esp32: Add config options in Kconfig.board, remove _heap_start symbol

This commit adds config options for supporting multiple memory
allocation using k_malloc()

Update west.yml with hal_espressif change

Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>

soc/xtensa/esp32/Kconfig.soc

@@ -22,12 +22,40 @@ config ESP32_BT_RESERVE_DRAM
 	default 0xdb5c if BT
 	default 0
 
+config ESP_HEAP_MEM_POOL_REGION_1_SIZE
+	int "Internal DRAM region 1 mempool size"
+	default 49152
+	help
+	  ESP32 has two banks of size 192K and 128K which can be used
+	  as DRAM, system heap allocates area from region 0.
+	  This configuration can be used to add memory from region 1
+	  to heap and can be allocated using k_malloc.
+
 config ESP_SPIRAM
 	bool "Support for external, SPI-connected RAM"
 	help
 	  This enables support for an external SPI RAM chip, connected in
 	  parallel with the main SPI flash chip.
 
+config ESP_HEAP_MIN_EXTRAM_THRESHOLD
+	int "Minimum threshold for external RAM allocation"
+	default 8192
+	range 1024 131072
+	depends on ESP_SPIRAM
+	help
+	  Threshold to decide if memory will be allocated from DRAM
+	  or SPIRAM. If value of allocation size is less than this value,
+	  memory will be allocated from internal RAM.
+
+config ESP_HEAP_SEARCH_ALL_REGIONS
+	bool "Search for all available heap regions"
+	depends on ESP_SPIRAM
+	default y
+	help
+	  This configuration enables searching all available heap
+	  regions. If the region of desired capability is exhausted,
+	  memory will be allocated from other available region.
+
 menu "SPI RAM config"
 	depends on ESP_SPIRAM
 
@@ -168,4 +196,4 @@ menu "SPI RAM config"
 		default y
 endmenu
 
-endif # SOC_ESP32
+endif # SOC_ESP32

soc/xtensa/esp32/linker.ld

@@ -468,7 +468,6 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
     *(.noinit)
     *(".noinit.*")
     . = ALIGN (8);
-    _heap_start = ABSOLUTE(.);
   } GROUP_LINK_IN(RAMABLE_REGION_1)
 
 #ifdef CONFIG_GEN_ISR_TABLES