Re: [PATCH] zorro_esp: increase maximum dma length to 65536 bytes

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Hi Michael,

Op zo 10 nov. 2019 om 03:36 schreef Michael Schmitz <schmitzmic@xxxxxxxxx>:
> I need to confirm this from a data book of the older (pre-fast)
> revisions of this chip family. but since as Kars also states, the core
> driver default for the 16 bit transfer size is 64k as well, I very much
> suspect the same behaviour for the older revisions.

According to ftp://bitsavers.informatik.uni-stuttgart.de/components/ncr/scsi/NCR53C90ab.pdf,
on the NCR 53C90A programming the transfer counter to 0 also means
64k. That's the oldest data book I could find.
But the Zorro driver assumes a fast variant of the chip anyway (the
clock frequency is hard coded to 40 MHz), so this point is a little
moot.

Kind regards,

Kars.



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