AM625SIP: Quickest way to monitor GPIO after boot for analog power sequencing

Hello Blake,

Are they using SBL boot, or SPL boot? You can find some initial discussion on SBL vs SPL here:
https://dev.ti.com/tirex/explore/node?node=A__ATV8lNuOMfaMT1..qF.S4g__AM62-ACADEMY__uiYMDcq__LATEST

SPL boot

In the standard Linux SDK SPL boot, there are a couple of options: toggling GPIOs directly from uboot, or initializing the M4F core using the uboot rproc driver to control the pins. General steps to use uboot rproc are here: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/Foundational_Components/U-Boot/UG-RemoteProc.html

Note that we are planning to add support for uboot rproc initializing PRU cores, but that feature will not be implemented yet in our upcoming Linux SDK 9.2. I do not have a committed timeframe for when that support will be officially added.

SBL boot 

Customers that need remote cores up and running as fast as possible (e.g., automotive usecases, medical where a remote core needs to be up ASAP, etc), typically use SBL boot because SBL can initialize remote cores even earlier than uboot can.

Regards,

Nick