minor edit in start-up code

very first instruction is now "lui zero, 0" (just another dummy)
stnolting · Jul 22, 2021 · 74ea46a · 74ea46a
1 parent 8b8da12
commit 74ea46a
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Showing 3 changed files with 6 additions and 5 deletions.
diff --git a/rtl/core/neorv32_application_image.vhd b/rtl/core/neorv32_application_image.vhd
@@ -11,7 +11,7 @@ use neorv32.neorv32_package.all;
 package neorv32_application_image is
 
   constant application_init_image : mem32_t := (
-    00000000 => x"00000013",
+    00000000 => x"00000037",
     00000001 => x"80002117",
     00000002 => x"ff810113",
     00000003 => x"80000197",

diff --git a/rtl/core/neorv32_bootloader_image.vhd b/rtl/core/neorv32_bootloader_image.vhd
@@ -11,7 +11,7 @@ use neorv32.neorv32_package.all;
 package neorv32_bootloader_image is
 
   constant bootloader_init_image : mem32_t := (
-    00000000 => x"00000013",
+    00000000 => x"00000037",
     00000001 => x"80010117",
     00000002 => x"1f810113",
     00000003 => x"80010197",
@@ -985,8 +985,8 @@ package neorv32_bootloader_image is
     00000971 => x"0a3e3e20",
     00000972 => x"444c420a",
     00000973 => x"4a203a56",
-    00000974 => x"33206e75",
-    00000975 => x"30322030",
+    00000974 => x"32206c75",
+    00000975 => x"30322032",
     00000976 => x"480a3132",
     00000977 => x"203a5657",
     00000978 => x"00000020",

diff --git a/sw/common/crt0.S b/sw/common/crt0.S
@@ -42,7 +42,8 @@ _start:
 .cfi_startproc
 .cfi_undefined ra
 
-  nop
+  lui zero, 0 // dummy instruction that uses no reg-file operands at all
+
 
 // ************************************************************************************************
 // Setup pointers using linker script symbols