Alan wrote:
On Tue, 28 Nov 2006 09:00:44 -0500
Mark Lord <mlord@xxxxxxxxx> wrote:
Alan, I confess that I really don't understand this example (below).
Can you try again, with something concrete enough for a rusty old
IDE hacker to understand?
The asynchronocity isn't at the IDE level - its at the PCI bus level. The
IRQ path between a PCI card and the CPU is not synchronous to I/O cycles.
Yes, I know that much already.
But how does that factor into the need for this particular patch,
(apart from truly buggy drives which send the IRQ before clearing BUSY) ?
The device driver won't do ANY I/O until it sees the IRQ,
so things are synchronized already without needing to do
an extra status poll in response to the IRQ.
???
Thanks
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