target-riscv.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/target-riscv.c b/target-riscv.c
index 6d9113c1..201ac375 100644
--- a/target-riscv.c
+++ b/target-riscv.c
@@ -3,6 +3,7 @@
 #include "target.h"
 #include "machine.h"
 #include <string.h>
+#include <stdio.h>
 
 #define RISCV_32BIT	(1 << 0)
 #define RISCV_64BIT	(1 << 1)
@@ -47,6 +48,12 @@ static void parse_march_riscv(const char *arg)
 		{ "n",		0 },
 		{ "h",		0 },
 		{ "s",		0 },
+		{ "i",		0 },
+		{ "e",		0 },
+		{ "_",		0 },
+		{ "Counters",	0 },
+		{ "Zicsr",	0 },
+		{ "Zifencei",	0 },
 	};
 	int i;
 
@@ -60,7 +67,10 @@ static void parse_march_riscv(const char *arg)
 			goto ext;
 		}
 	}
-	die("invalid argument to '-march': '%s'\n", arg);
+
+unknown:
+	fprintf(stderr, "WARNING: invalid argument to '-march': '%s'\n", arg);
+	return;
 
 ext:
 	for (i = 0; i < ARRAY_SIZE(extensions); i++) {
@@ -73,7 +83,7 @@ ext:
 		}
 	}
 	if (arg[0])
-		die("invalid argument to '-march': '%s'\n", arg);
+		goto unknown;
 }
 
 static void init_riscv(const struct target *self)