Date: Sun, 11 Feb 1996 21:15:51 +1100 From: Bruce Evans <bde@zeta.org.au> To: bugs@freebsd.org, dbacher@dayton.net Subject: Re: Can't locate 16450 UART when turbo engaged Message-ID: <199602111015.VAA04847@godzilla.zeta.org.au>
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>This is a minor problem that I am going to fix on my own, but a 16450 >UART appears to be detected ONLY when the processor (486DX4/100 AMD) is >running in slow mode. BIOS I/O settings do NOT help, Cache settings do >NOT help. Is it a real 16450? >I believe that this is caused by an incorrect delay loop (most >likely processor dependent) in your detection code. This is the only >explanation as to why the UART works fine (and is correctly autodetected) >under PC-DOS 7 and OS/2 Warp, but is misidentified by FreeBSD. The sio driver has timing problems with internal modems, but these are because there are no delay loops at all in certain places. Bruce
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