[U-Boot] Running mx6qsabrelite at 1Gz with Freescale kernel rel_imx_3.0.35_4.1.0

[Eric Nelson <eric.nelson@boundarydevices.com>]

Thanks Marek,

On 03/21/2014 06:33 PM, Marek Vasut wrote:
> On Friday, March 21, 2014 at 11:50:18 PM, Eric Nelson wrote:
>
> [...]
>
>>> 1) The kernel (old, I know) I am using does not like that PCIe to have
>>> been formerly probed by u-boot. It hangs at probing if so.
>>
>> We haven't had any trouble with our boundary-imx_3.0.35_4.1.0 branch
>> (which is based on rel_imx_3.0.35_4.1.0):
>>
>> 	https://github.com/boundarydevices/linux-imx6/tree/boundary-
> imx_3.0.35_4.1
>> .0
>>
>> You might give that a pin and see if it works for you. Troy did
>> make some modifications to PCIe in that tree.
>
> Let me remind you about that PCIe reset pin [1] again ... so, did you wire your
> PCIe slot's nRESET line or not on this design? Do you operate the nRESET
> correctly ?
>

:) It's a little late in the game for that, with lots of boards in the
wild.

>>> Thus I have to patch my kernel, or add an environment variable to not
>>> initialize PCIe when set, in order to keep compatible with old kernels.
>>>
>>   > For now, in order to boot, I have temporary disabled PCIe support
>>   > in U-boot.
>>
>> Thanks for the ping.
>>
>> Marek, I didn't catch that you had enabled PCIE by default.
>
> Maybe Stefano applied the patch which enabled the PCIe on SL ?

No worries.

 > If you want it disabled, just submit a patch, either way WFM.
>
>> Since there aren't any peripherals which depend on this, and
>> even the PCIe daughter board is an extra-cost item, I'd
>> prefer to leave this disabled and require the user to enable
>> it specifically.
>>
>> AFAIK, you're the only one who's tested this.
>
> Didn't you guys also test that ? But yes, I'm OK either way, feel
 > free to send a patch.
>

Right. We did test. What I should have said was that we're not "using"
this feature...

Patch on the way.

> [...]
>
> [1] http://lists.denx.de/pipermail/u-boot/2014-February/172496.html
>
> Best regards,
> Marek Vasut
 >