Solved FirePro M5100 System hangs with amdgpu

I am testing a FreeBSD install on a Dell Precision M4800 with an AMD FirePro M5100 MXM video card. On a clean install of FreeBSD 11.2, the first thing I do is install graphics/drm-next-kmod, then add to rc.conf
Code:
kld_list="amdgpu"
On reboot, during the loading of the driver, the system hangs, and I have to power off the system. In the log, I am getting the following messages
Code:
Radeon/verde_me.bin: could not load firmware image, error 2
Radeon/verde_me.bin: could not load firmware image, error 2
Radeon/verde_ce.bin: could not load firmware image, error 2
Radeon/verde_ce.bin: could not load firmware image, error 2
Radeon/verde_rlc.bin: could not load firmware image, error 2
Radeon/verde_rlc.bin: could not load firmware image, error 2

I have tried using graphics/drm-stable-kmod, and have also tried in FreeBSD 12.0-BETA1, with the same result. I have re-installed using BIOS instead of UEFI, and no change. If I switch to the Intel driver, the system loads without issue.

Is this particular card not supported by the driver, or is there something else that I am missing?
 
I just installed 12.0-BETA2, and installed graphics/drm-devel-kmodand it is now "working." Working, as in, the system does not crash, and it appears to be loading the driver fine. X isn't working, but that's another issue. At least there is progress! Marking this as solved for now.
 
you have to manually tinker with xorg.conf.

Code:
    Identifier "AMD"
    Driver "amdgpu"
    Option "DRI" "3"
    Option "TearFree" "true"
 
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