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

[Nikolay Dimitrov]

Hi Gary,

On 05/01/2015 03:31 PM, Gary Thomas wrote:
> 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

Well, it's not a matter of correctness, but facts. My riotboard can
boot from J6 regardless of the 3 rightmost switches. Also, SW8 needs to
be Off in order to boot from J7.

You can try it on your board.

>> 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
>> :).

Regards,
Nikolay