[Bug 97621] [BAT] [SKL] System boots with [drm:i915_stolen_to_physical] *ERROR* conflict detected with stolen region: [0xc6000000 - 0xc8000000] on dmesg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97621

Joonas Lahtinen <joonas.lahtinen at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #13 from Joonas Lahtinen <joonas.lahtinen at linux.intel.com> ---
Thanks to Tomi for using DediProg to flash older bios for the dmesg and
/proc/iomem dumps. They are on exactly the same kernel and machine.

There's no difference between 1805 and 2002, which brings us to the conclusion
that OEM updated the memory mapping between 0704 and 1805 and since then there
is a BIOS reservation from PNP 00:07 conflicting with stolen memory area;

$ cat /sys/bus/pnp/devices/00\:07/firmware_node/path
\_SB_.PCI0.PDRC

PNP device 00:07 previously claims the same memory areas (with exact addresses
matching) in 0704 and the more recent ones, but there's that additional
reservation in iomem (c5400000-c7fffffe : pnp 00:07) which conflicts with
stolen.

I would classify this as UEFI vendor bug (could be our VBIOS too), because we
have no obvious way of correlating the reservation to stolen memory. The
claimed stolen memory resolution happens to be in the middle of the reservation
and no way aligned.

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