Date: Sat, 18 May 1996 15:51:06 -0700 From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org> To: "Johan Granlund" <johang@algonet.se> Cc: stable@FreeBSD.ORG Subject: Re: AHA2940UW with nonultra disks broke. Message-ID: <199605182251.PAA26365@freefall.freebsd.org> In-Reply-To: Your message of "Sun, 19 May 1996 01:33:40 -0000." <199605182236.AAA23054@hermes.algonet.se>
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>> The problem is that the 5.7MHz syncrate seems to be invalid when in Ultra >> mode. >Correcti think, according to the BIOS. Minimum syncrate is 10MHZ That only specifies where syncronous negotiation starts. The chip can do sync all the way down to 3.6MHz. >> The fix I'm working on now is to dynamically enable/disable ultra >> mode on a per device basis so that the entire range of sync rates are >> availible to all devices. > >Great, wonder why Adaptec wasn't thinking of that? They probably did. >> Although the driver worked before, it was >> improperly reporting 10MHz when the setting really resulted in 5MHz (Not >> all settings are clock doubled when in Ultra mode). > >Maybe i was unclear, but the target 0 disk is a fast/narrow SCSIdevice and >should sync at 10MHZ. The dmesg output was from the adapter in >NON-ULTRA mode. When in Ultra mode the SCSI bus was hanging after the >driver had put out the "speed" line. Perhaps I wasn't clear. You can't do 10MHz sync when the adapter is in Ultra mode. It looks like you can do 20, 16, 13.4, and 5. The old code used to report the 5 MHz entry as 10 because it assumed at all settings in ultra mode are clock doubled. The second dmesg output reported the disk at 5.7Mhz which was an entry I added recently but doesn't seem to function. >I also have a DAT tape that is sync. on 5MHZ (i didn't know that at >first). When setting the adapter in Ultra mode the driver correctly >said that 5.0 MHZ was too low and set it for async (4MHZ). Ok what is >a MHZ between friends. The problem was that when i was trying to use >the tape the driver went nuts and tried to fallforward to 5MHZ sync. >Lots of complaints of course. This was before the last patches and i >haven't tried it again. It should work fine in non-Ultra mode and will properly sync at 5MHz regardless of which mode you set in SCSI-Select as soon as I finish my changes. >___________________________________________________________ > >Internet: Johang@Algonet.se > >I don't even speak for myself > -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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