Date: Sun, 1 Feb 1998 19:17:44 +1100 From: Bruce Evans <bde@zeta.org.au> To: ben@stuyts.nl, freebsd-smp@FreeBSD.ORG Subject: Re: Trouble with high-speed sio Message-ID: <199802010817.TAA03148@godzilla.zeta.org.au>
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>I've just added an additional (isa) uart board with two quad-speed 16550's to >my system. (Gigabyte 586DX with dual 166MMX). They are recognized by the >kernel: > >sio2 at 0x3e8-0x3ef irq 10 on isa >sio2: type 16550A >sio3 at 0x2e8-0x2ef irq 9 on isa >sio3: type 16550A > >and they seem to work fine, but I get a few disturbing console messages: > >sio3: 64 events for device with no tp This is harmless, but shouldn't happen. >sio2: 124 more interrupt-level buffer overflows (total 124) >sio2: 125 more interrupt-level buffer overflows (total 249) >sio2: 125 more interrupt-level buffer overflows (total 374) > >sio2 runs at 460 KBaud. (Kernel thinks 115 KB) >sio3 is unused / not-connected. 460000 bps is not supported. There is only enough interrupt-level buffering for 256000 bps at best. crtscts should reduce the flow to at most about 192000 bps if it works. Bruce
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