CHIP_REV_SHIFT
#define CHIP_REV_MASK (0xF << CHIP_REV_SHIFT)
#define CHIP_REV_Ax (0x0 << CHIP_REV_SHIFT)
#define CHIP_REV_Bx (0x1 << CHIP_REV_SHIFT)
(CHIP_REV_SHIFT + 1)) \
<< CHIP_REV_SHIFT)