[U-Boot] How to start U-Boot for i.MX31 NAND out of RedBoot (out of RAM)

[Ulrich Gerster]

Hello,

>>>> Wolfgang Denk <wd at denx.de> 14.07.09 13.22 Uhr >>>
> Dear "Ulrich Gerster",

> In message <4A5C71DA0200004D00014C8A at hochblauen.ba-loerrach.de> you wrote:
>> 
>> I can ping my linux host and I'm able to download a binary file via TFTP into RAM.
>> But I'm not able to ping the boad with u-boot from my linux host. In my config-file I 
>> defined CONFIG_NETMASK and CONFIG_IPADDR. What could be wrong?

>Nothing is wrong. That's expected and documented behaviour.

>> Another strange thing is the nand driver. I build my u-boot with:
>> #define CONFIG_MX31_NAND   1
>> #define CONFIG_CMD_NAND
>> #define CONFIG_SYS_NO_FLASH   1
>> #define CONFIG_ENV_IS_IN_NAND   1
>> #define CONFIG_SYS_NAND_BASE   CS0_BASE
>> #define CONFIG_SYS_MAX_NAND_DEVICE 	1
>> #define CONFIG_SYS_NAND_MAX_CHIPS	1
>> 
>> If I then try to get "flinfo" information u-boot jumps to the next command line and prints nothing.

>Seems you don't have NOR flash on your board, then (or no driver
>configured for it).

> If I try "nand info" I get information about nand device 0.

> OK.

> Another strange thing is that I can't read from nand flash but I can write.

> That's indeed strange. How do you know you can write then when you
> cannot read the data back for verification?

Your're right. I only use NAND Flash.
At the moment I'm starting u-boot out of RAM using RedBoot.
I'm assuming that U-Boot is writing something to the NAND Flash because if I enter a commad in U-Boot like "saveenv" or "nand write" my RedBoot is not working anymore after that. I have to reprogramm RedBoot in the Flash before I can boot it again.

Thanks for helping.
Best Regards 
Ulrich Gerster