Date: Wed, 26 Jul 2000 13:25:22 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: David Greenman <dg@root.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, "Koster, K.J." <K.J.Koster@kpn.com>, "'FreeBSD Alpha mailing list'" <freebsd-alpha@FreeBSD.ORG> Subject: Re: fxp0 hangs my AXPpci33 Message-ID: <Pine.BSF.4.05.10007261321030.18265-100000@semuta.feral.com> In-Reply-To: <200007262005.NAA02751@implode.root.com>
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> >I think that the SEEPROM reading might be very timing > >dependant... David? I'm worried that whatever the path in the chipset > > It is timing dependant, but the driver inserts more than enough delay > by using DELAY(1) for 1us. I think the requirement is much much less than > that (< .5us), so if timing really is the problem, then it leads me to wonder > if DELAY() might be somewhat broken on Alpha for small delays. A quick way > to test for that would be to change the DELAY(1)'s to DELAY(10) or more. It shouldn't be. It's using the rpcc register to do more precise timing. It *used* to be about 30% off, but now should be quite accurate- but it's certainly possible. I'll be interested in hearing this. I forget- is this with 4.0 or with -current/4.1? I seem to recall that this source base is a recent source base change even for 4.1- (July 4th). -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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