consider that a completely unreadable NAND block is bad,
and thus should be skipped silently.
+ CONFIG_SPL_ABORT_ON_RAW_IMAGE
+ When defined, SPL will proceed to another boot method
+ if the image it has loaded does not have a signature.
+
CONFIG_SPL_RELOC_STACK
Adress of the start of the stack SPL will use after
relocation. If unspecified, this is equal to