Another thought: we (I) changed bootldr after the 2.6.29 kernel work
so that it slows down access to the NAND, Samosa and other devices on
nCS4, in order to compensate for the doubled bus speed in the new
kernel. Were you running the latest bootldr, Jim?

No, couple weeks out of date. I should have realised that a new bootldr might have been a cure, I'm not a great fan of these dependencies.

Jim