Re: [U-Boot] How to start U-Boot for i.MX31 NAND out of RedBoot (out of RAM)
Hello
Magnus Lilja lilja.magnus@gmail.com 08.07.09 17.42 Uhr >>>
Hi
You should define CONFIG_SKIP_LOWLEVEL_INIT since redboot has already setup the SDRAM. If you load U-boot to the address it's set up to execute from you should also define CONFIG_SKIP_RELOCATE_UBOOT.
It's been a long while since I used redboot to start u-boot (on the i.MX31 PDK) so I don't remember the correct redboot command but make sure the MMU is off when jumping to U-Boot.
Regards, Magnus
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?
Thanks a lot for your help. Best Regards Ulrich Gerster
Hi
Could you please do reply-all and keep all addresses when replying to a mail? I don't read all mail from the list so it's easy to miss a followup.
2009/7/9 Ulrich Gerster gersteru@dhbw-loerrach.de:
Hello
Magnus Lilja lilja.magnus@gmail.com 08.07.09 17.42 Uhr >>>
Hi
You should define CONFIG_SKIP_LOWLEVEL_INIT since redboot has already setup the SDRAM. If you load U-boot to the address it's set up to execute from you should also define CONFIG_SKIP_RELOCATE_UBOOT.
It's been a long while since I used redboot to start u-boot (on the i.MX31 PDK) so I don't remember the correct redboot command but make sure the MMU is off when jumping to U-Boot.
Regards, Magnus
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.
/Magnus
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Magnus Lilja -
Ulrich Gerster