diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index f178f1a..9ccd787 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -61,6 +61,10 @@
 # only to revision >= r3p0 of the Cortex A15 cpu.
 ERRATA_A15_827671	?=0
 
+# Flag to apply erratum 852421 workaround during reset. This erratum applies
+# only to revision <= r1p2 of the Cortex A17 cpu.
+ERRATA_A17_852421	?=0
+
 # Flag to apply erratum 819472 workaround during reset. This erratum applies
 # only to revision <= r0p1 of the Cortex A53 cpu.
 ERRATA_A53_819472	?=0
@@ -212,6 +216,10 @@
 $(eval $(call assert_boolean,ERRATA_A15_827671))
 $(eval $(call add_define,ERRATA_A15_827671))
 
+# Process ERRATA_A17_852421 flag
+$(eval $(call assert_boolean,ERRATA_A17_852421))
+$(eval $(call add_define,ERRATA_A17_852421))
+
 # Process ERRATA_A53_819472 flag
 $(eval $(call assert_boolean,ERRATA_A53_819472))
 $(eval $(call add_define,ERRATA_A53_819472))