Re: [iPAQ] Ipaq Pcmcia 2fast4you ?

On Tue, Apr 17, 2001 at 09:08:55AM +0200, Gerd Prillwitz wrote:
>
> I have a Pcmcia jacket now for a while and I have made the experience that
> in standard mode a lot of cards will only be detected by accident.
> My experience is that the Pcmcia IF is maybe too fast for most of the cards.
> (System bus on most notebooks is < 100Mhz!) we have 206 Mhz.
> I need to scale the Cpu down to less than 100Mhz to detect most of the
> cards.
> So most of the time it works to "echo 7 > /proc/scale" or use the menu from
> familar v04. There is a way to configure the Pcmcia speed through an option
> in /etc/sysconfig/pcmcia but familiar does not have this file !

Hey, thanks!!

This solved my PCMCIA problems that I had reported earlier.

Specifically, the Linksys card which hung the system until I ejected
it now works with after I do "echo 7 > /proc/scale", and the problem
reappears if I reset /proc/scale with "echo 10 > /proc/scale".

Similarly, the WaveLan cards which failed to work before now work
only if I've run the command "echo 7 > /proc/scale".

So was this a bit of lore that everyone else knew? Was I just
unlucky? Also, does this work by actually slowing down the CPU? If
so, it seems kinda a lose that I'm going to have to slow down the
(already not-terribly-blazing-fast) ARM processor just to keep the
PCMCIA card happy.

Also, I tried looking in the stock Linux 2.4.3 kernel sources and
couldn't find where /proc/scale is getting set up. I assume this is
an arm/iPAQ kernel special?

                                                - Ted
Received on Tue Apr 17 12:24:28 2001