enable itcm/dtcm explicitly

quartiq · Mar 29, 2021 · fc73744 · fc73744
1 parent 14bae09
commit fc73744
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/src/startup.S b/src/startup.S
@@ -7,6 +7,22 @@
 .thumb_func
 .cfi_startproc
 __pre_init:
+
+  # Enable ITCM and DTCM
+  ldr r0, =1
+  ldr r1, =0xE000EF90
+  ldr r2, [r1]
+  # Set ITCMCR.EN
+  orr r2, r2, r0
+  str r2, [r1]
+  ldr r1, =0xE000EF94
+  ldr r2, [r1]
+  # Set DTCMCR.EN
+  orr r2, r2, r0
+  str r2, [r1]
+  dsb
+  isb
+
   # Analogous to cortex-m-rt Reset code for .data copying.
   # Initialise .itcm code. `__sitcm`, `__siitcm`, and `__eitcm` come from the
   # linker script. Copy from r2 into r0 until r0 reaches r1.