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

05/20/2025

RD 05:29 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Jonathan,
Thank you for your support. It's clear now, and I see that they have provided the DDR ECC driver code in R5. I will look into it and try to inject and test DDR at runtime.
Thank you,
Rajkumar Rajkumar Dumala

05/19/2025

JC 03:29 PM Software Development: RE: Enable DDR ECC in Am62A processor

Rajkumar Dumala wrote in message#6956:
> Hi Jonathan,
> ... Jonathan Cormier

05/16/2025

RD 06:33 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Jonathan,
Thank you for the response.
I applied the three patches you provided to my current workspace, rebuilt U-Boot and the device tree, and it is working fine—the system is booting successfully.
However, I have a few doub... Rajkumar Dumala

05/14/2025

JC 08:34 PM Software Development: RE: Enable DDR ECC in Am62A processor

Attached 2 patches for u-boot and 1 patch for the kernel.
Most of these changes you and Mike have already talked about. I think attachment:0002-mitysom-62ax-hack-Reduce-4GB-size-for-ECC.patch is likely the part your missing.
Also ... Jonathan Cormier

JC 02:20 PM Software Development: RE: Enable DDR ECC in Am62A processor

Thanks Rajkumar, I agree. I'll look into it today. Jonathan Cormier

RD 04:22 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Jonathan,
Thank you for the clarification.
From what I understand, the DDR setup code dynamically detects the RAM size and initializes the DDR during the U-Boot phase. When ECC is enabled, a portion of memory (around 1/9th) is r... Rajkumar Dumala

05/13/2025

JC 09:25 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Rajkumar Dumala wrote in message#6940:
> Hi Mike,
> ...
Note per "PCN20250509000":https://support.criticallink.com/redmine/projects/mitysom_am62x/wiki/Errata_and_Module_Product_Change_Notifications the AM62A you have may be set to 1.25... Jonathan Cormier

MW 09:29 AM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Rajkumar,
It's not clear why there would be a difference between the two. It's the same processor / frequency design.
You might try and disable all of the peripherals you don't intend to use in the device tree you are using, as... Michael Williamson

RD 07:28 AM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Mike,
I was on leave for the past four days, so I wasn't able to communicate.
When we tested on the TI EVM, the behavior was slightly better, and we were able to achieve 800 Hz.
Thank you,
Rajkumar.
Rajkumar Dumala

JC 04:48 PM Software Development: RE: Enable DDR ECC in Am62A processor

Sorry guys. Ecc doesn't work with the current u-boot code.
The issue is my ddr setup code which dynamically sets up the ddr based on ddr size. The code needs to reduce the max size when ecc is enabled.
I have some hard coded test c... Jonathan Cormier

MW 02:21 PM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Raj,
Does it work on the TI EVM? The reason I ask is that the EVM has 8 GB of memory. I just want to make sure it's memory size and not something with the IPC / DSP comms and enabling ECC that is the problem.
-Mike
Michael Williamson

RD 02:01 PM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Mike,
I don't understand why it's not working, even though all the reserved regions seem to be within the valid memory range.
@@[ 0.000000] Reserved memory: created CMA memory pool at 0x00000000c0000000, size 256 MiB
[ 0.00... Rajkumar Dumala

MW 12:11 PM Software Development: RE: Enable DDR ECC in Am62A processor

Hi Rajkumar,
From this link:
https://support.criticallink.com/redmine/projects/mitysom_am62x/wiki/Enabling_DDRSS_ECC
The maximum memory address is approximately 0xFFFFFFFF * 8 / 9 ~= 0xE38E38E2
It looks like the maximum CMA s... Michael Williamson

RD 10:42 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hello,
It was my mistake—I shared the wrong screenshot earlier. You can find the correct one attached with this message.
Thank you,
Rajkumar Rajkumar Dumala

RD 10:38 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hello Mike,
I reduced the CMA size to 512 MiB; however, the issue remains the same.I am providing the image for your reference.
Thank you,
Rajkumar.
Rajkumar Dumala

MW 09:37 AM Software Development: RE: Enable DDR ECC in Am62A processor

Well. Sorry it only goes up to 0xF0000000. But that still may be too high. Michael Williamson

MW 09:36 AM Software Development: RE: Enable DDR ECC in Am62A processor

Hello,
When you enable ECC in LPDDR4, you reduce the maximum amount of addressable memory available to the device. IT uses some of the 4 GB to hold the ECC data.
The CMA settings I am seeing above include a 576 MB (assuming 0x2000... Michael Williamson

RD 07:49 AM Software Development: RE: Enable DDR ECC in Am62A processor

Just to add to the above point:
In the boot log, it shows that ECC is enabled, and I am able to run some test cases as mentioned in the TI documentation using U-Boot (manual boot mode).
Thank you. Rajkumar Dumala

RD 07:43 AM Software Development: Enable DDR ECC in Am62A processor

Hello there,
We are using the MitySOM-AM62x Devkit with the AM62A System on Module (SoM), which includes 4 GB of LPDDR4 (with inline ECC).
As part of SDL, we enabled ECC in the R5 MSRAM (512 KB) it is working fine . After that, I e... Rajkumar Dumala

05/07/2025

JC 02:55 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Note we are not super familiar with ROS but from my quick googling, sending messages around 1kHz does seem like its approaching the limits of ROS2 even on a desktop system. I'm not saying its not possible because I don't know but we shou... Jonathan Cormier

JC 02:21 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Rajkumar, Note I added pre tags around your code dumps. You have been using the @ symbols but that only works for single lines. You can easily add the pre tags by highlighting what you want marked as code and then hitting the pre butto... Jonathan Cormier

MW 10:06 AM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

When you run the example on the TI EVM (with SDK 10.1 + RT config), do you see 1000 Hz performance or the same 600 Hz performance? Michael Williamson

RD 05:46 AM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Mike,
We have pulled the Ubuntu-based Docker container on top of the MitySOM SDK 10.01.
We built the kernel using the following command:
make O="$BUILDDIR" defconfig ti_arm64_prune.config mitysom-am62xx-devkit.config ti_rt.config... Rajkumar Dumala

05/02/2025

RD 01:06 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Mike,
The U-Boot build is working fine. I haven't tried the SD card image you mentioned yet, but I will try it and update you.
Thank you. Rajkumar Dumala

05/01/2025

JC 07:43 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Updated 10.1 62A images have been released. https://support.criticallink.com/redmine/projects/mitysom_am62x/wiki/Repositories_and_Pre-built_Images#MitySOM-AM62Ax-Development-Kit-SD-Card-Image Jonathan Cormier

04/30/2025

JC 03:45 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

I also just pushed the commit to the mitysom-u-boot-2024.04 u-boot branch. So you could build u-boot and update the 10.1 SDK sdcard image. Similar to how you did the debian image.
https://support.criticallink.com/gitweb/?p=u-boot-ti.g... Jonathan Cormier

JC 02:13 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

> Card did not respond to voltage select! : -110
> ...
I was just looking into this error case last week. Do you happen to be using a sandisk sdcard?
In the 10.1 SDK u-boot, TI has enabled UHS mode in u-boot to allow booting fas... Jonathan Cormier

RD 01:07 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Mike,
Hope you're doing well.
We received the AM62A SoM today from Critical Link and inserted it into the AM62x Development Kit.
We flashed the SD card with the reference microSD card image (tisdk-default-image-mitysom-am62ax.roo... Rajkumar Dumala

04/29/2025

JC 01:43 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

> I ran the 62xx-build-dts.sh script, but it threw an error because it was unable to find the .config file
Thanks for pointing this out. I'd never tried using the dts script without already having run the full build. But this can be... Jonathan Cormier

MW 12:54 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Glad you got it fixed! (our comments passed each other!) Michael Williamson

MW 12:53 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Can you check if you disabled the MCAN0 mux options? Usually the first device to claim the resource wins, so if MCAN initializes first it might claim the pins on you.
make sure the lines below are commented out in k3-am62px-mitysom-d... Michael Williamson

RD 12:46 PM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

Hi Mike,
Update on the above comment:
It is working now. The issue was that pins B23 and F20 were already being used in the main_gpio_p3_pins_default node for the P3 connector. I commented out those two pins, and now UART5 has started ... Rajkumar Dumala

RD 11:54 AM Software Development: RE: Debian SDK Not booting in am62p (Am62x dev kit)

We’ve now implemented the changes you suggested, and the OS is working fine.
Since we only copied the U-Boot and device tree from the Critical Link (CL) build into the TI file system, we needed to explicitly enable main_uart5 in the d... Rajkumar Dumala