Re: DEC PWS500au (MiataGL) EIDE Issues

[Jason Thorpe <thorpej%me.com@localhost>]

> On May 16, 2021, at 2:47 PM, Jason Thorpe <thorpej%me.com@localhost> wrote:
> 
> I’ll poke around …

Ok, I did a little poking.

The Cypress 82c693 is kind of an odd-ball chip… it was used in a few Alpha models… but not much else, as far as I can discern.  Among other things, its ISA interrupt controller is a little different (we already have code that handles this), but there are a lot of additional configuration registers for it that we don’t fiddle with.

I see some leads in the Linux driver that look promising.  I’m going to dig out the data sheet and do a little light reading.

> 
> -- thorpej
> Sent from my iPhone.
> 
>> On May 16, 2021, at 5:36 AM, Rhialto <rhialto%falu.nl@localhost> wrote:
>> 
>> On Sat 15 May 2021 at 21:27:33 -0400, Alexander Jacocks wrote:
>>> All,
>>> 
>>> I?m trying to install NetBSD 9.1 on my Personal Workstation 500au
>>> (MiataGL), and I?m running into EIDE issues. Whenever I try to access any
>>> attached EIDE disk (or SATA disk, with a SATA/IDE bridge) I get the
>>> following:
>>> 
>>> wd0c: device timeout reading fsbn 9 (wd0 bn 0; cn 0 tn 0 sn 0), xfer 38,
>>> retry 0
>>> cypide0:0:0: geometry timed out
>>> 
>>> This happens across a bunch of disks, with several different IDE cables,
>>> both 40 and 80 conductor.
>>> 
>>> Does anyone have any ideas?
>> 
>> This sounds very similar to a known issue with DMA not being able to
>> cross some boundaries (64 K?) in the Miata's chipset.
>> 
>> A simple solution is to turn off DMA for the built-in IDE.
>> At some point I plugged in a separate PCI IDE card to get around it in a
>> different way. There was this in my kernel config for NetBSD 1.6:
>> 
>> # ST506/ESDI/IDE devices
>> wd*     at      pciide0 channel ? flags 0xffc   # Use PIO mode 4, no DMA
>> wd*     at      pciide? channel ?               # Allow DMA on IDE cards
>> 
>> or this from 2.0:
>> 
>> # ATA (IDE) bus support
>> # atabus0 at ata0
>> atabus0 at cmdide0 channel 0
>> atabus1 at cmdide0 channel 1
>> atabus* at ata?
>> 
>> # IDE drives
>> wd*     at      atabus0 drive ? flags 0xffc     # Use PIO mode 4, no DMA
>> wd*     at      atabus1 drive ? flags 0xffc     # Use PIO mode 4, no DMA
>> wd*     at      atabus? drive ?                 # Allow DMA on IDE cards
>> 
>> That's the latest version I have on my Alpha though (and currently it is
>> unused in storage).
>> 
>> I do notice your message mentions "cypide0" and not "cmdide0" so maybe
>> it's a different issue.
>> 
>> -Olaf.
>> -- 
>> ___ Q: "What's an anagram of Banach-Tarski?"  -- Olaf "Rhialto" Seibert
>> \X/ A: "Banach-Tarski Banach-Tarski."         -- rhialto at falu dot nl

-- thorpej