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From: bde@zeta.org.au (Bruce Evans)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: UUCP on ASUS P55TP4N
Date: 30 Sep 1996 17:49:17 +1000
Organization: Kralizec Dialup Unix
Lines: 45
Message-ID: <52nu1t$8cc@godzilla.zeta.org.au>
References: <DyEyAF.8I@acme1.ruhr.de>
NNTP-Posting-Host: godzilla.zeta.org.au
In article <DyEyAF.8I@acme1.ruhr.de>,
Christoph Haas <chris@acme1.ruhr.de> wrote:
>I'm succesfully running FreeBSD 2.1.5-STABLE on my old 486/100. Taylor UUCP can use the modem on /dev/cuaa1 (which is an onboard multi-i/o chip) without any problems. Now I moved to a new system based on an ASUS P55TP4N. The kernel detects 2 serial ports and I can use both of them with a mouse in X11 (so the hardware seems to be ok). When I start a ppp session with a modem conected to one of the ports, everything seems to be allright, but when I try to use UUCP on this port, I get tons of errors (bad chec
k
>sums, missing packets etc.). Is there a known bug in the sources (maybe the sio drivers) or on the board ?
This is a known bug in the UART used on some ASUS P55TP boards. It shows
up mainly under uccp and gdb-remote because they make (usually null) changes
to the UART settings while data is arriving. Try the enclosed work-around.
It makes null changes harmless.
diff -c2 sio.c~ sio.c
*** sio.c~ Sat Sep 14 19:30:41 1996
--- sio.c Mon Sep 30 15:26:21 1996
***************
*** 1937,1943 ****
if (divisor != 0) {
outb(iobase + com_cfcr, cfcr | CFCR_DLAB);
! outb(iobase + com_dlbl, divisor & 0xFF);
! outb(iobase + com_dlbh, (u_int) divisor >> 8);
}
outb(iobase + com_cfcr, com->cfcr_image = cfcr);
--- 1956,1975 ----
if (divisor != 0) {
+ u_char dlbh;
+ u_char dlbl;
+
outb(iobase + com_cfcr, cfcr | CFCR_DLAB);
! /*
! * Only set the divisor registers if they would change,
! * since on some 16550 incompatibles (UMC8669F), setting
! * them while input is arriving them loses sync until
! * data stops arriving.
! */
! dlbl = divisor & 0xFF;
! if (inb(iobase + com_dlbl) != dlbl)
! outb(iobase + com_dlbl, dlbl);
! dlbh = (u_int) divisor >> 8;
! if (inb(iobase + com_dlbh) != dlbh)
! outb(iobase + com_dlbh, dlbh);
}
outb(iobase + com_cfcr, com->cfcr_image = cfcr);
--
Bruce Evans bde@zeta.org.au