From 46d55f353e84f8c71a63c04459952d5ea1a92fae Mon Sep 17 00:00:00 2001
From: Eyck Jentzsch <eyck@minres.com>
Date: Sun, 11 Aug 2024 17:29:13 +0200
Subject: [PATCH] adds signature to start of firmware

---
 env/start.S | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/env/start.S b/env/start.S
index 33b691b..0df91a6 100644
--- a/env/start.S
+++ b/env/start.S
@@ -7,12 +7,17 @@
 _start:
 .option push
 .option norelax
-    la gp, trap_entry
-    csrw mtvec, gp
+.option norvc
+	j 1f
+	.2byte	0x4e4d
+	.2byte	0x5352
+	.4byte  0x669
+1:
     la gp, __global_pointer$
 .option pop
 	la sp, _sp
-
+    la t0, trap_entry
+    csrw mtvec, t0
 	/* Load data section */
 	la a0, _data_lma
 	la a1, _data