Hello, Michael.
On Wed, Aug 21, 2024 at 12:37:53 +0100, Michael wrote:
> On Wednesday, 21 August 2024 12:15:22 BST Alan Mackenzie wrote:
> > Hello, Peter.
> > On Tue, Aug 20, 2024 at 23:16:39 +0200, Peter Böhm wrote:
> > > Hello Alan,
> > > > Anyhow, I'm up to the stage of configuring the kernel, and I'm stuck at
> > > > the bit where I need to specify the firmware to be incorporated into the
> > > > kernel for the integrated graphics processor.
> > > Yes, you surely will need some firmware files for your GPU of your AMD
> > > CPU. The easiest way to find out what you need is:
> > > Boot with our GentooLiveCD (*) and ask:
> > > "dmesg | grep firmware"
> > I've done that, and see just three firmware files:
> > regulatory.db
> > regulatory.db.p7s
> > rtl_nic/rtl8125b-2.fw
> > .. The first, according to file, is a wireless regulatory database file.
> > The second is some variant of this, I think a signed version or
> > something. The third is surely firmware for my Realtek 8125 Ethernet
> > chip.
> > That's not yet got me very far.
> You'll need the above if you using WiFi, but for your graphics can you please
> take a look/share the output of:
> lspci | grep -i VGA
I've tried that already. I get
VGA compatible controller, Advanced Micro Devices, Inc [AMD/ATI] Raphael
(rev c4)
, which fails to identify the GPU cores. Raphael, I believe, is just the
code name for the entire processor.
> and
> lshw -C cpu
> lshw -C display
They don't give me any more information, either.
> The above will show which APU you are using and its GPU cores. Then it is a
> matter of looking here for the corresponding GPU chipset and
> microarchitecture
> you need to enable in the kernel:
> https://wiki.gentoo.org/wiki/AMDGPU#Feature_support
I've tried that already. "Raphael" does not appear in that document.
> before you check what firmware blobs you also need to include, from this
> table:
> https://wiki.gentoo.org/wiki/AMDGPU#Firmware_blobs_for_a_known_card_model
That is my problem - discovering the "known card model" for my Ryzen
7900. The Gentoo documentation doesn't appear to deal with this case,
and my three hour web search yesterday turned up nothing useful.
> Alternatively, as Wol mentioned, you can set up your kernel graphics drivers
> as modules (temporarily) and inspect dmesg to find out what firmware is being
> loaded. Then use this information to add the firmware file names to be built
> in the kernel and also configure to be built-in any kernel graphics drivers.
That would involve me learning how to make and handle a modular kernel,
something I'd really rather not have to do. Why is the identity of the
necessary firmware for Ryzen APUs such a closely guarded secret?
--
Alan Mackenzie (Nuremberg, Germany).
