KN02_SYS_CSR
csr = *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR);
*(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR) = csr;
csr = *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR) &
*(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR) = csr;
csr = *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR);
csr = *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR);
csr = *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(KN02_SYS_CSR);