amdgpu.ko crashes on Radeon Vega

[Hans Petter Selasky]

On 5/9/21 12:34 AM, George Mitchell wrote:
> I have (per dmesg): AMD Ryzen 3 2200G with Radeon Vega Graphics.
> (pciconf -lv reports:
> vgapci0 at pci0:6:0:0:     class=0x030000 card=0xd0001458 chip=0x15dd1002 
> rev=0xc8 hdr=0x00
>      vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
>      device     = 'Raven Ridge [Radeon Vega Series / Radeon Vega Mobile
> Series]')
> I am running FreeBSD 12.2-RELEASE-p6 r369558.
> I built amdgpu.ko from drm-fbsd12.0-kmod-4.16.g20201016_1.
> When I boot single-user, with only kernel, vboxdrv.ko, and sem.ko
> loaded, and I type "kldload amdgpu", I get about six or seven lines
> of output, ending with "pci i/o bar is not found."  After a couple
> more seconds, the screen goes blank and the machine is as frozen as
> can be, and I have to cycle power to recover.  I've tried all four
> combinations of hw.vga.textmode and hw.syscons.disable, but it
> crashes each time.  Help!                              -- George
> 

Hi,

If you hook up a USB serial adapter and redirect the console to it using:

hw.usb.ucom.cons_baud: 9600
hw.usb.ucom.cons_subunit: 0
hw.usb.ucom.cons_unit: -1


Then you might get the prints from the panic which is happening. Also 
try to build a kernel with debugging support to get an automatic core dump.

It is also recommended to try 13-stable. The DRM code there is much newer.

--HPS