Thanks Bo! My thinking with fw_printev (setenv) was that I would use it to set the environment variables from our user space app. This way, we can control when the USB stick will be used for a kernel or rootfs upgrade. Any thoughts on show this could be scripted and run? We would like to be able to have a customer in the field do this without having to do anything but send a command from the user app, insert the USB drive and reboot.
Lance -----Original Message----- From: Bo Shen [mailto:[email protected]] Sent: Thursday, May 16, 2013 7:22 PM To: Lance Beck Cc: [email protected] Subject: Re: [U-Boot] u-boot USB question 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 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
