Hi,
On Sun, 12 Sep 1999, Mark van Doesburg wrote:
> I tried implementing a vmalloc_uncached (with the help of
> Russel) but unfortunately, virt_to_bus can't get the physical
> address of a vmalloc'ed area, and I didn't want to walk the page
> tables.
>
> I had to stop hacking on this (more urgent work to do), but I
> beleive there is still the possibility to use the low-level
> _ioremap function to create a second, uncachable, mapping for a
> given kmalloc'ed region. If you make sure to invalidate it once,
> and then only use the address returned by _ioremap, this should
> work.
>
> I'll do more experiments with this next week,
>
> A student here at the UT told me he had this working last week. I didn't
> have the time yet to test it but I hope I'll be able to test it this
> week.
>
For uncacheable memory, I talked with Phil Blundell about this, and he
pointed me at the framebuffer for the sa1100 linuxarm port. I pulled
the bits out of there that grabbed memory in the kernel and marked it
uncacheable, and made it a separate routine. I haven't tested it yet
other than to verify the call suceeds and memory is returned. I can
post the routine to the list if anyone is interested.
--
Kyle Mestery | StorageTek's Storage Networking Group
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