linux-kernel - [bug] Radeon 3900XT not switch to graphic mode on kernel 5.10

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Date:   Sun, 27 Dec 2020 21:39:55 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: [bug] Radeon 3900XT not switch to graphic mode on kernel 5.10

Hi folks.
I bought myself a gift a new AMD 6900 XT graphics card to replace the
AMD Radeon VII.
But all joy was overshadowed that this video card did not working in Linux.
Output on the my boot screen was ended with message "fb0: switching to
amdgpudrmfb from EFI VGA" and videocard not switched to graphic mode.
https://photos.app.goo.gl/zwpErNrusq9CNyES7

I suppose the root of cause my problem here:

[    3.961326] amdgpu 0000:0b:00.0: Direct firmware load for
amdgpu/sienna_cichlid_sos.bin failed with error -2
[    3.961359] amdgpu 0000:0b:00.0: amdgpu: failed to init sos firmware
[    3.961433] [drm:psp_sw_init [amdgpu]] *ERROR* Failed to load psp firmware!
[    3.961529] [drm:amdgpu_device_init.cold [amdgpu]] *ERROR* sw_init
of IP block <psp> failed -2
[    3.961549] amdgpu 0000:0b:00.0: amdgpu: amdgpu_device_ip_init failed
[    3.961569] amdgpu 0000:0b:00.0: amdgpu: Fatal error during GPU init
[    3.961911] amdgpu: probe of 0000:0b:00.0 failed with error -2

Can anybody here help me get firmware?
my distro: Fedora Rawhide
kernel: 5.10 rc6
mesa: from git 21.0.0 devel

Sorry for disturb and merry xmas.

--
Best Regards,
Mike Gavrilov.

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