On Fri, Oct 27, 2017 at 1:32 PM, Robert Nelson <robertcnel...@gmail.com> wrote:
> On Fri, Oct 27, 2017 at 1:27 PM, Robert Nelson <robertcnel...@gmail.com>
> wrote:
>> Hi John,
>>
>> On Fri, Oct 27, 2017 at 1:20 PM, John Morris <j...@zultron.com> wrote:
>>> To get Beagle GPIOs configured correctly at boot, is a custom overlay the
>>> right way to go? I want a bunch of the PocketBeagle pins configured as GPIO
>>> output low, but some of them start up in other modes with unwanted signals.
>>
>> So one of the difference between the BBB and the PocketBeagle, we have
>> 'config-pin' built-into the base *.dtb
>>
>> So if you want a dedicated use of a pin, you need to disable the
>> config-pin/cape-unversal pinmux:
>>
>> P1_02_pinmux {
>> status = "disabled";
>> };
>>
>> So this should work:
>>
>> https://gist.github.com/RobertCNelson/41ed096d96bede9617c0a1adafb24677
>
> OH and Charles wrote another option, i don't think we ever tested it..
>
> https://github.com/RobertCNelson/ti-linux-kernel-dev/blob/ti-linux-4.9.y/patches/drivers/ti/gpio/0008-bone-pinmux-helper-Add-support-for-mode-device-tree-.patch
>
> P1_02_pinmux {
> mode = "gpio_pd";
> };
it looks silly:
https://gist.github.com/RobertCNelson/41ed096d96bede9617c0a1adafb24677#file-gistfile2-txt
but it should work..
There will still be a little noise from power on -> u-boot -> kernel
(kernel loads in about 1 - 2 seconds)
Regards,
--
Robert Nelson
https://rcn-ee.com/
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
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