--- zzzz-none-000/linux-3.10.107/arch/mips/sni/setup.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mips/sni/setup.c	2021-02-04 17:41:59.000000000 +0000
@@ -25,6 +25,7 @@
 #endif
 
 #include <asm/bootinfo.h>
+#include <asm/cpu.h>
 #include <asm/io.h>
 #include <asm/reboot.h>
 #include <asm/sni.h>
@@ -173,7 +174,7 @@
 		system_type = "RM300-Cxx";
 		break;
 	case SNI_BRD_PCI_DESKTOP:
-		switch (read_c0_prid() & 0xff00) {
+		switch (read_c0_prid() & PRID_IMP_MASK) {
 		case PRID_IMP_R4600:
 		case PRID_IMP_R4700:
 			system_type = "RM200-C20";