diff --git a/lib/cpus/aarch64/cortex_a77.S b/lib/cpus/aarch64/cortex_a77.S
index 06b23d9..8c8f4d3 100644
--- a/lib/cpus/aarch64/cortex_a77.S
+++ b/lib/cpus/aarch64/cortex_a77.S
@@ -166,6 +166,34 @@
 	b	cpu_rev_var_ls
 endfunc check_errata_1946167
 
+	/* --------------------------------------------------
+	 * Errata Workaround for Cortex A77 Errata #1791578.
+	 * This applies to revisions r0p0, r1p0, and r1p1 and is still open.
+	 * x0: variant[4:7] and revision[0:3] of current cpu.
+	 * Shall clobber: x0-x17
+	 * --------------------------------------------------
+	 */
+func errata_a77_1791578_wa
+	/* Check workaround compatibility. */
+	mov	x17, x30
+	bl	check_errata_1791578
+	cbz	x0, 1f
+
+	/* Set bit 2 in ACTLR2_EL1 */
+	mrs     x1, CORTEX_A77_ACTLR2_EL1
+	orr	x1, x1, #CORTEX_A77_ACTLR2_EL1_BIT_2
+	msr     CORTEX_A77_ACTLR2_EL1, x1
+	isb
+1:
+	ret	x17
+endfunc errata_a77_1791578_wa
+
+func check_errata_1791578
+	/* Applies to r0p0, r1p0, and r1p1 right now */
+	mov	x1, #0x11
+	b	cpu_rev_var_ls
+endfunc check_errata_1791578
+
 	/* -------------------------------------------------
 	 * The CPU Ops reset function for Cortex-A77.
 	 * Shall clobber: x0-x19
@@ -191,6 +219,11 @@
 	bl	errata_a77_1946167_wa
 #endif
 
+#if ERRATA_A77_1791578
+	mov	x0, x18
+	bl	errata_a77_1791578_wa
+#endif
+
 	ret	x19
 endfunc cortex_a77_reset_func
 
@@ -227,6 +260,7 @@
 	report_errata ERRATA_A77_1508412, cortex_a77, 1508412
 	report_errata ERRATA_A77_1925769, cortex_a77, 1925769
 	report_errata ERRATA_A77_1946167, cortex_a77, 1946167
+	report_errata ERRATA_A77_1791578, cortex_a77, 1791578
 
 	ldp	x8, x30, [sp], #16
 	ret
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index fb33346..924c8d6 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -294,6 +294,10 @@
 # only to revision <= r1p1 of the Cortex A77 cpu.
 ERRATA_A77_1946167	?=0
 
+# Flag to apply erratum 1791578 workaround during reset. This erratum applies
+# to revisions r0p0, r1p0, and r1p1, it is still open.
+ERRATA_A77_1791578	?=0
+
 # Flag to apply erratum 1688305 workaround during reset. This erratum applies
 # to revisions r0p0 - r1p0 of the A78 cpu.
 ERRATA_A78_1688305	?=0
@@ -593,6 +597,10 @@
 $(eval $(call assert_boolean,ERRATA_A77_1946167))
 $(eval $(call add_define,ERRATA_A77_1946167))
 
+# Process ERRATA_A77_1791578 flag
+$(eval $(call assert_boolean,ERRATA_A77_1791578))
+$(eval $(call add_define,ERRATA_A77_1791578))
+
 # Process ERRATA_A78_1688305 flag
 $(eval $(call assert_boolean,ERRATA_A78_1688305))
 $(eval $(call add_define,ERRATA_A78_1688305))