[U-Boot] [PATCH] omap5: Allow use of a plain text env file

[Tom Rini]

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On 03/22/2013 08:23 PM, Wolfgang Denk wrote:
> Dear Nishanth Menon,
> 
> In message <1363992223-1628-1-git-send-email-nm at ti.com> you wrote:
>> For production systems it is better to use script images since 
>> they are protected by checksums and carry valuable information 
>> like name and timestamp. Also, you can't validate the content 
>> passed to env import.
>> 
>> But for development, it is easier to use the env import command
>> and plain text files instead of script-images.
> 
> Be careful here.  There are some subtle, but important
> differences.
> 
> With a script image, you are basically running standard commands, 
> which includes certain tests and limitations.  With "env import",
> you are just importing a set of environment settings, without
> further tests for permissions, etc.
> 
> For example, think if data like your MAC address or board serial 
> number are important to you, or if you are willing to have any
> user overwrite these with arbitrary data.

Right.  What I really want to see happen, and hope to find some time
to play with, is moving this almost identical in 3+ boards BOOTCOMMAND
into something that can be included and is commented enough to make
such risks clear.  For all of these development platforms that ship
with example filesystems with no-password remote ssh root login, it's
just another secure-me spot, but indeed, there is a risk of leakage
into production systems if such things aren't clear.  This came from
the beagle boards where it's really useful for a developer-focused
board (edit a plain text file, and have things just update and work? yay).

- -- 
Tom
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