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

[Magnus Lilja]

Hi

2009/7/14 Ulrich Gerster <gersteru at dhbw-loerrach.de>:
> Hello.
>
>>>> Magnus Lilja <lilja.magnus at gmail.com> 09.07.09 19.08 Uhr >>>
>
>>> I made the defines you mentioned above and build the image with make mx31guf_config (it's quite similar to the PDK
>>> board). Then I loaded the resulting u-boot.bin to 0x81000000 and tried to "run 0x81000000". The "run" command is with
>>> caches and MMU tured off.
>>> I get absolutely no output on the console and I have to reset the board.
>>> What could be the problem? How can I debug this?
>
>> Did you define CONFIG_SKIP_RELOCATE_UBOOT? If so, that may be the
>> problem (although I'm not 100% sure) if TEXT_BASE is not 0x81000000
>> (in your board config.mk). For most i.MX31 boards TEXT_BASE is
>> 0x87f00000.
>
> That was the point.
> Now I'm able to boot u-boot out of the RAM. It's working well but I have some issues.
>
> 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 here. As far as I know, the networking in U-boot is
not running in background, i.e it's only on/enabled when u-boot itself
issues a ping-command, tftp or something similar.

>
> 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.
> If I try "nand info" I get information about nand device 0.
> Another strange thing is that I can't read from nand flash but I can write.
>
> Do you have any suggestions?

The only i.MX31 NAND driver I've used in U-boot is the one I submitted
to the list last year but it was rejected. Other people have sent
updated drivers (I think there was a i.MX27 driver posted not long
ago), but I haven't tried these.
Even so, the CONFIG_SYS_NAND_BASE looks incorrect but I don't know if
that's the only problem.

Regards, Magnus Lilja