Merge branch 'feature/bss_seg_in_external_memory' into 'master'

memory:   support .bss segment can be in psram

See merge request idf/esp-idf!2236

components/esp32/ld/esp32.common.ld

@@ -229,6 +229,7 @@ SECTIONS
   {
     . = ALIGN (8);
     _bss_start = ABSOLUTE(.);
+    *(.ext_ram.bss*)
     _bt_bss_start = ABSOLUTE(.);
     *libbt.a:(.bss .bss.* COMMON)
     . = ALIGN (4);

components/esp32/ld/esp32.extram.bss.ld

@@ -0,0 +1,17 @@
+/* This section is only included if CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
+   is set, to link some sections to BSS in PSRAM */
+
+SECTIONS
+{
+   /* external memory bss, from any global variable with EXT_RAM_ATTR attribute*/
+  .ext_ram.bss (NOLOAD) :
+  {
+    _ext_ram_bss_start = ABSOLUTE(.);
+    *(.ext_ram.bss*)
+    *libnet80211.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
+    *libpp.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
+    *liblwip.a:(.dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
+    *libbt.a:(EXCLUDE_FILE (libbtdm_app.a) .dynsbss .sbss .sbss.* .gnu.linkonce.sb.* .scommon .sbss2.* .gnu.linkonce.sb2.* .dynbss .bss .bss.* .share.mem .gnu.linkonce.b.* COMMON)
+    _ext_ram_bss_end = ABSOLUTE(.);
+  } > extern_ram_seg
+}

components/esp32/ld/esp32.ld

@@ -71,6 +71,10 @@ MEMORY
   */
   rtc_slow_seg(RW)  :                org = 0x50000000 + CONFIG_ULP_COPROC_RESERVE_MEM,
                                      len = 0x1000 - CONFIG_ULP_COPROC_RESERVE_MEM
+
+  /* external memory ,including data and text */
+  extern_ram_seg(RWX)  :             org = 0x3F800000,
+                                     len = 0x400000
 }
 
 /* Heap ends at top of dram0_0_seg */