AM62 GP SOC Migration
This page is using the default release am62-yocto-dunfell-5.10.168_08.06.00.42-v1.2.
To view this page for a specific Variscite SoM and software release, please follow these steps:
- Visit variwiki.com
- Select your SoM
- Select the software release
Introduction
Variscite's VAR-SOM-AM62 System on Module (SOM) is based on the Texas Instruments AM62 System on Chip (SoC). This SoC has two variants: a non-secure variant (GP) and a secure variant (HS). Moving forward, Variscite is shipping only secure variants of the SoC, and as shown in the table below, the default Yocto image will now support the secure variant.
Customers who received one of the early evaluation kits from Variscite with the GP SOC can follow the steps of this guide to boot Yocto am62-yocto-dunfell-5.10.168_08.06.00.42-v1.2 and newer on the GP SOC.
| Yocto Version | SoC Compatibility |
|---|---|
| am62-yocto-dunfell-5.10.168_08.06.00.42-v1.0 and newer | Non-Secure (GP) |
| am62-yocto-dunfell-5.10.168_08.06.00.42-v1.1 and newer | Non-Secure (GP) |
| am62-yocto-dunfell-5.10.168_08.06.00.42-v1.2 and newer | Secure (HS) and Non-Secure (GP) with manual migration |
For more information, see the following from TI: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/08_06_00_42/exports/docs/linux/Foundational_Components_Migration_Guide.html
Prerequisites
The migration steps below assume you have followed Yocto Build Release to build and program a recovery SD card.
Migrating SD Card to GP SoC
After building a recovery SD card, replace the 'tiboot3.bin' with the GP variant 'tiboot3-am62x-gp-evm.bin' on the boot partition. The process is outlined as follows:
Mount the SD Card on your system:
$ sudo mkdir sdcard; mount /dev/<deviceid>1 sdcard
Overwrite 'tiboot3.bin' with the GP variant:
$ sudo cp sdcard/tiboot3-am62x-gp-evm.bin sdcard/tiboot3.bin
Safely unmount the SD Card:
$ sudo umount sdcard
Migrating eMMC to GP SoC
The process of migrating the eMMC to support the GP SoC variant is very similar to that of the SD Card. Here are the steps to do it:
Boot the recovery SD card and install Yocto to eMMC
root@am62x-var-som:~# install_yocto.sh
Mount the SD card on your system
root@am62x-var-som:~# mkdir sdcard; mount /dev/mmcblk1p1 sdcard
Mount the eMMC on your system:
root@am62x-var-som:~# mkdir emmc; mount /dev/mmcblk0p1 emmc
Overwrite 'tiboot3.bin' with the GP variant:
root@am62x-var-som:~# cp sdcard/tiboot3-am62x-gp-evm.bin emmc/tiboot3.bin
Safely unmount the eMMC and SD card:
root@am62x-var-som:~# umount emmc sdcard