> As in an MMIO aperture? If its MMIO on the bus you should be able to
> just call ioremap with the bus address. By nature of it being outside
> of real ram, it should automatically be uncached (unless you've set an
> MTRR over that region saying otherwise).
It's not outside of real RAM. The device is inside real RAM (it sits on the
DIMM itself), but I need to poke through the entire 4GB range to see how it
responds.
> Look at the functions agp_generic_free_gatt_table and
> agp_generic_create_gatt_table in agpgart_be.c (drivers/char/agp). They
> do the ioremap_nocache on real ram for the GATT/GART table.
Unfortunately, the memory they remap is allocated:
table = (char *) __get_free_pages(GFP_KERNEL, page_order);
...
CACHE_FLUSH();
agp_bridge.gatt_table = ioremap_nocache(virt_to_phys(table), (PAGE_SIZE * (1 <<
page_order)));
CACHE_FLUSH();
I've searched high and low for examples of code that does what I do, and I
can't find any.
-- Timur Tabi - ttabi@interactivesi.com Interactive Silicon - http://www.interactivesi.comWhen replying to a mailing-list message, please direct the reply to the mailing list only. Don't send another copy to me.
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