In message 41EE4C83.9020604@web.de you wrote:
To do so I just copied some u-boot.lds from some other port. I know that the u-boot.lds is a linker script that instructs the linker to put code elements together in some specific way. At least the first part does so. But the lower parts of the u-boot.lds I copied seem to be increasingly deep magic. So... what does the u-boot.lds do exactly and
I can't put it any better: It is a linker script that instructs the linker to put code elements together in some specific way.
what happens if mine is wrong/broken? And why do I need it anyway?
Your code will not run and/or crash.
You need it to get a working image.
Does that look reasonable/good?
This is impossible to say from this information. u-boot.map might be interesting to check - for you; please don't post it here, though.
Best regards,
Wolfgang Denk