Badram kernel flag alternative to use soldered Faulty Ram

[aikawa24]

Hi,
ive an 2014 MacBook Pro with 16Gig soldered Ram which has a faulty area between 1844MB and 1848MB

with nvram boot-args="maxmem=1844" ive managed to install Bigsur and no Problems occur but ive only 1,8GB Ram from 16GB left

on Ubuntu I can set GRUB_BADRAM="0x000000007384800,0xfffffffffffffc83" and I get my 16GB Ram without the 4MB faulty Area

is there anybody out there who knows the equivalent of the Grub Badram for MacOS?

there is an EfiUnusableMemory command but I don't know where to use it.

 

[ifrit05]

macOS has no badmem equivalent. There may be a way though, using this utility. It may work since it is made to run on FreeBSD, macOS is based on BSD.

You will have to compile it though and enable kmem in the bootargs to expose /dev/mem. Let me know if you want me to compile it for you.

 

[f54da]

Woah I didn't know osx actually supported /dev/mem and /dev/kmem without kernel extensions. Very neat.