Embedded module TQMa62xx - YOCTO Linux BSP documentation

STKa62xx USB Boot

The TI Sitara AM62x CPU provides the option to boot from USB (host and device).

Prerequisites

Boot from USB host (mass storage)

1. Format a USB flash drive with FAT32 filesystem.
2. Copy the files listed below from the Yocto buildspace deploy directory to the USB flash drive prepared with FAT32:

  • u-boot.img
  • tispl.bin
  • tiboot3.bin
The USB flash drive partition must be set as active!

3. Connect the USB flash drive with the USB 3.0 the USB-OTG interface.
4. Set the STKa62xx DIP switches to boot from USB host (mass storage).

S4

S5

S6

S7

5. Connect host PC with STKa62xx connector X10 and setup the terminal program.
Please see the terminal_emulator section how to setup a serial debug connection.
6. Power on the STKa62xx to boot from USB.

Boot from USB device (dfu-util)

Please check that dfu-util is installed the Linux host.

1. Copy the files below from the Yocto buildspace deploy directory deploy e.g. the home folder:

  • u-boot.img
  • tispl.bin
  • tiboot3.bin

2. Connect STKa62xx X7 and X10 with a mirco USB cable to the Host PC.

  • X10 is used to connect the STKa62xx as USB device
  • X7 is used as serial debug connection

3. Set the STKa62xx DIP switches to boot from USB device (dfu-util).

S4

S5

S6

S7

4. Power up the STKa62xx.
5. Open a second terminal for the serial debug connection with e.g. Minicom
Please see the terminal_emulator section how to setup a serial debug connection.
6. Open terminal (shell) on Linux host and execute the commands below to boot the STKa62xx via USB device.

After initial power-on, U-Boot will reset the CPU as a part of an TI Errata workaround, so tiboot3.bin needs to be loaded twice.
After a warm boot (reset from U-Boot or reboot from Linux), the initial load of tiboot3.bin must be skipped. 
sudo dfu-util -a bootloader -D tiboot3.bin
STKa62xx issues a reset after loading the tiboot3.bin via dfu-util. when it has been initially powered on.
If the STKa62xx has been reset from U-Boot or Linux it is not required to load tiboot.bin3 twice, so only the three commands below have to be executed. 
sudo dfu-util -R -a bootloader -D tiboot3.bin
sudo dfu-util -R -a tispl.bin -D tispl.bin
sudo dfu-util -R -a u-boot.img -D u-boot.img