Fwd: Re : AT91RM9200 CF timing? (linux-pcmcia aka - Re: AT91RM9200 CF Ambicom WL1100C issue)

[Mathieu Deschamps]

Hello list,

I've thought it may help people forwarding this here and 
to confirm a successful Ambicom WL1100C-CF running 
on at91rm9200 based with 2.6.14.

----------  Forwarded Message  ----------

Subject: Re : AT91RM9200 CF timing? (linux-pcmcia aka - Re: AT91RM9200 CF 
Ambicom WL1100C issue)
Date: Monday 10 July 2006 11:02
From: Mathieu Deschamps <mathieu.deschamps at com2gether.net>
To: Steven Scholz <steven.scholz at imc-berlin.de>
Cc: linux-arm-kernel at lists.arm.linux.org.uk

Hello Steven,

BIT you wrote :

On Monday 28 November 2005 18:31, Steven Scholz wrote:
> Hi all,
>
> I would like to ask people who successfully using compact flash (IDE,
> WLAN) on AT91RM9200 boards to post the timing settings of the
> EBI_SMC2_CSR register, i.e. the lines after "AT91_SYS->EBI_SMC2_CSR[4]="
> in drivers/pcmcia/at91_cf.c:at91_cf_probe(). Please mention your bus
> clock as well.
>
> My board works fine with CF IDE cards. But I have trouble reading the
> CIS of some WLAN cards. I have to use more than 40 waitstates (!)
> (lowest 7 bits in SMC_CSR4). That equals 50 * 1/80MHz = 500ns (!).
>
> IMHO a value of 24 (=300ns) should be (more than) enough. Which works
> fine with IDE cards...
>
> Thanks a million for sharing your thoughts!
>
> --
> Steven
>
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I've finally made it across on 2.6.14 with my AT91RM9200  using
both IDE and WLAN CF and glad to say leaving at91cf.c implemented defaults
for EBI's parameters is fine fine. I guess it's usefull to raise waitstates
for IDE only since IO cards like WLAN make use of NWAiT signal to
slow down also when accessing CIS. But if you haven't had NWAIT
wired...

Thanks again for your inputs and suggestions
cdy,

Mathieu Deschamps
Com2gether Design Center
Electronic and Embedded Engineering Services
www.com2gether.net