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Xref: sserve comp.unix.bsd:2825 comp.os.linux:6549 comp.periphs.scsi:6397 Newsgroups: comp.unix.bsd,comp.os.linux,comp.periphs.scsi Path: sserve!manuel!munnari.oz.au!news.hawaii.edu!ames!haven.umd.edu!darwin.sura.net!convex!egsner!adaptex!adaptx1!neese From: neese@adaptx1.UUCP (Roy Neese) Subject: Re: Query: Drivers for AHA >1522< ? Organization: Adaptec Inc., Texas Date: Wed, 29 Jul 1992 20:41:24 GMT Message-ID: <1992Jul29.204124.20791@adaptx1.UUCP> References: <2A6B89E3.7DE5@tct.com> <adam.711725819@mcrware> In article <adam.711725819@mcrware> adam@microware.com (Adam Goldberg) writes: > chip@tct.com (Chip Salzenberg) writes: > > >And, just to make followups more likely, (3) what is the difference > >between the 1542 and the 1522? Perspiring minds want to know! > > The 1542 is a bus-mastering controller. This 1522 is not. That makes > the 1542 much faster (at least in a protected-mode OS like Linux, with > properly written drivers). > > Given this difference, my inclination is that modifying the 1542 driver > to work with the 1522 *could* be significant work. (Or not, depending > on how far-sighted Adaptec is). This would not be a trivial effort as the 1522 is a 1542 without a processor, which means the firmware on the 1542 moves to the local CPU, so the driver would be much bigger than the 1542 driver and the overhead would be much higher. --- Roy Neese Adaptec Senior UNIX/SCSI Software Engineer UUCP: convex!egsner!adaptex!neese Inet: neese%adaptex@cirr.com