Date: Tue, 12 Feb 2002 20:33:12 +0100 (MET) From: j@uriah.heep.sax.de (Joerg Wunsch) To: freebsd-scsi@freebsd.org Subject: Re: SCSI parity error detected Message-ID: <200202121933.g1CJXCF87301@uriah.heep.sax.de> References: <200202112125.g1BLPQN61061@uriah.heep.sax.de> <20020211002602.I2420-100000@gerard>
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Gérard Roudier <groudier@free.fr> wrote: >> This Dawicontrol is 8-bit only btw., despite of using an 53c875. > But the driver cannot guess it. And it doesn't understand the > Dawicontrol settings from NVRAM (if some exists). But don't we have a problem here then? The controller uses a chip that could do 16 bit, but has only an 8-bit bus attached. Since there's no NVRAM on it, there's no chance for the driver to tell this. As soon as another 16-bit capable device appears, this device would also try to negotiate 16-bit when asked for (since it doesn't know about the 8-bitness of its bus adapter), and there's no chance for user intervention to tell the controller to restrict everything to 8 bit. > OTOH, if there is no such message in the log, it could well be the > initial INQUIRY response that got a SCSI PARITY error. The problem > might then be the/a SCSI PARITY signal not being properly > driven/connected. What happens if the upper 8 bit are just terminated only on the controller? Would this generate a parity error? Sure, that controller looks fairly crappy by design to me (Frank meanwhile replaced it by a better one), but since we claim we support the entire Symbios Logic line, we IMHO should offer a method to fallback to safe defaults. (For -current, could perhaps be done in the device hints, but that'd cause a chicken-and-egg problem when installing.) -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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