[U-Boot] uboot newbie question on booting ep405 board

[David Li]

Hi Wolfgang,

Thanks for the suggestions. I think I will try to upgrade the u-boot
to the latest version. buildroot can also build u-boot image. I 'll
look into it.

David


On Sun, Apr 14, 2013 at 10:51 PM, Wolfgang Denk <wd at denx.de> wrote:
> Dear David Li,
>
> In message <CAADET=eJPeCkxwsoHP5+D7pijbbHGK1XumGTaaDka-TRRVRh8A at mail.gmail.com> you wrote:
>>
>> I am new to using uBoot and learning with a EP405 board.
>
> Which exact board is this?
>
>> Basically I built the Linux uImage and device tree blob for EP 405.
>> Both were downloaded on to RAM  - uImage at memory 0x200000 and
>> ep405.dtb at 0x4000000.
>
> Note that these addresses are way too low in any case.
>
>> When I used "bootm" to boot the
>> kernel, I always get "Bad Magic Number" like this:
>>
>>
>> => bootm 0x2000000 - 0x4000000
>> ## Booting image at 02000000 ...
>>    Image Name:   Linux-3.7.8
>>    Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>>    Data Size:    2571848 Bytes =  2.5 MB
>
> Even your compressed kernel is bigger than the 2 MB where you load it;
> when uncompressing, it will overwrite both the tail of the UImage
> itself, and the DTB.
>
>> ## Loading RAMDisk Image at 00000000 ...
>> Bad Magic Number
>
> Did you now wonder why it's talking about a ramdisk here?  You did not
> pass a ramdisk address (at least you did not mean to).
>
>> U-Boot 1.2.0-gd35b508a-dirty (Sep 19 2007 - 14:13:23)
>>
>> What's wrong? Why it's loading ramdisk at 0000000? I built the kernel
>> and initramfs together in the uImage.
>
> Your U-Boot is more than 6 years old; that is not only stone age, but
> even long before the introduction of device tree support.  You cannot
> use this ancient U-Boot version to boot a recent LInux kernel with
> device tree support.
>
> PLease update to a recent U-Boot version, or stick with Linux kernel
> versions of similar age, i. e. something like v2.6.19 or v.2.6.20
> (yes, this is old crap, but so is your version of U-Boot).
>
> 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
> We, the unwilling, led by the unknowing, are doing the impossible for
> the ungrateful. We have done so much, for so long, with so little, we
> are now qualified to do anything with nothing.