Good morning,
thank you for contribute.
Could you please enrich your advice with details, due to the lack of
knowledge on this area I do not understand what and how I could follow your
directions.
Il giorno martedì 3 marzo 2020 19:25:32 UTC+1, evilwulfie ha scritto:
>
>
>
>
> If you need a pin set one way or another on boot buffer it
> use a tristate gate pull it high or low then after your overlay is loaded
> enable the buffer so you have control
>
>
>
>
>
> On 3/3/2020 10:34 AM, Faby wrote:
>
> Today I tried with an overlay and it works, but with about 12 seconds of
> delay.
> That is not the expected result, but finally somethings moves.
> Any suggestion or advise would be great.
>
> Il giorno giovedì 27 febbraio 2020 16:14:17 UTC+1, Fabrizio Borrello ha
> scritto:
>>
>> Hi,
>> I would like to set low the logic level on the P9_11 during the power on,
>> so before the linux kernel has bees loaded.
>> I do not have experince with tree device and boot loader so I am here to
>> ask your help.
>>
>>> For what I was able to discover and collecting fragmentated
>>>> informations, I have to modify the file
>>>> "/boot/dtbs/4.14.71-bone-rt-r17/am335x-boneblack-uboot.dtb".
>>>>
>>> This file should be responsable for give the earlier informations during
>> the power on start up of the system.
>> I have decompiled this file and added:
>>
>> pinmux_P9_11_gpio_pd_pin {
>> pinctrl-single,pins = <0x70 0x27>;
>> phandle = <0x180>;
>> };
>> P9_11_pinmux {
>> compatible = "bone-pinmux-helper";
>> status = "okay";
>> pinctrl-names = "default", "gpio", "gpio_pu", "gpio_pd", "gpio_input",
>> "uart";
>> pinctrl-0 = <0x17d>;
>> pinctrl-1 = <0x17e>;
>> pinctrl-2 = <0x17f>;
>> pinctrl-3 = <0x180>;
>> pinctrl-4 = <0x181>;
>> pinctrl-5 = <0x182>;
>> };
>> P9_11 {
>> gpio-name = "P9_11";
>> gpio = <0x35 0x1e 0x0>;
>> output;
>> dir-changeable;
>> };
>>
>> So, I guess, the system in power up will be able to set up and drive this
>> PIN.
>>
>> Due to the lack of specific knowledge in this area now I am stuck, I
>> don't know how to precede.
>>
>> Please help.
>>
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