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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