Mity CPU Platforms » MitySOM-AM62, MitySOM-AM62A, & MitySOM-AM62P

12/10/2024

JC 03:03 PM Software Development: RE: USB Device mode communication problems

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1449610/am625-backport-disable-usb-lpm-to-6-6-kernel-- Jonathan Cormier

JC 02:44 PM Software Development: RE: USB Device mode communication problems

iseori kang wrote in message#6830:
> Hello,
> ...
Good find. Interestingly in the 6.6 kernel both the AM62A and AM62P have those lpm-disable options for both USB0 and USB1.
https://lore.kernel.org/all/20240412-for-v6-10-am62-usb-t... Jonathan Cormier

IK 09:46 AM Software Development: RE: USB Device mode communication problems

Hello,
The team seems to have solved it with the following settings.
Fixed Dts file
snps,usb2-lpm-disable;
snps,usb2-gadget-lpm-disable;
best regards, iseori kang

IK 03:06 AM Software Development: RE: USB Device mode communication problems

Forwarding additional content
Messages when USB is working
[ 259.298196] drivers/usb/dwc3/gadget.c:3693 dwc3_gadget_interrupt() event->type = 0/Disconnect
[ 267.416974] drivers/usb/dwc3/gadget.c:3693 dwc3_gadget_interrupt() even... iseori kang

IK 12:21 AM Software Development: RE: USB Device mode communication problems

Hello,
We noticed that the message is different for success and failure.
It is only coming from a few laptops.
(Lenovo family more often)
I've attached a schematic, nothing special.
USB1 is being used for internal communicatio... iseori kang

12/09/2024

JC 03:27 PM Software Development: RE: USB Device mode communication problems

> Have you sent Jonathan a copy of your schematic, I can review that as well.
The schematic I received was only the ethernet section so its missing the USB. Jonathan Cormier

MW 02:15 PM Software Development: RE: USB Device mode communication problems

I have not been able to reproduce it here, yet.
Do you get any messages from "dmesg" when the communication is dropped?
If you unplug and replug the cable, does the connection re-establish?
Have you sent Jonathan a copy of your ... Michael Williamson

IK 07:10 AM Software Development: RE: USB Device mode communication problems

Hello, Mike.
Do you have any updates on this?
Thank you and best regards, iseori kang

12/03/2024

JC 04:13 PM Software Development: RE: flash script needs to boot enable the device

Hi Nathan, Thanks for letting us know. I've pushed the fix to the kirstone and scarthgap branches. Jonathan Cormier

12/02/2024

JC 07:18 PM Software Development: RE: u-boot environment initialization

> The probable source of my confusion is that I thought those we were same place.
> ...
Correct. eMMC spec adds two unique boot sections and an rpmb? section. Which are distinct from the regular flash storage area seen on sdcards. Jonathan Cormier

JC 04:56 PM Software Development: RE: u-boot environment initialization

Pushed fix to u-boot 2023 and 2024
https://support.criticallink.com/gitweb/?p=u-boot-ti.git;a=commit;h=bb86b0aa5782cc2dcf2fe95c6009c93ae9394263
Test printing the environment after having saved it from u-boot Jonathan Cormier

JC 04:10 PM Software Development: RE: u-boot environment initialization

It looks to me like this is misconfigured in both 2023 and 2024 u-boot.
Here is a trimmed-down version of the u-boot config. Jonathan Cormier

NW 03:32 PM Software Development: RE: u-boot environment initialization

In my checks I tested both blocks. Reading back mmcblk0boot0 did show the environment. Reading back mmcblk0 did not have the environment. This is why I was speculating that Linux wasn't really writing to the actual device.
The prob... Nathan Wright

JC 03:14 PM Software Development: RE: u-boot environment initialization

Note according to our emmc boot instructions. https://support.criticallink.com/redmine/projects/mitysom_am62x/wiki/Boot_EMMC#EMMC-Layout
We do expect the environment to be in the boot0 block. My first guess is this was tested with th... Jonathan Cormier

JC 03:08 PM Software Development: RE: u-boot environment initialization

> Or did you mean you dumped out /dev/mmblk0boot0 in your check?
Can you confirm this part of Mike's question?
It sounds like you were writing to mmcblk0boot0 but u-boot is using mmblk0 instead for the environment location. If that'... Jonathan Cormier

NW 01:38 PM Software Development: RE: u-boot environment initialization

How would I determine that?
In uboot, there is the mmc command and the existing script sets mmcdev to 0 and bootpart to 0 (once it failed to boot at mmcdev 1, bootpart 1:2).
I was under the impression that the mmcblk0boot0 was a ... Nathan Wright

11/30/2024

MW 12:16 PM Software Development: RE: u-boot environment initialization

Hi Nathan,
Based on this from your comment:
_So I took an image of first 9000 512 blocks of /dev/mmcblk0 ..._
I am wondering if uBoot is booting from /dev/mmcblk0 and not /dev/mmblk0boot0 (which would explain your results). Or ... Michael Williamson

11/28/2024

IK 02:46 AM Software Development: RE: USB Device mode communication problems

Hello, Mike.
USB0 device settings.
!clipboard-202411281135-xfih4.png!
H/W
USB0 Connector : Mini-B
The circuit has a common-mode filter and a TVS. There are no special connections.
Vbus is designed to be a reference ... iseori kang

11/26/2024

NW 09:44 PM Software Development: u-boot environment initialization

We are trying to initialize the u-boot environment from linux kernel space.
We are following the flash script steps that basically unlock the special boot device and dd the file in to the correct location... Nathan Wright