DUART_IMRISR_SPACING  217 arch/mips/include/asm/sibyte/bcm1480_regs.h #define DUART_IMRISR_SPACING	    0x20
DUART_IMRISR_SPACING  294 arch/mips/include/asm/sibyte/sb1250_regs.h #define DUART_IMRISR_SPACING	    0x20