endian

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

	Big and Little Endian Byte Orderings 
	Big and Little Endian Byte Orderings 

The MIPS processor and compilers support both the Big Endian and Little
Endian byte-ordering conventions. The names Big Endian and Little
Endian are used because of the apt analogy to the bloody feud in the
classic children's book Gulliver's Travels (quod vide). The feud was
between the two mythical islands, Lilliput and Blefescu, over the
correct end (big or little) at which to crack an egg. 
In our case, the
issue has to do with the "end" (most significant or least significant)
of a multiple-byte data type.  

With Big Endian ordering, the address of a multiple-byte data type is
of its most significant byte (its "big end"), whereas with Little
Endian ordering, the address is of its least significant byte (its
"little end"). This is shown in Figure A.14. For structures declared
in a high-level language, the order of bytes in memory will differ
depending on the byte ordering and the particular data type, as shown
for a C structure in Figure A.15.