[U-Boot] Custom MPC8548 boot using FDT problem

[Jerry Van Baren]

Pieter wrote:
> Hi all
> 
> I have been working on booting our custom MPC8548 board using a FDT. 
> The board boots up to the point where "controll is passed to Linux" and
> then nothing happens. I have plased the final part of the console output
> at the bottom of this message.
> 
> Does anyone have an idea about what is going wrong?
> Is the error in my u-boot, device tree blob or linux kernel side?

Probably.  :-/

> I am also not able to erase my flash in U-Boot (nor)  does anyone know
> what i should look at?

What version of u-boot?
Are you using the CFI flash driver?
Do you have flash locked and forget to unlock it?
Did it work before?
Can you write the flash commands by hand (type in u-boot command line 
memory write commands - it isn't hard, works great) and have it work?

> thanks pieter
> 
>     WARNING: adjusting available memory to 10000000
>     ## Booting kernel from Legacy Image at 00200000 ...

Try a higher address, say 00400000?

>        Image Name:   Linux-2.6.27
>        Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>        Data Size:    1194002 Bytes =  1.1 MB
>        Load Address: 00000000
>        Entry Point:  00000000
>        Verifying Checksum ... OK
>        kernel data at 0x00200040, len = 0x00123812 (1194002)
>     ## Flattened Device Tree blob at 00800000
>        Booting using the fdt blob at 0x800000
>        of_flat_tree at 0x00800000 size 0x000037bc
>        Uncompressing Kernel Image ... OK
>        kernel loaded at 0x00000000, end = 0x00294a90
>     ## device tree at 0x00800000 ... 0x008037BB (len=26556=0x67BC)
>     ## Transferring control to Linux (at address 00000000) ...
>        Booting using OF flat tree...

Where did you get your FDT source from?
Did you modify it?
Does your FDT blob get properly fixed up by your u-boot?

It is difficult (and not very profitable) to try to make a new linux 
kernel run with an old u-boot version because both linux and u-boot fdt 
handling matured considerably over the last year.  The (kernel) FDT blob 
sources have matured a huge amount over the last year.

Good luck,
gvb