[U-Boot] U-Boot environment update in linux embedded ARM architecture

[U-Boot] U-Boot environment update in linux embedded ARM architecture

[Jan Misfatto]

Dear Madam/Sir,
our company, Microhard s.r.l, produces data acquisition terminals and in 
our new design, which is under development, we use an ARM 9 plattform 
based on the AT91SAM9263 microcontroller. Right now our system uses a 
NAND Flash chip from Micron MT29F2G08AACWP and out Memory is mapped as 
follows

0x0 AT91Booststrap
0x20000 *U-Boot (2009.06)*
0x60000 *U-Boot Env.*
0x A0000 Linux Kernel
0x400000 Rooot FS (jffs2)

We are trying to update the U-booot environment from U-boot with the 
/"savenev"/ command. We encounter the following problem. When updating 
the u-boot environment part of the u-boot code is overwritten with the 
environment parameters. This happens only when our NAND flash has bad 
blocks in the u-boot zone. (Block 1 and 2), We receive the information 
about the  bad blocks from Sam-ba.  If we use a NAND  with no bad blocks 
everything works fine.
Could you kindly give any advise about this topic?
We looking foreword for your answer thank you for your time,
best regards

Jan Misfatto
-- 

*/Jan Misfatto/*

*/Microhard/**/ S.r.l./*
*Tel: +39.0331.514420*
*Fax: +39.0331.514707*
*e-mail:* *<jan.misfatto@microhard.biz>*

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[U-Boot] U-Boot environment update in linux embedded ARM architecture

[Alessandro Rubini]

> 0x20000 *U-Boot (2009.06)*
> 0x60000 *U-Boot Env.*

So two blocks. for u-boot, which is bigger than one block.

> the u-boot environment part of the u-boot code is overwritten with the 
> environment parameters. This happens only when our NAND flash has bad 
> blocks in the u-boot zone. (Block 1 and 2),

In this case u-boot is stored in two blocks, but skipping the bad
block.  Your env area will contain the trailing part of u-boot binary.
I'm sure your consultant already told you.

> /Questo messaggio ed i suoi allegati viene spedito solo alle persone 
> indicate come destinatarie. Esso contiene informazioni confidenziali 

Please avoid this meaningless stuff when posting to public lists (even
in private mail it sounds insulting, but that's just personal taste).

/alessandro