IXP42x: Identify Intel IXP425 rev. A0 processors.

Signed-off-by: NKrzysztof Hałasa <khc@pm.waw.pl>

arch/arm/mach-ixp4xx/include/mach/cpu.h

@@ -26,6 +26,8 @@
 #define IXP46X_PROCESSOR_ID_VALUE	0x69054200 /* including IXP455 */
 #define IXP46X_PROCESSOR_ID_MASK	0xfffffff0
 
+#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \
+				IXP42X_PROCESSOR_ID_VALUE)
 #define cpu_is_ixp42x()	((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \
 			 IXP42X_PROCESSOR_ID_VALUE)
 #define cpu_is_ixp43x()	((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \
@@ -35,8 +37,11 @@
 
 static inline u32 ixp4xx_read_feature_bits(void)
 {
-	unsigned int val = ~*IXP4XX_EXP_CFG2;
+	u32 val = ~*IXP4XX_EXP_CFG2;
 
+	if (cpu_is_ixp42x_rev_a0())
+		return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
+					       IXP4XX_FEATURE_AES);
 	if (cpu_is_ixp42x())
 		return val & IXP42X_FEATURE_MASK;
 	if (cpu_is_ixp43x())