diff --git a/target/linux/ar7/patches-3.3/310-ac49x-prom-support.patch b/target/linux/ar7/patches-3.3/310-ac49x-prom-support.patch
new file mode 100644
index 000000000..dddf22106
--- /dev/null
+++ b/target/linux/ar7/patches-3.3/310-ac49x-prom-support.patch
@@ -0,0 +1,20 @@
+--- a/arch/mips/ar7/prom.c
++++ b/arch/mips/ar7/prom.c
+@@ -70,6 +70,7 @@ struct psbl_rec {
+ };
+ 
+ static const char psp_env_version[] __initconst = "TIENV0.8";
++static const char psp_env_version_ac49x[] __initconst = "MaxENV0.2";
+ 
+ struct psp_env_chunk {
+ 	u8	num;
+@@ -186,7 +187,8 @@ static void __init ar7_init_env(struct e
+ 	struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
+ 	void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
+ 
+-	if (strcmp(psp_env, psp_env_version) == 0) {
++	if (strcmp(psp_env, psp_env_version) == 0 ||
++	    strcmp(psp_env, psp_env_version_ac49x) == 0) {
+ 		parse_psp_env(psp_env);
+ 	} else {
+ 		for (i = 0; i < MAX_ENTRY; i++, env++)