--- zzzz-none-000/linux-3.10.107/arch/mips/sibyte/bcm1480/setup.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mips/sibyte/bcm1480/setup.c	2021-02-04 17:41:59.000000000 +0000
@@ -22,6 +22,7 @@
 #include <linux/string.h>
 
 #include <asm/bootinfo.h>
+#include <asm/cpu.h>
 #include <asm/mipsregs.h>
 #include <asm/io.h>
 #include <asm/sibyte/sb1250.h>
@@ -119,7 +120,7 @@
 	uint64_t sys_rev;
 	int plldiv;
 
-	sb1_pass = read_c0_prid() & 0xff;
+	sb1_pass = read_c0_prid() & PRID_REV_MASK;
 	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 	soc_type = SYS_SOC_TYPE(sys_rev);
 	part_type = G_SYS_PART(sys_rev);