Date: Mon, 12 Jan 1998 02:23:14 GMT From: jak@cetlink.net (John Kelly) To: dmaddox@scsn.net Cc: hackers@FreeBSD.ORG Subject: Re: 16650 Support(?) Message-ID: <34c17b19.7493033@mail.cetlink.net> In-Reply-To: <19980111194120.34679@scsn.net> References: <19980111150619.48677@scsn.net> <34b95e60.140553@mail.cetlink.net> <34B957B6.AEC4CDAF@scsn.net> <34bf6bef.3609890@mail.cetlink.net> <19980111194120.34679@scsn.net>
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On Sun, 11 Jan 1998 19:41:20 -0500, Charlie Root <root@scsn.net> wrote: >> There is more to the story because of the clock selection bit in the >> 650 UART, but the details should be irrelevant for your purposes. > >Interesting information... This card doesn't have a jumper for the >clockspeed, though. The only jumpers on the board are for setting the >IRQ and COM port. The clock is, as far as I can tell, fixed at 4x normal In that case a baud rate of 57,600 will cause SIO to program the UART with a "2" which will actually select 230,400. You may need to use Minicom or some other terminal program to set up your ISDN adapter at 230,400 first, though. My 3com cannot be autobauded to 230,400. It has to be initialized at 115,200 or below and then set to 230,400 with an AT command. Then after it's set, you can't talk to it again until you change your UART baud to 230,400. Since you seem to be running with a default 4x clock, the next lower standard speed in the 4x table is 38,400 which is programmed with a value of "12" in the UART register. If you set up Minicom at what appears to be 9600, you will really be talking to the ISDN device at 38,400. Then you should be able to use the AT command which sets the ISDN adapter to 230,400 and fire up SIO with a speed of 57,600 which will really be 230,400. It all makes sense when you see the baud rate table for 4x vs. 1x. John
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