pcmcia-cs for 8xx

pcmcia-cs for 8xx

[Magnus Damm]

Hello all,

What's the status about the 8xx pcmcia controller?

I've played around with my FADS board and boot software.
The pcmcia stuff works pretty fine. 

I did a small hack half a year ago to use my pcmcia-ata
disk as root filesystem using the ide code in Linux.
That wasn't such a generic solution...

Wouldn't it be nice to use the pcmcia-cs package?
Anyone done that already?

I saw some messages floating around about RPXLite 823.
Is there anything I should know before I start digging?

TIA /

Magnus

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Re: pcmcia-cs for 8xx

[Mark S. Mathews]

I'm not aware of pcmcia-cs for 8xx, we just have some kernel routines that
we wrote to initialize the 8xx pcmcia registers.  They're not as generic
as I'd like yet, but you're welcome to them.

One thing to beware: We had a problem w/ bus errors (machine check) when
accessing (read and write) the common memory and I/O space on our card.
Dan believes this may have to do with TLB misses.  He thought pinning the
TLB entries for the pcmcia space might fix it.  Unfortunately, we haven't
had the time to try it yet.  Our temporary workaround was to ignore
machine checks generated from pcmcia addresses.

-Mark

On Wed, 29 Dec 1999, Magnus Damm wrote:

> 
> Hello all,
> 
> What's the status about the 8xx pcmcia controller?
> 
> I've played around with my FADS board and boot software.
> The pcmcia stuff works pretty fine. 
> 
> I did a small hack half a year ago to use my pcmcia-ata
> disk as root filesystem using the ide code in Linux.
> That wasn't such a generic solution...
> 
> Wouldn't it be nice to use the pcmcia-cs package?
> Anyone done that already?
> 
> I saw some messages floating around about RPXLite 823.
> Is there anything I should know before I start digging?
> 
> TIA /
> 
> Magnus
> 


Mark S. Mathews

AbsoluteValue Software     Web:    http://www.absoval.com
P.O. Box 941149            e-mail: mark@absoval.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


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Re: pcmcia-cs for 8xx

[Dan Malek]

Mark S. Mathews wrote:
> 
> I'm not aware of pcmcia-cs for 8xx, we just have some kernel routines that
> we wrote to initialize the 8xx pcmcia registers.  They're not as generic
> as I'd like yet, but you're welcome to them.


How about if I combine these with functions I have, and try
to make something generic for low-level RPX-Lite boards?  At
least it is a starting point and we can improve it over time.


	-- Dan

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Re: pcmcia-cs for 8xx

[Dan Malek]

Magnus Damm wrote:

> What's the status about the 8xx pcmcia controller?

The hardware seems to work (mostly...).


> Wouldn't it be nice to use the pcmcia-cs package?


Maybe.  I have discussed this with several people over the
past year.  None of the product requirements I have seen
for 8xx PCMCIA need the capabilities of the pcmcia-cs.  They
didn't require hot swap or a variety of cards supported.  They
all fit a card before power up and it never changed.  All of
the projects I have done were "need it yesterday", so I just
used minimal functions to map the PCMCIA and get on with life.
I never had the time to port the pcmcia-cs package.  In the
embedded system, they didn't want the overhead of module
support programs, so these are also compiled kernel drivers.
The whole of pcmcia-cs assumes modules.

One difficulty with the PCMCIA on the 8xx is all board designs
I have seen use different power control methods, so the modifications
would include board specfic functions for this.

> Anyone done that already?

Not that I am aware.


> I saw some messages floating around about RPXLite 823.

Mark Mathews has wireless PCMCIA cards working, with some
weird hardware difficulty.

I have done several types of Flash card and some things I
can't talk about yet on the RPX-Lite PCMCIA.

> Is there anything I should know before I start digging?

There are lots of hardware variations.  The 860 has two PCMCIA
ports, sometimes boards use both or only one.  The 823/850 have
only PCMCIA B.  There are the pin multiplexing issues for the
8xx and the PCMCIA.  Some board designs intend to use PCMCIA,
but failed because they used the pins in a way that precludes
mapping them to the PCMCIA.

If you intend to do this, make sure you post your intentions
and progress.  I may make some of my time available to help out,
I just can't take on the whole project.


	-- Dan

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