[U-Boot] environement paramters with u-boot in nand

[Wolfgang Denk]

Dear "Cote, Sylvain",

I re-added the mailing list, as others might be interested, too.

Also, please don't top post / full quore. Please read
http://www.netmeister.org/news/learn2quote.html


In message <579B119545DAEF4689C8FBEEFEC5793F01D4FDF6E83B at ATLMBX.verint.corp.verintsystems.com> you wrote:
> The NAND layout you mean is:
>
> SPL (in first nand block) 
> u-boot config (N blocks depending on spare place allocated) 
> nand u-boot

This is one of the options - but you can chose those as you like.

> Can we do or is it a good idea to do:
>
> SPL
> Nand u-boot
> u-boot config

You can of course do that as well.

> Maybe in the second layout there are chances to overwrite config in
> case that at some moment new bad block occurs (after few u-boot
> update).

In each and evary configuration you should leave some room for spare
blocks in case you need them.

Even better, don't use such  a  fixed  block  mapping,  but  use  UBI
instead.  [Hoewver, booting from a UBI volume might be a challenge if
your NAND controller reads only a small initial block like 4 KiB...]

Please keep in mind that you must not use NAND like you used to use
hard disk drives. Please see for example
http://download.micron.com/pdf/technotes/nand/tn2917.pdf - this
explains nicely why you want UBI.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
SW engineering is a race between programmers trying  to  make  better
idiot-proof programs and the universe producing greater idiots.