Hello, how does uboot handle this flag byte ? (i I use redundant nand)
What initial value must this flag have? Same value for enviroment1 and enviroment2 ? If I make a "saveenv" which env. is used, and what values are then written to the NAND flash to set it as aktiv/deactive ? For example: In Linux I want to write my own Enviroment to the redundant Env: What must be the value of the flag byte to set this redundant enviroment actik, so that UBoot will use this one ? And: Which value do I have to write tho the other "old" enviroment in NAND flash, so that this one becomes deactive ? Thank you very much Manuel Sahm Wolfgang Denk schrieb: > Dear Manuel, > > in message <[EMAIL PROTECTED]> you wrote: > >> My problem the structure of the enviroment: >> If I understand: >> 4 byte crc; 1 byte flags, 0x20000-5 byte data. >> > > Correct - the flag byte is only present if you use redundant > environment. > > >> The CRC is over the data bytes,( not the flags byte included) , right ?? >> > > Correct. That's because the flasg byte indicates the state of the > environment copy (current -> bit = 1, or obsolete -> bit = 0). It > relies on the feature of NOR flash that you can always program '1' > bits to '0', even single bits in a single byte. > > >> What about the flag byte, which values should I have to write here ? >> > > See above. But you might have problems doing such a thing on NAND > storage. > > Best regards, > > Wolfgang Denk > > -- Freundliche Grüße / Best regards Manuel Sahm Research & Development FEIG ELECTRONIC GmbH Lange Straße 4 35781 Weilburg Germany Tel.: +49 (0)6471-3109.492 Fax.: +49 (0)6471-3109.99 email: [EMAIL PROTECTED] internet: http://www.feig.de ------------------------------------------------------------------------ Amtsgericht Limburg HRB 3178 Geschäftsführer: Dipl.-Ing. Wolfgang Feig ------------------------------------------------------------------------ ------------------------------------------------------------------------ Diese Email (eingeschlossen die Anhaenge) unterliegt Urheberrecht, die Informationen sind vertraulich und rechtswirksam privilegiert. Der Gebrauch dieser Email oder der Anhaenge von einem anderen als den Adressaten ist nicht gestattet und unrechtmaessig. This email (including any attachments) is subject to copyright, the information in it is confidential, and it is legally privileged. Use of this email or of any information in it other than by the addressee is unauthorised and unlawful. ------------------------------------------------------------------------ ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
