[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Jeff Angielski]

Has anybody converted the environment code from u-boot into a Linux
application that can change the u-boot parameters through the MTD
layer?  

I am just trying to save some time by not duplicating previous efforts.

Jeff Angielski
The PTR Group

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Diekema, Jon]

> Has anybody converted the environment code from u-boot into a
> Linux application that can change the u-boot parameters
> through the MTD layer? 

We are using two busybox applets: setenv and printenv

I have attached two files that do all the real work.
These files could be converted into stand alone application.

------------------\\----------------------\\----------------------------
Jon Diekema        |                       | Smiths Aerospace
(616) 241-8310     |                       | 3290 Patterson Avenue, SE
 jon.diekema at smiths-aerospace.com          \\  Grand Rapids, MI 49512


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[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Wolfgang Denk]

In message <1076079848.4612.6.camel@localhost.localdomain> you wrote:
> 
> Has anybody converted the environment code from u-boot into a Linux
> application that can change the u-boot parameters through the MTD
> layer?  

Yes. And you hold the tools right in your hand.

See tools/env/README

> I am just trying to save some time by not duplicating previous efforts.

RTFM helps :-)

Best regards,

Wolfgang Denk

-- 
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Always borrow money from a pessimist; they don't expect  to  be  paid
back.

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Wolfgang Denk]

In message <BC1D6832B887974A8A4BE71B8E34E051D24573@cossmgmbx03.email.corp.tld> you wrote:
> 
> > Linux application that can change the u-boot parameters
> > through the MTD layer? 
> 
> We are using two busybox applets: setenv and printenv

That's the old stuff from our SELF package.


> I have attached two files that do all the real work.
> These files could be converted into stand alone application.

The new stuff in tools/env is IMHO better, as more flexible (run-time
configurable, includes support  for  redundand  environment  sectors,
etc.)

Best regards,

Wolfgang Denk

-- 
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Dealing with failure is easy: work hard to improve. Success  is  also
easy  to  handle:  you've  solved  the  wrong  problem.  Work hard to
improve.

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Cam]

Wolfgang

>>Has anybody converted the environment code from u-boot into a Linux
>>application that can change the u-boot parameters through the MTD
>>layer?  
> 
> 
> Yes. And you hold the tools right in your hand.
> 
> See tools/env/README

It seems to offer read access only - is anyone working on changing the 
variables / adding new ones from linux?

-Cam

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Wolfgang Denk]

In message <4023EE6F.6060604@mesias.co.uk> you wrote:
> 
> >>Has anybody converted the environment code from u-boot into a Linux
> >>application that can change the u-boot parameters through the MTD
> >>layer?  
> > 
> > 
> > Yes. And you hold the tools right in your hand.
> > 
> > See tools/env/README
> 
> It seems to offer read access only - is anyone working on changing the 
> variables / adding new ones from linux?

What makes you think it does not include write access?

Did you actually look at the code? it reads:

...
 * Command line user interface to firmware (=U-Boot) environment.
 *
 * Implements:
 *      fw_printenv [ name ... ]
 *              - prints the values of the environment variables
 *                "name", or the whole environment if no names are
 *                specified
 *      fw_setenv name [ value ... ]
 *              - If a name without any values is given, the variable
 *                with this name is deleted from the environment;
 *                otherwise, all "value" arguments are concatenated,
 *                separated by sinlge blank characters, and the
 *                resulting string is assigned to the environment
 *                variable "name"
...

Guess what "fw_setenv" is doing?



Best regards,

Wolfgang Denk

-- 
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
It is impractical for  the  standard  to  attempt  to  constrain  the
behavior  of code that does not obey the constraints of the standard.
                                                          - Doug Gwyn

[U-Boot-Users] Editing u-boot parameters from Linux using MTD

[Cam]

Wolfgang

>>It seems to offer read access only - is anyone working on changing the 
>>variables / adding new ones from linux?

> Guess what "fw_setenv" is doing?

I skim read that before compiling it and finding only 'fw_printenv', My bad.

-Cam