esp_scsi QTAG in FAS216 (was Re: [PATCH 0/2] Experimental Amiga Zorro ESP driver)

Tuomas Vainikka
2013-09-12T15:36:12Z

On 09/11/2013 05:48 PM, Geert Uytterhoeven wrote:
> On Wed, Sep 11, 2013 at 12:12 PM, Michael Schmitz <schmitzmic@gmail.com> wrote:
>>> problem. Using PIO, only the first byte of the tag message comes through. It
>>> might not be esp_scsi's fault, but there seems to be an assumption that all
>>> devices support TCQ. Also, no SCSI-2 features seem to be enabled in the chip
>>> by esp_scsi.
>> I'd have to check with DaveM, but such an assumption might in fact exist.
> BTW, it would be nice to start CCing linux-scsi@vger.kernel.org and
> David S. Miller <davem@davemloft.net> on future discussions.
>
> Gr{oetje,eeting}s,
>
> Geert
>
>
Hello,

Does anyone have the register descriptions for the FAS216 chip? It would
seem that receiving only one byte during reconnect is perfectly normal
[1] unless SCSI-2 features are explicitly enabled (which esp_scsi
doesn't seem to be doing).

Also, looking at the timeout formulae in the old NCR53C9x.c driver, the
values would be different for FAS216. Why was this dropped from the
modern esp_scsi?

1. Page 2 in http://www.datasheetarchive.com/dl/Scans-030/ScansU9X12569.pdf

-Tuomas