Ways to copy FIT image from the flash to RAM
Sean Anderson
seanga2 at gmail.com
Thu Sep 17 22:26:28 CEST 2020
On 9/11/20 1:47 PM, Andrii Voloshyn wrote:
> Hi there,
>
> What are the ways of copying whole FIT image form NOR flash to RAM by specifying flash offset without any extra bytes.
> I've seen quite a lot of times when kernel image size has a fixed value (as an uboot environment variable), which is greater than the actual kernel size.
> Problem with that that we copy from flash whatever is after kernel which is not required, and there is a potential problem when kernel gets bigger at some
> point than the fixed size specified in the variable mentioned above.
> As FIT file has all required info about size, is there a command to copy it to RAM from flash?
>
> Thank you
>
> Cheers,
> Andy
>
Yes... but only for NAND flash...
I am also interested in booting from NOR flash, so I was looking around
and noticed that the function nand_load_image used by the nboot command
contains no nand-specific functionality. Although it calls
nand_read_skip_bad, that in turn only call simple wrappers around
generic mtd functions. The only nan-specific part is the check against
unknown command suffixes, which is easily moved to do_nandboot.
In terms of things already supported by U-Boot, you could format your
flash device with UBIFS, and then use ubifsmount/ubifsload/bootm to
boot.
--Sean
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