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Both the error output in function decompile_section() and the
definition of GPIO_BANK_MAX in script.h suffered from an "off
by one" logic. The bank numbering in the .bin is based on 1,
so it should be added to ('A' - 1) for human-readable output,
and the maximum number corresponding to 'N' is 14.

This became apparent when trying to translate a fex2bin-compiled
a80_optimus_board.bin back to its original .fex equivalent.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Move some lines so that the safeguards run (and exit, if needed)
before the normal output of header information.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

When declaring 'signed' values for section count and version
information in the script_bin_head structure, testing them to be
below certain thresholds (SCRIPT_BIN_*_LIMIT) is insufficient;
as 'negative' values like in "fexc-bin: script.bin: version:
-404840454.-1074397186.-1073906177" would still pass.

Fix this by making these member fields unsigned.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>

Signed-off-by: Luc Verhaegen <libv@skynet.be>

needed for A31 support. closes issue #9
Signed-off-by: Alejandro Mery <amery@geeks.cl>