[U-Boot] u-boot error undefined instruction

[Pierluigi Greto]

Hello everyone,

Apologize if it's not the right channel to ask this kind of questions. I 
have build an image using YOCTO for an arm7 platform. I'm creating a 
fitImage with the kernel and the dtb file, but after installing the 
image and starting the device I get this error:

```
Starting kernel ...

undefined instruction
pc : [<61008004>]          lr : [<dff4d8c4>]
sp : dfefbda8  ip : 0000001e     fp : 00000000
r10: dffa16e8  r9 : 00000000     r8 : dfefdf68
r7 : dff4db6c  r6 : dfefe4f8     r5 : 61008000  r4 : dffa2e00
r3 : 0000293a  r2 : 64ffa000     r1 : 0000127f  r0 : 00000000
Flags: nzCv  IRQs off  FIQs off  Mode SVC_32
Resetting CPU ...
```

Can someone give me some hint on what is the error's cause? How do I fix 
the error? Can be a matter of load addresses?
In the attachment the entire startup log.

Thank you very much,
Pierluigi

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