1.3. Flashing Instruction

1.3.1. DFU Recovery

It’s possible to put the AM62Px SK EVM in USB DFU mode, which allows loading bootloaders over DFU. This is done via the snagboot tool. This is useful for initial flashing or recovering boards which have broken bootloaders.

1.3.1.1. Installation and setup

Install snagboot 1.3.0 following the official instructions Make sure to install the udev rules as documented:

$ snagrecover --udev > 50-snagboot.rules
$ sudo cp 50-snagboot.rules /etc/udev/rules.d/
$ sudo udevadm control --reload-rules
$ sudo udevadm trigger

Tip

If Snagboot cannot be installed, it’s possible to boot the initial bootloaders from an SD card. Follow Android Bootloader on SD Card if you encounter issues with Snagboot.

1.3.1.2. eMMC flashing

1.3.1.2.1. Flashing instructions

Once the build is complete, follow the steps below to flash the images to eMMC.

Change the boot mode DIP switches to DFU mode:

Switch Label

SW2: 12345678

SW3: 12345678

USB DFU

00000000

11001010
Ensure the device is plugged in with USB host and debug UART/serial debug
Open a terminal debugger to view console output from the device:
```
$ sudo picocom -b 115200 -r -l /dev/ttyUSB0
```
The following sequence assumes that 2 terminals are open:
- On the left, a terminal to send commands from the PC to the device
- On the right, the picocom console to run commands on the device

PC	Device
run `snagrecover`: # If you are using binaries built locally $ cd out/target/product/am62p (OR) # If you are using pre-built binaries from SDK download page $ cd AM62Px_10.01.00_emmc $ snagrecover -s am625 -f ./am62px-sk-evm-hsfs.yaml produces: Starting recovery of am625 board Installing firmware tiboot3 Searching for partition id... Downloading file... Could not read status after end of manifest phase Done Done installing firmware tiboot3 Installing firmware tispl Searching for partition id... Downloading file... Done Done installing firmware tispl Installing firmware u-boot Searching for partition id... Downloading file... Done Sending detach command... Done installing firmware u-boot Installing firmware u-boot Searching for partition id... Downloading file... Done Sending detach command... Done installing firmware u-boot Done recovering am625 board	Halt the autoboot countdown by pressing any key: U-Boot SPL 2023.04-g83660642 (Jul 15 2024 - 11:30:29 +0000) SYSFW ABI: 4.0 (firmware rev 0x000a '10.0.6--v10.00.06 (Fiery Fox)') SPL initial stack usage: 17048 bytes Trying to boot from DFU ##########################################################DOWNLOAD ... OK Ctrl+C to exit ... ##############################################################DOWNLOAD ... OK Ctrl+C to exit ... Authentication passed Authentication passed Authentication passed init_env from device 10 not supported! Authentication passed Authentication passed Starting ATF on ARM64 core... NOTICE: BL31: v2.10.0(release):09.02.00.009 NOTICE: BL31: Built : 11:30:24, Jul 15 2024 U-Boot SPL 2023.04-g83660642 (Jul 15 2024 - 11:30:56 +0000) SYSFW ABI: 4.0 (firmware rev 0x000a '10.0.6--v10.00.06 (Fiery Fox)') SPL initial stack usage: 1904 bytes Trying to boot from DFU #####DOWNLOAD ... OK Ctrl+C to exit ... Authentication passed Authentication passed U-Boot 2023.04-g83660642 (Jul 15 2024 - 11:30:56 +0000) SoC: AM62PX SR1.0 HS-FS Model: Texas Instruments AM62P5 SK DRAM: 2 GiB (effective 8 GiB) Core: 80 devices, 30 uclasses, devicetree: separate MMC: mmc@fa10000: 0, mmc@fa00000: 1 Loading Environment from MMC... OK In: serial Out: serial Err: serial Net: eth0: ethernet@8000000port@1, eth1: ethernet@8000000port@2 Hit any key to stop autoboot: 0 =>
	Ensure the default U-Boot environment is configured with: => env default -f -a; saveenv; ## Resetting to default environment Saving Environment to MMC... Writing to MMC(0)... OK Note If you build with `TARGET_AVB_ENABLE=true` or flash user images you need to run this: => setenv force_avb "1"; saveenv; Saving Environment to MMC... Writing to MMC(0)... OK Tip By default, no Device-Tree Overlays are selected. Follow this link to configure Device Tree Overlay Support
	Enable fastboot mode on the device by executing below command. Before running this, make sure USB-C cable is connected from the host PC to the EVM: => fastboot 0
Run the the `flashall.sh` script to start flashing the binaries to eMMC: # If you are using binaries built locally $ cd out/target/product/am62p (OR) # If you are using pre-built binaries from SDK download page $ cd AM62Px_10.01.00_emmc $ sudo ./flashall.sh --board am62px-sk board: am62px-sk Fastboot: ./fastboot Generating bootloader-am62px-sk.img ... mkfs.fat 4.2 (2021-01-31) Generating bootloader-am62px-sk.img: DONE Create GPT partition table OKAY [ 0.032s]	Writing GPT: success! dwc3-generic-peripheral usb@31000000: request 00000000f7ec4040 was not queued to ep1in-bulk Bad device specification mmc tiboot3_a Bad device specification mmc tiboot3_a Couldn't find partition mmc tiboot3_a dwc3-generic-peripheral usb@31000000: request 00000000f7ec4040 was not queued to ep1in-bulk

Tip

If you get mcopy command not found error on Linux PC, install the mtools package:

$ apt-get install mtools

Warning

It’s possible that the in-memory partition layout is still from an older system.

In that case, we can observe flashing errors similar to:

writing 'tiboot3'...
FAILED (remote: invalid partition or device)

When that happens:

Reboot into the newly flashed bootloader with $ fastboot reboot bootloader
Restart the flashing from U-Boot environment.

Once the flashing is complete, power off the board
Change boot mode DIP switches to boot from eMMC user partitions and power cycle the board:

Switch Label

SW2: 12345678

SW3: 12345678

EMMC (with UDA)

00000000

11000010
Board should boot the Android images now.