Dear Graeme Russ,
I had a quick look at this and nothing is jumping out at me. Of course I am not familiar with ARM asm...
I don't see any reason why this ultimately will not work eventually. You may be having some issues with the transition from asm->C->asm through the relocation - This was an especially painful thing for me involving an intermediate trampoline which I have only recently figured out how to remove.
I think the relocation itself works fine, when looking at the debug output.
Maybe some memory barriers are needed to stop the C optimiser mangling things?
It can't really optimize across the call to the (now wrongly named) reloc_code in assembly.
Interestingly, ARM is adding gd->reloc_off while x86 is subtracting gd->reloc_off. If this is correct, I need to change the calculation of gd_reloc_off to be consistent
It should always ADD it, when it is calculated as "Final Location" - "Current Location". Note, of course, that the value itself might well be negative.
If, for example, the NOR Flash is at a higher address than RAM...
Best Regards Reinhard