Merge branch 'master' into feature/esp32s2beta_merge

components/esp32/ld/esp32.discard-rtti.ld

@@ -0,0 +1,11 @@
+/* This is only included if CONFIG_COMPILER_CXX_RTTI is not set, to
+ * move RTTI sections of libstdc++ to an unused non-loadable memory region.
+ */
+
+SECTIONS
+{
+  .rodata.discard-rtti (NOLOAD):
+  {
+    *libstdc++.a:(.rodata._ZTI* .rodata._ZTS*)
+  } > discard_seg
+}

components/esp32/ld/esp32.ld

@@ -100,6 +100,11 @@ MEMORY
   /* external memory ,including data and text */
   extern_ram_seg(RWX)  :             org = 0x3F800000,
                                      len = 0x400000
+
+  /* This is not a memory range which can really be accessed; we use it as a "bitbucket"
+     where non-loadable sections, which aren't used at run time, can be discarded.
+   */
+  discard_seg (R) :                  org = 0x00000000, len = 0x10000000
 }
 
 #if defined(CONFIG_ESP32_USE_FIXED_STATIC_RAM_SIZE)