Re: Can i access the barebox env from linux

From: Michel Stam <michel@reverze.net>
To: Alexander Aring <alex.aring@gmail.com>,
	Ashutosh Singh <embedded.ashu@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: Can i access the barebox env from linux
Date: Wed, 26 Mar 2014 12:53:03 +0100	[thread overview]
Message-ID: <5332BF9F.8060308@reverze.net> (raw)
In-Reply-To: <20140326113300.GB9427@omega.Speedport_W_921V_1_24_000>

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In case anyone is interested; for a barebox x86 project I wrote a 
library that overrides fopen/fclose/open/close/etc a while back, which 
allows read access to the environment sector if properly configured. I 
managed to get it working on arm/mips with mtdblock as well.

In the near future I'd like to write a kernel driver to read the 
filesystem properly, this was more of an experiment.

Cheers,

Michel
On 03/26/2014 12:33 PM, Alexander Aring wrote:
> On Wed, Mar 26, 2014 at 12:31:03PM +0100, Alexander Aring wrote:
>> On Wed, Mar 26, 2014 at 04:44:30PM +0530, Ashutosh Singh wrote:
>>> Thanks Alex,
>>>
>>> The script is quite helpful.
>>> But since i am saving my barebox.env in nand and want to mount, modify
>>> and write it back to nand.
>>> Do you have a safer solution so that complete env data won't corrupted.
>> 1. You need to save the bareboxenv as image, the right place would be
>>     /tmp which is tmpfs and this uses ram for storing data. You need inotify
>>     support in kernel and I am sure tmpfs also supports inotify. You also need
>>     the inotify userspace utilities.
>>
>> 2. The image should write via nandwrite from mtd-utils [1]. Look for
>>     the nandwrite manpage. nandwrite should write the tmp-image from bbenv
>>     to your nand mtd device.
>>
> 3. To read the image from bbenv partition you should also not use
>     bareboxenv tool directly. Use nanddump for that and then use
>     bareboxenv to extract these files to /tmp/bbenv or whatever.
>
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