Date: Wed, 19 Jul 2000 06:43:59 -0600 From: "Andrew M. Miklic" <miklic@attglobal.net> To: Mark Abene <phiber@radicalmedia.com> Cc: "Andrew M. Miklic" <miklic@ibm.net>, wilko@FreeBSD.ORG, FreeBSD-alpha mailing list <freebsd-alpha@FreeBSD.ORG> Subject: Re: parallel ports on alpha in 4.1? Message-ID: <3975A28F.963347D5@attglobal.net> References: <20000718201356.C2427@freebie.demon.nl> <3974A0E1.D7723C01@ibm.net> <20000718184319.D18832@radicalmedia.com>
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> I'm curious when you say more work was involved to use port 0x278 on the > NatSemi chip. Is it not like the SMSC chip where you can simply tell it > any i/o port you want? In short, no. Basically, there are 5 "modes" that you can put the PC873xx SuperI/O chips into, and these modes correspond to an address/irq combination. 2 of the 5 modes assume by default irq7, or can be told to assume for irq7 by default (corresponding to the address 0x3bc and 0x378), another assumes 0x278 but irq5, and the other 2 assume the defaults of irq7 with addresses of 0x278 and 0x378, but requires another bit to be twiddled, and I have not looked much at the functionality/implications of such a bit (and the current driver, as I found it, did not utilize the bit yet at all)... Andrew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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