Messages in this thread | | | Date | Wed, 27 Jan 1999 12:05:36 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: Big Fix for 2.2.1 |
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On Wed, 27 Jan 1999, Linux Lists wrote: > > Please don't do that. The Cyclades driver supports both ISA and PCI cards, > and it follows correctly the current definition, by ioremap'ing addresses > above 1MB and using readX/writeX for _all_ accesses to MMIO resources (in > ISA or PCI). Doing this change would mean having to test which card I'm > accessing _every time_ I do a readX/writeX, which is completelly > unacceptable (for obvious performance reasons).
Note that for drivers that already are PCI-aware, the trivial fix is to just make them _always_ ioremap() their area (whether it is in the ISA legacy region or not) and then use readX/writeX. That works now, and will always work - that's how ioremap() is supposed to handle it.
It's only for drivers that _only_ know about legacy ISA issues that this would be an issue.
Linus
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