Instructions to use the Armadeus U-Boot recovery utility.
If you think you bricked your board by flashing a bad bootloader, don't worry: there is a solution to recover it, without a JTAG probe. Indeed i.MX processors have an internal "bootstrap" mode that allow them to communicate through RS-232 or USB just after a reset.
- The uboot_recover tool is a Python piece of code that allows you to automatically install a new U-Boot from scratch or to recover it in case of failure. uboot_recover requires the python and pyserial packages to be installed on your PC:
$ sudo apt-get install python-serial python-usb
This utility communicates with the i.MX(L/27/28/51/6) processor while in bootstrap mode (See i.MX(L/27/28/51/6) Reference Manual for more informations).
- To enter the bootstrap mode, you have to put the bootstrap jumper and reset your Armadeus board:
- Quit all Kermit/Minicom/GTKTerm/Hyperterminal sessions connected to the board through Serial Port.
- Go inside the software/uboot_recover/ directory and launch (sudo usage is only required on APF28, APF51 and APF6):
$ cd software/uboot_recover/ $ sudo python apfXX_recover.py (XX depends on the version of your board (ie: 9328, 27, 28, 51 or 6))
- The tool will ask you to specify the serial port on which the board is connected. Under Linux please use /dev/ttySx or /dev/ttyUSBx and under Window$ use COMx.
- Then the size of the SDRAM has to be indicated. Default value is 16Mo for the APF9328 and 64Mo for the APF27. Not required on APF51 & APF6.
- The tool will then try to synchronize with the i.MX (on APF9328 only). When you see that message, reset your board:
Re-synchronizing... Please reset your board in bootstrap mode ! Please reset your board in bootstrap mode ! Please reset your board in bootstrap mode ! Please reset your board in bootstrap mode !
loading file ramprogrammer.bin. Please wait...
--- APF6 Bootstrap Tool --- Procedure to follow: 1] Be sure to: * have built the APF6 BSP (make apf6_defconfig; make), * have "sb" tool installed (On Ubuntu: sudo apt-get install lrzsz), * have launched this script as root (sudo). 2] Power off your board, close all serial terminal sessions, remove all USB cables 3] Take jumper off BOOT0 pin and put it on BOOT1 pin. 4] Power on your board 5] Connect a USB cable from your PC to the APF6Dev OTG miniUSB connector 6] Connect a USB cable from your PC to the APF6Dev console miniUSB connector --- Enter serial port number or device name to use for console (/dev/ttyUSB0 under Linux (default) or COMx under Window$):
- Then you can specify whether the environment variables (IP, your special scripts...) have to be erased or not. If your board does not start anymore after a first uboot_recover, please respond 'y'.
- The following messages are then displayed:
loading file ramprogrammer.bin. Please wait... 284 octets Loading file u-boot.bin. Please wait... 150304 octets loading file flashprogrammer.bin. Please wait... 668 octets Flashing please wait... . uBoot successfully recovered !
run flash_uboot device 0 offset 0x0, size 0xa0000 nand_unlock: start: 00000000, length: 655360! NAND flash successfully unlocked NAND erase: device 0 offset 0x0, size 0xa0000 OK NAND write: device 0 offset 0x0, size 0xa0000 655360 bytes written: OK NAND flash successfully locked device 0 offset 0xa0000, size 0x7f60000 nand_unlock: start: 000a0000, length: 133562368! NAND flash successfully unlocked Flashing of uboot succeed BIOS>uBoot successfully recovered !