enable M4 fpu earlier else it crashes

mean00 · Jan 23, 2021 · ab73585 · ab73585
1 parent 2af5aa7
commit ab73585
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Showing 2 changed files with 18 additions and 0 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -15,6 +15,7 @@ include(applyPatch)
 #
 include(./platformConfig.cmake)
 APPLY_PATCH_IF_NEEDED(patched gd32_patch.diff              "add gd32f303 support") 
+APPLY_PATCH_IF_NEEDED(patchedm4 m4_activate_fpu.diff       "activate m4 fpu (gd32f303)") 
 
 
 cmake_minimum_required(VERSION 2.8)

diff --git a/patches/m4_activate_fpu.diff b/patches/m4_activate_fpu.diff
@@ -0,0 +1,17 @@
+--- a/STM32F1/variants/generic_gd32f303c/wirish/boards_setup.cpp	2021-01-23 10:40:52.302219033 +0100
++++ b/STM32F1/variants/generic_gd32f303c/wirish/boards_setup.cpp	2021-01-21 18:21:33.188439887 +0100
+@@ -98,6 +98,14 @@
+                 #elif F_CPU == 48000000
+ 			rcc_set_prescaler(RCC_PRESCALER_USB, RCC_USB_SYSCLK_DIV_1);			
+                 #endif	
++
++        // Activate FPU Here, asap !
++        uint32_t    *cpacr=(uint32_t *) 0xE000ED88;
++        uint32_t v=cpacr[0];
++        v|=0xF<<20;
++        cpacr[0]=v;
++
++
+         }
+
+         __weak void board_setup_gpio(void) {