[Intel-gfx] Question about latest skl_dmc_ver1_27.bin and kernel version.

[Paul Knopf]

I am trying to setup Intel's new open-source iHD driver on a Yocto
environment.

https://software.intel.com/en-us/articles/build-and-debug-open-source-media-stack

The documentation says that skl_dmc_ver1_27.bin is required. Their
documentation updates a symlink (skl_dmc_ver1.bin), as if the kernel loads
it, but starting at kernel 4.8, it stopped loading the symlink and instead
loads a specific version of the dmc (see here:
https://github.com/torvalds/linux/blob/v4.8/drivers/gpu/drm/i915/intel_csr.c#L48).
Is the Intel documentation accurate? It is confusing because the guide
refers to 4.14.16 specifically, which doesn't use the symlink file
skl_dmc_ver1.bin.

Any ways, I tried replacing skl_dmc_ver1_26.bin with skl_dmc_ver1_27.bin to
have the same effect, but I got a segfault on boot.

https://pastebin.com/amW9vDdC

Should I even bother updating the DMC? Should the iHD driver work on most
kernels, even with 1_26 version of DMC?

By the way, this is the kernel I am using (with Yocto).

https://github.com/intel/linux-intel-lts/tree/4.14/yocto/base/drivers/gpu/drm/i915

Any help would be greatly appreciated. There is no documentation on this
stuff.
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