Texas Instruments TMS320DM357 DVEVM v2.05 manual Updating/Restoring the Bootloaders

Updating/Restoring the Bootloaders

A.5 Updating/Restoring the Bootloaders

The DM357 EVM board contains 2 GB of NAND flash memory. During the boot process 64 MB of NAND is used. After booting, 2 GB are used for the file system.

When the EVM board is reset, the ROM bootloader (RBL) executes, initializing the board and then loading a small program called UBL (User Bootloader) from NAND flash memory into internal memory for execution. UBL in turn loads the U-Boot bootloader program from NAND flash memory. The U-Boot bootloader is responsible for loading and starting the Linux kernel.

Therefore, there are two bootloader images that need to be stored in the EVM's NAND flash memory: UBL and U-Boot. This section describes how to flash UBL and U-Boot in case these images are corrupted or need to be updated.

If the U-Boot image is intact in the EVM flash memory, you can use it to update itself. If working U-Boot (or UBL) images are not present in flash, you will need to restore these images using Code Composer Studio (CCStudio) and an emulator. The subsections that follow explain both of these procedures.

You can find UBL, U-Boot, and the NAND programmer pre-built binaries in your DVSDK installation. The location for these is typically the

/home/<useracct>/dvsdk_#_#/PSP_#_#_#_#/bin/dm357 directory. Alternatively, the source code for the Bootloader components can be found in the /home/<useracct>/dvsdk_#_#/PSP_#_#_#_#/board_utilities directory.

For further information about upgrading and flashing, see the TI DaVinci

Technology Developers Wiki at http://wiki.davincidsp.com.

A.5.1 Updating U-Boot Using U-Boot

If the U-Boot image is intact in the EVM flash memory, you can use it to update itself by following these steps:

1)After aborting the automatic boot sequence, assign an IP address to the EVM board using one of these methods:

■If you are on a standalone network or using a network cross cable to your workstation, you can assign a static IP address to the EVM as follows:

EVM # setenv ipaddr <static IP address>

Additional Procedures A-9