[meta-freescale] [meta-fsl-arm-extra] Booting RIoTboard

[Gary Thomas]

On 2015-05-01 06:06, Nikolay Dimitrov wrote:
> Hi Gary,
>
> On 04/23/2015 03:18 AM, Nikolay Dimitrov wrote:
>> Hi Gary,
>>
>> On 04/23/2015 12:37 AM, Gary Thomas wrote:
>>> I've just built an image for the i.MX6DL/RIoTboard using the latest
>>> master (fido).  I had to add this line to local.conf:
>>> MACHINE_EXTRA_RRECOMMENDS_remove_imx6dl-riotboard =
>>> "fsl-alsa-plugins" as the fsl-alsa-plugins won't currently build with
>>> Linux-4.0
>>>
>>> Now I'm trying to boot the image.  I've copied it to my SD card and
>>> set the switches appropriately (I found two web pages about this and
>>> they have conflicting information!  The answer seems to be
>>> SW1-SW8=On/Off/On/Off/Off/On/Off/On)
>>
>> I have 2 riotboards both booting from sdcards, here are their
>> configurations:
>> - slot J6 (USDHC2), SW1-8 = On/Off/On/Off/Off/On/On/Off
>> - slot J7 (USDHC3), SW1-8 = On/Off/On/Off/Off/On/Off/On
>
> Just wanted to follow-up on this topic, probably due to curiosity. I
> did some experiments and I can agree with you that the switch positions
> definitely don't follow the docs (1 = On, 0 = Off, X = don't care):
>
> J6 boot ok: 10100 XXX
>
> J7 boot ok: 10100 010
>              10100 110

I think more correctly this would be:
   J6 boot: 10100 X0X
   J7 boot: 10100 X1X

>
> So I guess this somewhat explains the confusion.
>
> I've looked at the schematic some months ago to map which boot signals
> goes to which switch, so the only way to explain this unexpected (to
> me) behavior is either a mistake on my side when tracing the signals or
> something different about the imx6s bootrom. Or me reading the wrong RM
> :).

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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