[U-Boot] [PATCH v3 0/7] Add support for using an UBI volume for environment

[Tom Rini]

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On 04/12/2013 02:19 AM, Stefan Roese wrote:
> Hi Joe,
> 
> On 12.04.2013 00:26, Tom Rini wrote:
>> On Mon, Apr 08, 2013 at 03:32:45PM -0500, Joe Hershberger wrote:
>> 
>>> NAND is not good at handling absolute addresses to sectors for
>>> storing particular data.  The current implementation of the
>>> NAND env support works around this in several ways such as
>>> storing a pointer to the sector in the OOB of the first sector
>>> (interferes with some CRC) or supporting a range of sectors
>>> (which unless it is huge is not guaranteed to be safe).  None
>>> of these options address wear-leveling concerns or bad block
>>> handling.
>>> 
>>> Accessing the u-boot env from UBI eliminates these concerns.
>>> However, it does require some of the basic settings for finding
>>> the UBI env to be in the default u-boot env.
> 
> One question: Do you plan to support the fw_env Linux tools with
> this env-in-UBI feature as well?

That is what the 'gluebi' comment is about.  It could however stand to
be documented more explicitly in the README or similar.  You use
CONFIG_MTD_UBI_GLUEBI in the kernel to allow you to map UBI volumes
(which the env(s) are) as regular flash devices.

- -- 
Tom
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