Before burning, we need to confirm that uboot has been burned by ISP, and uboot contains “usbstar” command. Perform the following steps, including the “usbstar” command:
# cd boot # make menuconfig
First, we’ve used release_ to_ customer.sh The script compiles the images directory successfully. Next, through make_usb_upgrade_sigmastar.sh To create USB upgrade image:
# cd project # ./make_usb_upgrade_sigmastar.sh
After executing the above command, the USB upgrade image is generated successfully: project/ image/output/images/SigmastarUpgrade.bin , copyth e image to the U disk, and then connect the U disk to the board.
Then power on the board and enter uboot. Set upgradeport to 1
# setenv UpgradePort 1 # gpio output 73 1（The 4.3-inch development board needs to pull up the GPIO to power USB） # saveenv
Finally, execute usbstar to complete the upgrade