On Fri, Jul 07, 2000 at 04:24:04PM -0700, Erik E. Fair wrote:
> On my PC164, I have an ATTO SCSI interface, which I'm using with 
> three SeaGate Ultra/Wide drives. It probes as follows:
> 
> siop0 at pci0 dev 9 function 0: Symbios Logic 53c875 (ultra-wide scsi)
> siop0: using on-board RAM
> siop0: interrupting at eb164 irq 3
> scsibus1 at siop0: 16 targets, 8 luns per target
> [...]
> scsibus1: waiting 2 seconds for devices to settle...
> siop0: target 0 using 16bit transfers
> siop0: target 0 now synchronous at 20.0Mhz, offset 15
> sd3 at scsibus1 target 0 lun 0: <SEAGATE, ST34371W, 0280> SCSI2 0/direct fixed
> sd3: 4148 MB, 5168 cyl, 10 head, 164 sec, 512 bytes/sect x 8496960 sectors
> siop0: target 1 using 16bit transfers
> siop0: target 1 now synchronous at 20.0Mhz, offset 15
> sd4 at scsibus1 target 1 lun 0: <SEAGATE, ST34371W, 0484> SCSI2 0/direct fixed
> sd4: 4095 MB, 5172 cyl, 10 head, 162 sec, 512 bytes/sect x 8388314 sectors
> siop0: target 2 using 16bit transfers
> siop0: target 2 now synchronous at 20.0Mhz, offset 15
> sd5 at scsibus1 target 2 lun 0: <SEAGATE, ST34371W, 0860> SCSI2 0/direct fixed
> sd5: 4095 MB, 5899 cyl, 10 head, 142 sec, 512 bytes/sect x 8388315 sectors
> 
> I note that this looks very similar to the output from "ncr" but not 
> quite. I wonder if the "ncr" driver is reporting MHz as MB/s when it 
> should not.

No, it reports the rigth speed. It's because ncr doesn't explicitely
enable the clock doubler (done by the BIOS on PCs), so you're
not getting Ultra, only wide.
It's one of the side effects of siop :)

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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