soc: xtensa: espressif_esp32: add SPIRAM heap offset and size

The existing heap starts at the beginning of SPIRAM which is also occupied
by the WiFi stack if CONFIG_ESP32_WIFI_NET_ALLOC_SPIRAM is enabled.  This
results in memory corruption.

Update the linker description to add a _spiram_heap_start symbol and add a
KConfig size option to allow the SPIRAM stack to be correctly located and
sized.  Requires matching commit in hal_espressif.

Fixes: 61359

Signed-off-by: Eric Holmberg <eric.holmberg@northriversystems.co.nz>

soc/xtensa/espressif_esp32/common/Kconfig.soc

@@ -37,6 +37,14 @@ config ESP_HEAP_SEARCH_ALL_REGIONS
 	  regions. If the region of desired capability is exhausted,
 	  memory will be allocated from other available region.
 
+config ESP_SPIRAM_HEAP_SIZE
+	int "Size of SPIRAM heap"
+	default 262134 if SYS_HEAP_SMALL_ONLY
+	default 1048576 if !SYS_HEAP_SMALL_ONLY
+	depends on ESP_SPIRAM
+	help
+	  Specify size of SPIRAM heap.
+
 menu "SPI RAM config"
 	depends on ESP_SPIRAM
 

soc/xtensa/espressif_esp32/esp32/default.ld

@@ -453,9 +453,12 @@ SECTIONS
     *libsubsys__net__ip.a:(.noinit .noinit.*)
     *libsubsys__net.a:(.noinit .noinit.*)
 #endif
+    _spiram_heap_start = ABSOLUTE(.);
+    . = . + CONFIG_ESP_SPIRAM_HEAP_SIZE;
 
     *(.ext_ram.bss*)
-    _ext_ram_data_end = ABSOLUTE(.) + CONFIG_ESP_SPIRAM_SIZE;
+
+    _ext_ram_data_end = ABSOLUTE(.);
   } GROUP_LINK_IN(ext_ram_seg)
 #endif
 
@@ -581,3 +584,8 @@ _heap_sentry = 0x3ffe3f20;
 
 ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),
           "IRAM0 segment data does not fit.")
+
+#if defined(CONFIG_ESP_SPIRAM)
+ASSERT(((_ext_ram_data_end - _ext_ram_data_start) <= CONFIG_ESP_SPIRAM_SIZE),
+          "External SPIRAM overflowed.")
+#endif /* CONFIG_ESP_SPIRAM */

soc/xtensa/espressif_esp32/esp32s2/default.ld

@@ -333,6 +333,7 @@ SECTIONS
 #if defined(CONFIG_ESP_SPIRAM)
   .ext_ram.bss (NOLOAD):
   {
+    _ext_ram_data_start = ABSOLUTE(.);
     _ext_ram_bss_start = ABSOLUTE(.);
 
 #if defined(CONFIG_ESP32_WIFI_NET_ALLOC_SPIRAM)
@@ -342,10 +343,14 @@ SECTIONS
     *libsubsys__net__ip.a:(.noinit .noinit.*)
     *libsubsys__net.a:(.noinit .noinit.*)
 #endif
+    _spiram_heap_start = ABSOLUTE(.);
+    . = . + CONFIG_ESP_SPIRAM_HEAP_SIZE;
 
     *(.ext_ram.bss*)
     . = ALIGN(4);
-    _ext_ram_bss_end = ABSOLUTE(.) + CONFIG_ESP_SPIRAM_SIZE;
+    _ext_ram_bss_end = ABSOLUTE(.);
+
+    _ext_ram_data_end = ABSOLUTE(.);
   } > ext_ram_seg
 #endif
 
@@ -555,3 +560,8 @@ ASSERT(((__bss_end - ORIGIN(dram0_0_seg)) <= LENGTH(dram0_0_seg)),
 
 ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),
           "IRAM0 segment data does not fit.")
+
+#if defined(CONFIG_ESP_SPIRAM)
+ASSERT(((_ext_ram_data_end - _ext_ram_data_start) <= CONFIG_ESP_SPIRAM_SIZE),
+          "External SPIRAM overflowed.")
+#endif /* CONFIG_ESP_SPIRAM */

soc/xtensa/espressif_esp32/esp32s3/default.ld

@@ -231,6 +231,7 @@ SECTIONS
   /* This section holds .ext_ram.bss data, and will be put in PSRAM */
   .ext_ram.bss (NOLOAD) :
   {
+    _ext_ram_data_start = ABSOLUTE(.);
     _ext_ram_bss_start = ABSOLUTE(.);
     *(.ext_ram.bss*)
     . = ALIGN(4);
@@ -246,6 +247,10 @@ SECTIONS
     *libsubsys__net__ip.a:(.noinit .noinit.*)
     *libsubsys__net.a:(.noinit .noinit.*)
 #endif
+    _spiram_heap_start = ABSOLUTE(.);
+    . = . + CONFIG_ESP_SPIRAM_HEAP_SIZE;
+
+    _ext_ram_data_end = ABSOLUTE(.);
   } > ext_ram_seg
 #endif
 
@@ -678,6 +683,6 @@ ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),
           "IRAM0 segment data does not fit.")
 
 #if defined(CONFIG_ESP_SPIRAM)
-ASSERT(((ORIGIN(ext_ram_seg)) > _image_rodata_end),
-          "External RAM segment does not fit.")
-#endif
+ASSERT(((_ext_ram_data_end - _ext_ram_data_start) <= CONFIG_ESP_SPIRAM_SIZE),
+          "External SPIRAM overflowed.")
+#endif /* CONFIG_ESP_SPIRAM */

tests/boards/espressif_esp32/cache_coex/prj.conf

@@ -1,7 +1,6 @@
 CONFIG_ESP_SPIRAM=y
 CONFIG_ESP_HEAP_MIN_EXTRAM_THRESHOLD=2048
 CONFIG_HEAP_MEM_POOL_SIZE=98304
-CONFIG_ESP_HEAP_MEM_POOL_REGION_1_SIZE=100000
 CONFIG_ESP_HEAP_SEARCH_ALL_REGIONS=n
 CONFIG_FLASH=y
 CONFIG_ENTROPY_GENERATOR=y

west.yml

@@ -152,7 +152,7 @@ manifest:
       groups:
         - hal
     - name: hal_espressif
-      revision: ec90f3c49e3826ef2c56c5381aa068c4f482b31f
+      revision: 80d910ca89eab9bce03f59a4ade33f1fc30ce0ad
       path: modules/hal/espressif
       west-commands: west/west-commands.yml
       groups: