Messages in this thread | | | Date | Thu, 11 Sep 2003 09:14:50 -0700 | Subject | Re: Memory mapped IO vs Port IO | From | (Jesse Barnes) |
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On Thu, Sep 11, 2003 at 05:01:16PM +0100, Matthew Wilcox wrote: > config MMIO > bool "Prefer Memory-mapped I/O accesses over Port I/O" > help > Many devices are accessible via both memory mapped I/O and > port I/O. Say Y here to access them via the slightly faster > memory mapped I/O method. If you experience problems, you may > wish to say N here. > > If that's not acceptable, can I suggest that we at least ask a standard > question? > > config WWWW_MMIO > bool "Use Memory mapped I/O in preference to Port I/O" > depends on WWWW > help > This device's registers can be accessed by either memory > mapped I/O or port I/O. Memory mapped I/O is faster, so you > are advised to say Y here. > > (yes, we could wordsmith these questions into the ground; the key point > of this mail is whether we ask one question at the start of configuration > or whether we ask one question per device.)
I like this idea, esp. as a global option. It would help e.g. visws which can't reliably do MMIO. Most platforms could default MMIO to y also, to make things easier.
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