memtest on a new EFI only system I got.

[Michael D. Setzer II]

This is on a non-EFI system. Memtest use to work on my 
systems before (Have 5 Fedora 34 machine and the 
standard memtest started giving the blue screen when 
selecting memtest). The memtest worked fine with 
syslinux boot from flash, and use to work with grub4dos 
boot, but now that requires a memdisk setup to load it. 
Just was trying something similar with grub2.

With grub4dos use this in menu.lst
title memtest
find --set-root /MEMTEST.IMG
#Uses memdisk from syslinux 6.04pre1
kernel /memdisk
initrd /MEMTEST.IMG

in /boot/grub2/grub.cfg use
menuentry 'Memtest' {
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 
--hint-baremetal=ahci0,msdos5 --hint='hd0,msdos5'  fa908208-22bd-4031-b620-841498e0708c
    else
      search --no-floppy --fs-uuid --set=root fa908208-22bd-4031-b620-841498e0708c
    fi
    echo 'Loading memdisk'
    linux16 /memdisk iso
    echo 'Loading iso'
    initrd16 /memtest86+-5.31b.iso
}

Have tried a little with EFI, but haven't found a way since it doesn't like memdisk??

On 8 Jan 2022 at 10:43, Tom Horsley wrote:

Date sent:      	Sat, 8 Jan 2022 10:43:40 -0500
From:           	Tom Horsley 
To:             	[e-mail]
Subject:        	Re: Fedora's memtest option doesn't work, 
but found something that
    seems to??
Send reply to:  	Community support for Fedora 
users
> On Sat, 08 Jan 2022 16:48:26 +1000
> Michael D. Setzer II via users wrote:
> > I've noticed for a while running memtest from grub2 
> > menu just gives a blue screen and locks machine.
>
> Memtest and EFI seems to be tricky. I had to download the EFI compliant
> memtest86 (NOT memtest86+) and make a bootable usb stick to run
> memtest on a new EFI only system I got.
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