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

[Wolfgang Denk]

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

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