[Bug 268962] graphics/drm-510-kmod: amdgpu.ko doesn't load properly from loader.conf

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268962

            Bug ID: 268962
           Summary: graphics/drm-510-kmod: amdgpu.ko doesn't load properly
                    from loader.conf
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: george@m5p.com
             Flags: maintainer-feedback?(x11@FreeBSD.org)
          Assignee: x11@FreeBSD.org

When I include:

amdgpu_load="YES"
amdgpu_name="/boot/modules/amdgpu.ko

in my /boot/loader.conf, it loads amdgpu.ko, and also loads drm.ko,
linuxkpi_gplv2.ko, dmabuf.ko, and ttm.ko (which I hypothesize happens because
the top Makefile specifies:

DEFAULT_KMODS=  dmabuf          \
                linuxkpi        \
                ttm             \
                drm             \
                amd             \
                radeon

But in order to work, we also need firmware for my graphics card to load, which
means amdgpu_raven_{gpu_info,sdma,asd,ta,pfp,me,ce,rlc,mec,mec2,vcn}_bin.ko
also have to be loaded in my case.  And they are, if I kldload amdgpu.ko by
hand in single-user mode or include amdgpu.ko in kld_list in my /etc/rc.conf. 
(And in that case, X windows comes up nicely using the "amdgpu" driver, whereas
otherwise it comes up in VESA mode.)

In conjunction with bug #267028, it would be nice if I could load amdgpu.ko at
/boot/loader.conf time, since loading it later on increases the chance of a
kernel crash in ZFS code.  Don't ask me why.

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