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cardbus: limit IO windows to 256 bytes

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That's what we've always historically done, and bigger windows seem to
confuse some cardbus bridges. Or something.

Alan reports that this makes the ThinkPad 600x series work properly
again: the 4kB IO window for some reason made IDE DMA not work, which
makes IDE painfully slow even if it works after DMA timeouts.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-10-23 16:31:16 -07:00
parent 9092b20803
commit 4196c3af25
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/setup-bus.c
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@ -40,7 +40,7 @@
* FIXME: IO should be max 256 bytes. However, since we may
* have a P2P bridge below a cardbus bridge, we need 4K.
*/
#define CARDBUS_IO_SIZE (4*1024)
#define CARDBUS_IO_SIZE (256)
#define CARDBUS_MEM_SIZE (32*1024*1024)
static void __devinit