diff --git a/feature.c b/feature.c
index 7a97948..11c98f2 100644
--- a/feature.c
+++ b/feature.c
@@ -176,6 +176,16 @@ void setup_features(void)
 			csr_write(CSR_MHCR, 0x17f);
 			csr_write(CSR_MXSTATUS, 0x638000);
 			csr_write(CSR_MHINT, 0x650c);
+		} else if (cpu_ver >= 0x4000 && cpu_ver <= 0x4fff) { //4.0.0~4.x.x
+			csr_write(CSR_MSMPR, 0x1);
+			csr_write(CSR_MCCR2, 0xe24a000a);
+			csr_write(CSR_MXSTATUS, 0xc0c38000);
+			csr_write(CSR_MHINT, 0x31ea32c);
+			csr_write(CSR_MHINT2, 0x180);
+			csr_write(CSR_MHCR, 0x11ff);
+#if __riscv_xlen == 64
+			csr_write(CSR_MENVCFG, 0x4000000000000000);
+#endif
 		} else {
 			while(1);
 		}