Date: Fri, 11 Jul 1997 17:26:26 +0200 From: Poul-Henning Kamp <phk@dk.tfs.com> To: Bruce Evans <bde@zeta.org.au> Cc: phk@dk.tfs.com, danny@panda.hilink.com.au, freebsd-hardware@FreeBSD.ORG, freebsd-isp@FreeBSD.ORG, sdudley@byterunner.com Subject: Re: Configuring Byterunner TC-800 high speed 8-port serial card Message-ID: <7442.868634786@critter.dk.tfs.com> In-Reply-To: Your message of "Fri, 11 Jul 1997 01:55:39 %2B1000." <199707101555.BAA11291@godzilla.zeta.org.au>
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In message <199707101555.BAA11291@godzilla.zeta.org.au>, Bruce Evans writes: >>Speaking from experience: a correctly configured board fails the test#3 >>after a crash. Don't ask me why, but it is correctly configured, and >>I have verified the circuitry on the card myself, to make sure that it >>was possible to share the IRQs with this card. > >Does OUT2 (aka MCR_IENABLE) disconnect the UARTs individually, as is >required for the non-AST multiport case? The card has 4 separate chips, genuine NS16550AN even, and at the irq output of each chip is an open-collector driver, the output of these are run to a forest of jumpers, where they in this case all end up on the same line, which goes to a 3-state driver and on via another jumper forest to IRQ-10 on the ISA bus. There is in other words nothing common for the chips, except the address decode & the above mentioned IRQ routing circuit. >For the non-multiport case, I have seen some cases where test #3 fails >but then succeeds when retried from ddb after a few seconds. This may >have something to do with the fifo not being initialized early. I've >only seen it after crashes. I've only seen this problem after crashes too. I have tried declaring the master on the first or the last port, and if I remember right, one of the settings is slightly less prone to fail, but right now I can't remember which. I can check this fact if it seems important to you... -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc. Power and ignorance is a disgusting cocktail.
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