Re: MTRR setting and framebuffer driver

Jeff Garzik (jgarzik@pobox.com)
Mon, 13 Sep 1999 21:23:48 -0400

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Previous message: Alan Cox: "Re: who is planning to develop a usb net adapter driver?"
Maybe in reply to: Jamie Lokier: "MTRR setting and framebuffer driver"

Jamie Lokier wrote:
> I would like either vesafb, or the MTRR driver to realise that this
> 2.5MB region is a sub-region of the 4MB region that won't be used by
> anything else, so it is safe to allocate a 4MB write-combining MTRR.
>
> Richard, is this possible now that we have the resource tree to examine?
> Perhaps it is possible to generically permit rounding an MTRR range,
> provided the extra address space is not used in the resource tree, and
> if this condition changes in the tree, to remove the MTRR.

IMHO this should be done in vesafb, possibly based on the value passed
to __request_region().

Jeff

-- Custom driver development | Never worry about theory as long Open source programming | as the machinery does what it's | supposed to do. -- R. A. Heinlein

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Previous message: Alan Cox: "Re: who is planning to develop a usb net adapter driver?"
Maybe in reply to: Jamie Lokier: "MTRR setting and framebuffer driver"