important fix

Author: robamu

cortex-ar/src/mmu.rs

@@ -285,6 +285,7 @@ impl L1Section {
     /// Set the section attributes without changing the address.
     #[inline]
     pub const fn set_section_attrs(&mut self, section_attrs: SectionAttributes) {
-        self.raw_value = self.base_addr().value() as u32 | section_attrs.l1_section_part().raw_value();
+        self.raw_value =
+            ((self.base_addr().value() as u32) << 20) | section_attrs.l1_section_part().raw_value();
     }
 }