CM-T335: U-Boot: Firmware Update
Contents
Introduction
The CM-T335 Firmware consists of two components: Secondary Program Loader (SPL) and U-Boot. This article describes the firmware update process for CM-T335 system-on-module product.
Preliminary setup
- Make sure to power off the CM-T335 evaluation platform.
- Connect the host PC to the SB-T335 base-board (connector P11) via the serial cable supplied with the evaluation kit.
- Start terminal emulation software on your PC. Set baud rate to 115200 bps, 8 bit per frame, 1 stop bit, no parity, no flow control.
- Turn on the CM-T335 evaluation system. The U-Boot boot-loader will start and you will get a command prompt in the terminal window.
|
If the boot settings of your CM-T335 are different than default, you may need to press and hold ^C while turning the CM-T335 on, in order to get command prompt. |
Updating Firmware on the micro SD card
The firmware can be updated using a workstation with a micro SD card reader, or using CM-T335 module Linux environment.
- To update the SPL, just replace it's binary file (MLO) on the micro SD card with the desired version.
- To update the U-Boot, just replace the U-Boot binary file (u-boot.img) on the micro SD card with the desired version.
- Plug the micro SD card into the micro SD card socket of the SB-T335.
- Reset/power on the CM-T335 evaluation system to boot the updated firmware.
Updating Firmware on the NAND flash
CM-T335 firmware can be updated from a micro SD card or using network TFTP download. Both methods are performed from the U-Boot command line and include following common steps:
- Loading binary images from the selected media to the CM-T335 DRAM
- Flashing images to the on-board NAND flash
Updating from micro SD card
- Copy the firmware binary images MLO and u-boot.img from U-Boot package for CM-T335 to the root directory of the micro SD card.
- Insert the micro SD card into the micro SD socket (P23) on SB-T335.
- Start the U-Boot MMC subsystem:
# mmc rescan
- Check that the storage device is ready:
# fatls mmc 0
- Load the SPL binary into memory:
# fatload mmc 0 80a00000 mlo
- Load the U-Boot binary into memory:
# fatload mmc 0 80100000 u-boot.img
- Proceed to Flashing images section
Updating from USB
- Copy the firmware binary images MLO and u-boot.img from U-Boot package for CM-T335 to the root directory of the first partition on the USB storage device.
|
|
Make sure the type of the first partition on the USB storage device is FAT (e.g. W95 FAT32). |
- Plug the USB storage device into:
- USB host connector (either P25, P26, P27 or P28) on SB-T335 if the CM-T335 module has U4 configuration or
- USB OTG connector (P19) on SB-T335 if the CM-T335 module has U1 configuration
- Start the U-Boot USB subsystem:
# usb start
- Check that the storage device is ready:
# fatls usb 0
- Load the SPL binary into memory:
# fatload usb 0 80a00000 mlo
- Load the U-Boot binary into memory:
# fatload usb 0 80100000 u-boot.img
- Proceed to Flashing images section
Updating from TFTP server
- Setup a TFTP server
- Put the firmware binary images MLO and u-boot.img in the root directory of the TFTP server
- Setup U-Boot networking:
- for dynamic IP configuration:
# dhcp
- or for static IP configuration:
# setenv ipaddr <ip address> # setenv serverip <server ip>
- Download the SPL binary into memory:
# tftp 80a00000 MLO
- Download the U-Boot binary into memory:
# tftp 80100000 u-boot.img
- Proceed to Flashing images section
Flashing images
- Erase the on-board NAND flash for SPL image:
# nand erase 0 80000
- Write the SPL image into the on-board NAND flash:
# nand write 80a00000 0 20000;
- Erase the on-board NAND flash for U-Boot image:
# nand erase 200000 80000
- Write the U-Boot image into the on-board NAND flash:
# nand write 80100000 200000 60000;
- Remove the micro SD card from the micro SD socket.
- Reset the CM-T335 evaluation platform.
