Subject: Re: Migrating MI-SCSI-Code to pmax/PI-SCSI?
To: Simon Burge <>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
List: port-pmax
Date: 09/04/1999 14:24:33
In message <>
Simon Burge writes:
>Andreas Kotes wrote:
>> Hi!
>> any hints how to migrate MI-SCSI-Code to pmax/PI-SCSI (am I right with
>> that?) ? I'd still need a bad block scanner & remapper badly and would
>> port it myself, but any hints are greatly appreciated.
>Just a short note that I tried to get a pmax version of 'sdd' working,
>but after two filesystem-related panics in less than an hour, I'm going
>to give up :-(  If I can get a diskless setup working this week I'll
>have another go, but I don't want to kill my main dev. box...

hi Simon ,

Was this onan ioasic machine? I think the Mi scsi code assumes
it can do unbroken I/Os of more than 8k. Until we handle ioasic
DMA-pointer reloads, or split larger transkactions into piecss <= 8k,
very Bad Things will happen when the fs layer requests a read/write of more
than 8k.

I have no idea whether Michael or Nisihmura-san's code handles this.