[HN Gopher] UEFI-Only Support for AMD Radeon RX 9000 Series Grap...
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UEFI-Only Support for AMD Radeon RX 9000 Series Graphics and Later
Author : doener
Score : 17 points
Date : 2025-03-04 14:09 UTC (3 days ago)
(HTM) web link (www.amd.com)
(TXT) w3m dump (www.amd.com)
| teach wrote:
| Honest question: who is still using BIOS (or I guess CSM mode)
| and why?
|
| I was a BIOS holdout, and even I switched to pure-UEFI _years_
| ago.
| Delomomonl wrote:
| I booted my arch Linux Kernel straight from UEFI 9 years ago :)
| ChocolateGod wrote:
| I still see it used commonly for VMs.
| Paianni wrote:
| All of my PCs except an old MacBook Pro have a BIOS, not UEFI.
|
| Two are from 2010, one from 2008, one from 1996.
| doener wrote:
| Do you use a modern graphics card in any of them?
| HankB99 wrote:
| I have an old server motherboard that does not support UEFI.
| Otherwise it still runs fine.
|
| I came here to ask why it matters to the GPU how the host
| boots. Does it need to load some drivers or firmware before the
| host OS? The only thing I found in the article was "... may
| lose access to important and necessary features of your
| motherboard,"
| wmf wrote:
| Resizable BAR (which doesn't exist on old pre-UEFI hardware
| anyway).
| diego_sandoval wrote:
| I used to use CSM mode because I didn't understand how UEFI
| worked, specifically the Boot Manager.
|
| My Boot Manager always ended up full of old entries of OSes
| that I had already deleted, and it caused some issues. This was
| not a problem in compatibility mode.
|
| But then I read an article [1] and learned how to manage the
| Boot Manager.
|
| Then I made a video [2] summarizing what I learned from the
| article.
|
| But to this day, I defend the point that UEFI is not a drop-in
| replacement for BIOS, because if you install and delete OSs
| frequently, you need to know how to manage the Boot Manager to
| avoid ending up with a mess.
|
| [1] https://www.happyassassin.net/posts/2014/01/25/uefi-boot-
| how...
|
| [2] https://www.youtube.com/watch?v=-V3VhP-MUwE
| hnuser123456 wrote:
| Nice, thank you! I stopped experimenting with OSes right
| around the time UEFI took over so I never would've known.
| jauntywundrkind wrote:
| Note Toms Hardware on this:
|
| > _Let 's make one thing clear, this does not mean that RDNA 4
| (and future) GPUs will not boot on older systems. AMD simply does
| not guarantee an optimal experience, stating that your GPU could
| be missing out on necessary features such as Smart Access
| Memory._
|
| https://www.tomshardware.com/pc-components/gpus/amds-new-rx-...
| jauntywundrkind wrote:
| Note Toms Hardware on this:
|
| > _Let 's make one thing clear, this does not mean that RDNA 4
| (and future) GPUs will not boot on older systems. AMD simply does
| not guarantee an optimal experience, stating that your GPU could
| be missing out on necessary features such as Smart Access
| Memory._
|
| And possibly compatibility or crashing issues, they continue on
| to say.
|
| https://www.tomshardware.com/pc-components/gpus/amds-new-rx-...
| kaszanka wrote:
| BAR resizing (which is all that Smart Access Memory means, as far
| as I can tell) is just done by the kernel writing some value to
| the right field in PCI configuration space, why would it require
| firmware support (and if so, why would CSM preclude that
| support)?
| wmf wrote:
| There are a lot of features that Intel has decided are
| "supposed" to be enabled by firmware and Windows just goes
| along with that. AMD copies Intel for compatibility of course.
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(page generated 2025-03-07 23:00 UTC)