fixed:
when nand read. do ecc check not just bad block.
try to fix mmc driver. will keeping work on that.
change:
remove bootdelay when press [S] + power.
create a xburst in mips/ folder.
cleanup start.S cache.S cpu.c
follow the new sturcture of u-boot.
Signed-off-by: Xiangfu Liu <xiangfu@sharism.cc>
