In <20010427234818.A4145@antioche.eu.org>
bouyer@antioche.lip6.fr wrote:

> I've an interesting question: can a ESP100A on a SS20, running at 40Mhz,
> really do 10MB/s on the SCSI bus ?
> >From esp_sbus.c:
> 	        /* Min clocks/byte is 5 */
> 		sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5);
> So 40/8 -> 8Mhz, so 8MB/s
> Before merge of the fas support, my disk probed as (on thorpej_scsipi branch):
> sd0: Sync (124.0ns offset 15), 8-bit (8.064MB/s) transfers, tagged queueing
> 
> Now it probes at 10MB/s; and I suspect some of the problems with the
> esp driver comes from that (disk and controller arn't at the same speed).

I think all SS20s have ESP200, not ESP100A.

I guess there was a bug in esp_sbus.c:espattach() so
ESP200 was detected as ESP100A, and it was fixed in
rev 1.13 (on fas support integration).
---
Izumi Tsutsui
tsutsui@ceres.dti.ne.jp