[Bug 97088] [APL] [BAT] GuC firmware goes missing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97088

--- Comment #1 from david.s.gordon at intel.com ---
So to work out just what's happening here we need to know:
Is the correct version of the firmware present in the root filesystem, an dif
so where. We expect it to be /lib/firmware/i915/bxt_guc_ver8_7.bin

And incidentally, is it a binary file or a symlink to the binary? Although
they're generally equivalent, there are cases where symlinks will not be
followed (although the error would probably be -EACCESS rather than -ENOENT).

Secondly: is the binary also present in the ramdisk? lsinitramfs(8) can be used
to examine the contents of the initrd file, e.g.

$ lsinitramfs /boot/initrd.img-4.7.0-rc7-dsg-02211-g3b9ac6a-dsg-work-111 | grep
-i guc
lib/firmware/i915/skl_guc_ver6_1.bin

shows that on this SKL machine, we have only version 6.1 of the GuC firmware.

Thirdly, we need the mount table (/etc/fstab) so we know which device contains
the root filesystem, and therefore when it gets mounted.

And finally (for now) it would be useful to know what Kconfig options have been
selected, as these can affect ramfs, i915, and device probing in general.

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