[U-Boot] Using u-boot to update the kernel and root-file system on NAND chip on imx28evk from USB memory stick

[Otavio Salvador]

On Fri, Aug 10, 2012 at 8:26 PM, Scott Wood <scottwood at freescale.com> wrote:
> On 08/08/2012 04:33 PM, Bill wrote:
>> All,
>>
>>     I'm needing the ability to upgrade the kernel and root-filesystem on
>> the 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.

Maybe https://github.com/otavio/u-boot/commit/7ccde26310719a9caef4cbe23bdf080d49d41791
might help?

-- 
Otavio Salvador                             O.S. Systems
E-mail: otavio at ossystems.com.br  http://www.ossystems.com.br
Mobile: +55 53 9981-7854              http://projetos.ossystems.com.br