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ReBarUEFI: Resizable BAR for almost any UEFI system

ReBarUEFI: Resizable BAR for almost any UEFI system

nateb2022

Comments (44)

  • abrookewood
    FYI: Resizable BAR (Base Address Register) is a PCI Express feature that removes the traditional 256MB memory limit, allowing your CPU to access your graphics card's entire VRAM at once for a potential 5% to 15% boost in gaming performance
  • zir_blazer
    These kind of BIOS modding shenannigans is why I got interesed in Coreboot, so that enhancing a Firmware capabilities becomes possible without touching propietary tools/code.Other similar mods included adding NVMe Boot capabilities to older Firmwares that didn't supported them so that you could boot from modern NVMe drives if you used some kind of adapter (As none of those Motherboards have M.2 Slots, but you can use them with a PCIe-to-M.2 adapter card). Also adding required stuff to get certain CPUs booting in Motherboard that were never officially supported (Depending on generation, could be as simple as adding new CPU Microcode).
  • bigwheels
    What does this do? I perused the README but I'm still clueless on what the purpose and use-case is for ReBAR.(Posting this under the assumption others will also appreciate a bit of quick context.)
  • marcus9999
    this fixes a real annoyance on older workstation boards where above 4g decoding is a requirement but the option isn't even in the bios menu. saw a build recently on an x79 board where it had to be exposed with a hand patched bios before anything like this or a modern gpu would work at all.
  • Melatonic
    Should I be enabling this on a workstation setup doing ML ? Mostly GPU protein folding
  • gregoryl
    Tempted to see if this will work on the work dell laptop, which hardware supports rebar, but Dell just can't be assed to enable it - use an external ARC GPU to properly support 3 screens (again, Dells awful drivers / firmware - the same hardware supports 3 screens just fine).
  • anon
    undefined
  • suprjami
    I am in need of this from the opposite direction - an RTX 3080 20G BIOS which adds ReBAR to the card.Claude tells me the BAR is outside the encrypted part of the card firmware so theoretically should be possible?