EXI_CSR_CLKMASK    20 arch/powerpc/boot/ugecon.c #define   EXI_CSR_CLKMASK       (0x7<<4)
EXI_CSR_CLKMASK    23 arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c #define   EXI_CSR_CLKMASK       (0x7<<4)