On 08/08/2012 04:33 PM, Bill wrote:
All,
I'm needing the ability to upgrade the kernel and root-filesystem onthe NAND chip on the imx28evk from new files that reside on a USB memory stick. That is I want to partition the NAND (mtd) into 3 sections that contain u-boot, kernel, rootfs. Then whenever the system is booted, u-boot will probe the USB memory stick (using fatls and looking for a kernel file and rootfs file) If the files exist on the USB memory stick, uboot will automatically (first it will verify a CRC/Checksum) erase the kernel and rootfs sections on the NAND chip, and then copy the new kernel and rootfs from the USB stick to their respective sections in the flash chip (I think using fatload)?. It will never write a new u-boot.
I've also seen where u-boot can define the NAND flash partitions using the mtdparts command and pass these along to the kernel via command line args?
Can u-boot write/erase to a nand partition (i.e. /dev/mtd0) instead of using absolute memory addresses?
If you use U-Boot's mtdparts support, you can reference partitions by name (mtdparts name, not Linux device node name) in NAND commands.
-Scott