ESP32: Fix heap initialization

arch/xtensa/src/common/xtensa.h

@@ -183,18 +183,14 @@ extern void g_intstackbase;
 extern uint32_t _init_start;        /* Start of initialization logic */
 extern uint32_t _stext;             /* Start of .text */
 extern uint32_t _etext;             /* End+1 of .text + .rodata */
-extern const uint32_t _data_loaddr; /* Start of .data in FLASH */
 extern uint32_t _sdata;             /* Start of .data */
 extern uint32_t _edata;             /* End+1 of .data */
+extern uint32_t _srodata;           /* Start of .rodata */
+extern uint32_t _erodata;           /* End+1 of .rodata */
 extern uint32_t _sbss;              /* Start of .bss */
 extern uint32_t _ebss;              /* End+1 of .bss */
-#ifdef CONFIG_ARCH_RAMFUNCS
-extern uint32_t _sramfunc;          /* Start of ramfuncs */
-extern uint32_t _eramfunc;          /* End+1 of ramfuncs */
-extern uint32_t _ramfunc_loadaddr;  /* Start of ramfuncs in FLASH */
-extern uint32_t _ramfunc_sizeof;    /* Size of ramfuncs */
-#endif /* CONFIG_ARCH_RAMFUNCS */
-#endif /* __ASSEMBLY__ */
+extern uint32_t _sheap;             /* Start of heap */
+extern uint32_t _eheap;             /* End+1 of heap */
 
 /****************************************************************************
  * Inline Functions

arch/xtensa/src/esp32/esp32_allocateheap.c

@@ -67,11 +67,13 @@
  *
  ****************************************************************************/
 
+#warning REVISIT heap.  Do what with non-heterogeneous memory?
+
 void up_allocate_heap(FAR void **heap_start, size_t *heap_size)
 {
   board_autoled_on(LED_HEAPALLOCATE);
-  *heap_start = (FAR void *)g_idle_topstack;
-  *heap_size = CONFIG_RAM_END - g_idle_topstack;
+  *heap_start = (FAR void *)&_sheap;
+  *heap_size = (size_t)((uintptr_t)&_eheap - (uintptr_t)&_sheap);
 }
 
 /****************************************************************************

arch/xtensa/src/esp32/esp32_start.c

@@ -85,16 +85,6 @@ void IRAM_ATTR __start(void)
 
   memset(&_sbss, 0, (&_ebss - &_sbss) * sizeof(_sbss));
 
-#warning Missing logic: Initialize .data
-
-#warning REVISIT heap.  Do what with non-heterogeneous memory?
-#warning REVISIT belongs in up_allocateheap()
-#if 0
-  /* Initialize heap allocator */
-
-  heap_alloc_caps_init();
-#endif
-
   /* Make sure that the APP_CPU is disabled for now */
 
   regval  = getreg32(DPORT_APPCPU_CTRL_B_REG);

configs/esp32-core/scripts/esp32.template

@@ -59,4 +59,4 @@ MEMORY
 
 /* Heap ends at top of dram0_0_seg */
 
-_heap_end = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM;
+_eheap = 0x40000000 - CONFIG_ESP32_TRACEMEM_RESERVE_DRAM;

configs/esp32-core/scripts/esp32_common.ld

@@ -56,7 +56,6 @@ SECTIONS
 
     _iram_text_start = ABSOLUTE(.);
     *(.iram1 .iram1.*)
-    *libfreertos.a:(.literal .text .literal.* .text.*)
     *libphy.a:(.literal .text .literal.* .text.*)
     *librtc.a:(.literal .text .literal.* .text.*)
     *libpp.a:(.literal .text .literal.* .text.*)
@@ -90,7 +89,7 @@ SECTIONS
 
   .dram0.data :
   {
-    _data_start = ABSOLUTE(.);
+    _sdata = ABSOLUTE(.);
     KEEP(*(.data))
     KEEP(*(.data.*))
     KEEP(*(.gnu.linkonce.d.*))
@@ -103,14 +102,14 @@ SECTIONS
     KEEP(*(.gnu.linkonce.s2.*))
     KEEP(*(.jcr))
     *(.dram1 .dram1.*)
-    _data_end = ABSOLUTE(.);
+    _edata = ABSOLUTE(.);
     . = ALIGN(4);
-    _heap_start = ABSOLUTE(.);
+    _sheap = ABSOLUTE(.);
   } >dram0_0_seg
 
   .flash.rodata :
   {
-    _rodata_start = ABSOLUTE(.);
+    _srodata = ABSOLUTE(.);
     *(.rodata)
     *(.rodata.*)
     *(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
@@ -122,7 +121,9 @@ SECTIONS
     *(.gnu.linkonce.e.*)
     *(.gnu.version_r)
     *(.eh_frame)
+
     . = (. + 3) & ~ 3;
+
     /*  C++ constructor and destructor tables, properly ordered:  */
     __init_array_start = ABSOLUTE(.);
     KEEP (*crtbegin.o(.ctors))
@@ -134,7 +135,9 @@ SECTIONS
     KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
     KEEP (*(SORT(.dtors.*)))
     KEEP (*(.dtors))
+
     /*  C++ exception handlers table:  */
+
     __XT_EXCEPTION_DESCS_ = ABSOLUTE(.);
     *(.xt_except_desc)
     *(.gnu.linkonce.h.*)
@@ -142,7 +145,7 @@ SECTIONS
     *(.xt_except_desc_end)
     *(.dynamic)
     *(.gnu.version_d)
-    _rodata_end = ABSOLUTE(.);
+    _erodata = ABSOLUTE(.);
     /* Literals are also RO data. */
     _lit4_start = ABSOLUTE(.);
     *(*.lit4)