pgprot_writecombine & shub 1.x

From: Jesse Barnes <jbarnes_at_sgi.com>
Date: 2005-01-12 07:00:02
SGI sn2 systems based on SHub 1.x chipsets don't support the write combine 
attribute on PIO space, only regular memory space.  This is a problem because 
drivers often expect to map PIO space with certain memory attributes (e.g. 
the PCI mmap code, drm, fbmem, acorn video).  None of the calls to 
pgprot_writecombine are in performance critical paths, so would making 
pgprot_writecombine into a machine vector would be ok?  Comments?

Thanks,
Jesse
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Received on Tue Jan 11 15:02:15 2005

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