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Failure in CM-T3x firmware update may prevent proper boot from on-board NAND flash. It is recommended to create a bootable MMC/SD card before updating CM-T3x firmware
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Introduction
This article describes firmware update process for CM-T3x system-on-module product line. The CM-T3x product line includes the following modules:
Preliminary setup
- Make sure to power off the CM-T3x evaluation platform
- Connect the host PC to the SB-T35 base-board (connector P12) 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-T3x evaluation system. The U-Boot boot-loader will start and you will get a command prompt.
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If the boot settings of your CM-T3x are different than default, you may need to press and hold ^C while turning the CM-T3x on, in order to get command prompt.
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CM-T3x firmware can be updated from an MMC/SD card or using network TFTP download.
Both methods are performed from the U-Boot command line.
CM-T3x Firmware consists of two components: X-Loader and U-Boot. The U-Boot bootloader can be installed and updated independently without updating the existing X-Loader. Please continue to CM-T3x U-Boot Update section for U-Boot installation instructions.
CM-T3x X-Loader Update
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X-Loader can be installed only to completely erased NAND flash! The procedure below erases the entire NAND flash!
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MMC/SD card
- Copy x-load.bin.ift from U-Boot package for CM-T3x to the root directory of the MMC/SD card.
- Insert the MMC/SD card into the SD socket (P13) on SB-T35.
- Start the U-Boot MMC subsystem and check that your storage device is ready and contains the X-Loader binary
# mmc init
# fatls mmc 0
- Load the X-Loader into memory
# fatload mmc 0 80a00000 x-load.bin.ift
TFTP download
- Setup TFTP server
- Put the X-Loader binary in the root directory of TFTP server
- Setup U-Boot networking:
# dhcp
- for dynamic IP configuration, or
# setenv ipaddr <ip address>
# setenv serverip <server ip>
- for static IP configuration
- Download the X-Loader to the CM-T3x RAM
# tftp 80a00000 x-load.bin.ift
Flashing X-Loader
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Do not reset or power off the CM-T3x during the update process! Doing so may result in nand flash corruption!
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- Flash the X-Loader onto the on-board NAND flash:
# nandecc hw
# nand erase
# nand scrub
# nand write 80a00000 0 20000;
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It is essential to install U-Boot immediately after X-Loader update
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CM-T3x U-Boot Update
MMC/SD card
- Copy u-boot.bin from U-Boot package for CM-T3x to the root directory of the MMC/SD card.
- Insert the MMC/SD card into the SD socket (P13) on SB-T35.
- Start the U-Boot MMC subsystem and check that your storage device is ready and contains the U-Boot binary
# mmc init
# fatls mmc 0
- Load the U-Boot into the CM-T3x RAM
# fatload mmc 0 80a00000 u-boot.bin
TFTP download
- Setup TFTP server
- Put the U-Boot binary in the root directory of TFTP server
- Setup U-Boot networking:
# dhcp
- for dynamic IP configuration, or
# setenv ipaddr <ip address>
# setenv serverip <server ip>
- for static IP configuration
- Download the U-Boot to the CM-T3x RAM
# tftp 80a00000 u-boot.bin
Flashing U-Boot
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Do not reset or power off the CM-T3x during the update process! Doing so may result in nand flash corruption!
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- Flash the U-Boot onto the on-board NAND flash:
# nandecc sw
# nand erase 80000 60000
# nand write 80a00000 80000 60000
- Reset the CM-T3x evaluation platform
U-Boot packages
See also
