aic7895 - 5.0.7 bleibt stehen
Justin T. Gibbs
gibbs at narnia.plutotech.com
Sun Mar 15 08:56:27 PST 1998
In article <199803150318_MC2-36C3-F22C at compuserve.com> you wrote:
> By the way, at boot time the driver writes:
> ....
> (scsi0:0:-1:-1) Scanning channel for devices.
> (scsi0:0:0:0) Using wide (16 bit) transfers.
> (scsi0:0:0:0) Synchronous at 20.0MHz, offset 8.
> Vendor: IBM Model: DCAS-34330W Rev: S65A
> Type: Direct Access ANSI SCSI revision: 02
> Detected scsi disk sda at scsi 0, channel 0, id 0, lun 0
> ....
>
> Why did the driver limit the synchronous transfer to 20 MHz? I think it
> should be 40 MHz? The BIOS is enabled to run the drives at 40, but you
> don't use it (?).
The BIOS allows you to configure the card to attempt to negotiate 40MB/s
transfers. It has done that by setting the transfer rate to 20MHz (the
fastest an Ultra controller can go) and transfering two bytes at a time.
--
Justin
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