Grub_badram

[strategus]

I have ECC memory which regularly has a correctable error at addr=0x3fdc1fcc0. I recalled that in the distant past, one could tell the Linux kernel to not use a section of memory via BADRAM and grub. I added

GRUB_BADRAM=0x3fdc1fcc0,0xffffc000

to /etc/default/grub, ran update-grub, and rebooted. I still get errors at that address and /proc/iomem doesn't show any "RAM buffer" entries.

So, does GRUB_BADRAM still work? I'm using the 5.15 kernel.

Did I specify the address corrrectly? Perhaps it needs to be page aligned or some such?

Thanks.

[strategus]

It's been a long time since I've done hex math, but I changed the grub line to

GRUB_BADRAM=0x3fdc1f000,0xffffc000

And now when I

sudo cat /proc/iomem

I see

3fdc1c000-3fdc1ffff : Unusable memory

which looks promising.
I assumed a page size of 4K. I dunno....

[strategus]

Well, the errors keep coming. Nuts.