Hi Lance,
On 5/17/2013 06:32, Lance Beck wrote:
We are using u-boot on an AT91SAM9G20 platform with NAND Flash and running
Linux. Is there a means to update the kernel and root fs image by reading them
from a USB memory device and writing the new images to flash? I have built the
fw_printenv tool thinking I might be able to use this to somehow trigger that
action.
Yes. Please take the following example (using the mainline
u-boot-2013.04) for updating related image from USB disk.
1. connect usb to board and power up
U-boot> usb start
(Re)start USB...
USB: scanning bus for devices... 2 USB Device(s) found
scanning bus for storage devices... 1 Storage Device(s) found
U-boot> fatls usb 0
...
2396352 uImage
...
U-boot> fatload usb 0 0x20000000 uImage
U-boot> nand erase 0x200000 0x600000
U-boot> nand write 0x20000000 0x200000 <uImage_size>
If all steps are successfully, then you have updated linux kernel uImage.
BTW, the fw_printenv is used with Linux file system to access u-boot
environment.
Not sure where to go from here...
Thanks,
Lance
Best Regards,
Bo Shen
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