From 34422d2d912178a6d8f979031320939c0f24fc6e Mon Sep 17 00:00:00 2001
From: Dolu1990 <charles.papon.90@gmail.com>
Date: Fri, 10 Feb 2023 15:57:22 +0100
Subject: [PATCH] cpu/NaxRiscv crt0.S now enable the FPU

---
 litex/soc/cores/cpu/naxriscv/crt0.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/litex/soc/cores/cpu/naxriscv/crt0.S b/litex/soc/cores/cpu/naxriscv/crt0.S
index 0496c84be..8078020fd 100644
--- a/litex/soc/cores/cpu/naxriscv/crt0.S
+++ b/litex/soc/cores/cpu/naxriscv/crt0.S
@@ -2,6 +2,11 @@
 .global isr
 .global _start
 
+#define MSTATUS_FS_INITIAL (1 << 13)
+#define MSTATUS_FS_CLEAN (2 << 13)
+#define MSTATUS_FS_DIRTY (3 << 13)
+#define MSTATUS_FS_MASK (3 << 13)
+
 _start:
   j crt_init
   nop
@@ -57,6 +62,10 @@ crt_init:
   la sp, _fstack
   la a0, trap_entry
   csrw mtvec, a0
+  
+enable_fpu:
+  li x1, MSTATUS_FS_INITIAL
+  csrs mstatus, x1
 
 data_init:
   la a0, _fdata