KN01_SYS_CSR
kn01csr = *(volatile uint16_t *)MIPS_PHYS_TO_KSEG1(KN01_SYS_CSR);
csr = *(volatile uint16_t *)MIPS_PHYS_TO_KSEG1(KN01_SYS_CSR);
*(volatile uint16_t *)MIPS_PHYS_TO_KSEG1(KN01_SYS_CSR) = csr;