[U-Boot] [PATCH v2] dfu, nand, ubi: add partubi alt settings for updating ubi partition

[Heiko Schocher]

Hello Tom,

Am 16.07.2013 17:14, schrieb Tom Rini:
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> On 07/16/2013 12:54 AM, Heiko Schocher wrote:
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> [snip]
>> - This patch is also a good starting point to fix up updating ubi,
>> as we currently use "nand erase" for erasing the sektors. This is
>> not the prefered way for writing an ubi image, see:
>> http://www.linux-mtd.infradead.org/faq/ubi.html#L_flash_img
>
> So, lets talk.  Have you, or can you, take a guess at how long it
> might take to add code to allow us to do this the right way?

Good question! My hope was, that this is a result of a discussion here ;-)

First, we should discuss how to handle an update of an ubi partition
on nand with dfu ...

I propose:

a) add a "partubi" for dfu_alt_info as this patch do, so we can use
    "dfu nand 0" as it is for raw nand partitions *and* nand ubi
     partitions
b) add a "ubi format ..." command
    (or can "ubi write" handle writing ubi images created with
     ubinize ? I think no ...)
    best: "ubi format ..." should handle incremental writes, so we
    can use the dfu_buf as it is ... else we must malloc an buffer
    which can hold the hole image -> the board must have enough ram
    for this ...
c) use "ubi format ..." for burning the ubi image into the nand ubi
    partition

a) done with this patch,
b) no real idea how many time it needs ...
c) should be trivial if we have step b)

What Do you think?

bye,
Heiko
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