Re: McSPI3 on the BeagleBoard

[Philip Balister <philip@balister.org>]

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Gregoire Gentil wrote:
> Philip,
> 
> I found the patch. Thanks. SPI3 is working for me too but I think that
> there are a couple of errors:
> 
> - first, in the patch you posted on the beagleboard mailing list, you
> don't setup CS0 and CS1 pins in u-boot. I think that you should do it.

Yeah. I wanted to get the info out quickly since there are a couple of 
longish threads on the Beagle list over the problem.

> - secondly, you have added more mux configuration in the kernel for SPI3
> that should not be SPI3 but those new ones are wrong as they are
> competing with some USB pins. It's the same error as David pointed you
> for MMC2. Nevertheless, it's still working. Why? Because I have now a
> strong feeling that mux configuration is not working in the kernel (at
> least for the beagleboard). Here are a few facts that would confirm this
> statement:

I thought I #if 0 ... #endif the kernel mux code? I'll double check. I 
should try it with un patched u-boot and only the specific pins set in 
the kernel.

I'm juggling too many different things atm :(

I also changed the PIN MUX config option in the flag per another question.

Philip


> 
> - MUX setup for USB ehci has never worked in the kernel. It's why the
> beagleaboard rev-C ehci patch has been transfered to u-boot.
> 
> - the difference between your patch before and after it was working, is
> really the u-boot configuration. You haven't really changed anything in
> the kernel (especially in the spi driver) and as mentioned above, you
> have even introduced some competing muxes that should have created more
> trouble if the kernel mux config were working correctly.
> 
> - I had two other areas where I configured the pins in kernel and it was
> not working. Only when I eventually did it in u-boot, it started to
> work.
> 
> I don't know what's wrong with the pin configuration in the kernel,
> 
> Grégoire
>  
> 
> On Thu, 2009-02-19 at 09:14 -0500, Philip Balister wrote:
>> Gregoire Gentil wrote:
>>> Philip,
>>>
>>> Can you please post here or on the Beagleboard mailing list the u-boot
>>> patch? This muxpin is very tricky and I have experienced many problems
>>> when set up in the kernel while it seems to work better from u-boot -
>>> don't know why,
>> I posted it to the Beagle group. Let me know if you are having trouble 
>> finding it.
>>
>> If we come up with a better config for the expansion port, we'll clean 
>> it up and submit here. My gut feeling is having SPI interfaces on the 
>> expansion connector will be more useful then the MMC interface.
>>
>> Philip
>>
> 
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