Date: Sat, 15 Mar 1997 11:38:20 -0500 (EST) From: Drew Derbyshire <ahd@kew.com> To: ahd@kew.com, bde@zeta.org.au, j@uriah.heep.sax.de Cc: freebsd-bugs@freefall.freebsd.org Subject: Re: i386/2984: serial console speed goes to hell during boot Message-ID: <199703151638.LAA03690@fantasy-factory.net.kew.com>
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> From bde@zeta.org.au Fri Mar 14 10:50:53 1997 > Date: Sat, 15 Mar 1997 02:50:29 +1100 > From: Bruce Evans <bde@zeta.org.au> > To: ahd@kew.com, bde@zeta.org.au, j@uriah.heep.sax.de > Subject: Re: i386/2984: serial console speed goes to hell during boot > Cc: freebsd-bugs@freefall.freebsd.org > > >> > When booting the 2.2 GAMMA release using a serial console > >> > the output (to an IBM PS/1 previously successfully used > >> > for a serial console for 2.1.5-RELEASE for another 386), > >> > output is normal 9600 bps output until about the time the > >> > NPU is detected. Then, output slows to a crawl (~ 1 > >> > character/second) until shutdown ... the last two lines > >> > before reboot are printed at a normal speed (again), implying > >> > the hardware is (still) fine. > > Output interrupts must be broken. They may have always been broken, > but 2.1.5 polls for lost ones every 10 msec, so output goes out at at > least 100 cps, while 2.2 polls every second, so output goes out at at > least 1 cps. You can restore the 2.1.5 polling frequency by setting > the flag to recover sooner from lost output interrupts, or by not > using interrupts at all. See the sio man page. They be broke! Setting the flag bit results in reasonable output. However, it still doesn't work for input. I'll get the other system up to 2.2-something as well, see it if's broken _there_, and if so send more mail (I'll send mail anyway, so it doesn't turn into a lost interrupt). The current system hardware, or at least configuration, could be suspect, especially with the stray IRQ 7's, so I need a second data point for myself. -ahd-
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