[U-Boot] U-boot doubts

[U-Boot] U-boot doubts

[Chandra Sekar]

Hi,

  why do we have two files(env_nand.c and env_flash.c) to manipulate
environmental variables?

  According to my knowledge nand is also a flash type then why we have
separate file called env_flash.c or is this file will be used for nor flash?


chandru

[U-Boot] U-boot doubts

[Wolfgang Denk]

Dear Chandra Sekar,

In message <67b11d980912162018j3febe826l91c6b52134123d37@mail.gmail.com> you wrote:
>
>   why do we have two files(env_nand.c and env_flash.c) to manipulate
> environmental variables?

Because NAND flahrequires diofferent handling than NOR flash.

Note there is also common/env_dataflash.c, common/env_eeprom.c,
common/env_mgdisk.c, common/env_nowhere.c, common/env_nvram.c,
common/env_onenand.c, and common/env_sf.c

>   According to my knowledge nand is also a flash type then why we have
> separate file called env_flash.c or is this file will be used for nor flash?

NOR flash is a memory device which is byte-addressable by the
processor. NAND flash is no memory, but a storage device instead,
which needs to be read in buffers into RAM before you can access
arbitrary bytes of it's content.

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
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planning to reduce the time it takes.

[U-Boot] U-boot Doubts

[Chandra Sekar]

Hi ,

   I am new to u-boot, can any one explain what is  the functionality of
board_init_f(), cpu_init_f()
functions ?.

thank you,
chandru

[U-Boot] u-boot doubts

[Chandra Sekar]

Hi ,

    If i enable the CONFIG_ENV_IS_EMBEDDED macro, where the environmental
variables will be stored?
    Can i use saveenv command? if yes, where it will be stored?

thanks
-chandru

[U-Boot] u-boot doubts

[Dennis Semakin]

> Hi ,
>  
>      If i enable the CONFIG_ENV_IS_EMBEDDED macro, where the environmental
>  variables will be stored?
>      Can i use saveenv command? if yes, where it will be stored?
>  
>  thanks
>  -chandru
>  
>  

May be here, in common/env_embedded.c written

/*
 * Generate embedded environment table
 * inside U-Boot image, if needed.
 */
#if defined(ENV_IS_EMBEDDED)
/*
 * Only put the environment in it's own section when we are building
 * U-Boot proper.  The host based program "tools/envcrc" does not need
 * a seperate section.  Note that ENV_CRC is only defined when building
 * U-Boot itself.