esp_flash: fix coredump for legacy spi flash API

When legacy mode is used, the coredump still fails during linking
because "esp_flash_init_default_chip", "esp_flash_app_init" and
"esp_flash_default_chip " are not compiled and linked.

Instead of using ``if`` macros in callers, these functions are protected
by ``if`` macros in the header, and also not compiled in the sources.
"esp_flash_default_chip" variable is compiled with safe default value.

components/esp32/cpu_start.c

@@ -43,7 +43,7 @@
 #include "sdkconfig.h"
 #include "esp_system.h"
 #include "esp_spi_flash.h"
-#include "esp_flash.h"
+#include "esp_flash_internal.h"
 #include "nvs_flash.h"
 #include "esp_event.h"
 #include "esp_spi_flash.h"

components/spi_flash/CMakeLists.txt

@@ -4,21 +4,24 @@ if(BOOTLOADER_BUILD)
     # need other parts of this component
     set(srcs "spi_flash_rom_patch.c")
 else()
-    set(srcs 
+    set(srcs
         "cache_utils.c"
         "flash_mmap.c"
         "flash_ops.c"
         "partition.c"
         "spi_flash_rom_patch.c"
+    )
+    # New implementation
+    list(APPEND srcs
         "spi_flash_chip_drivers.c"
         "spi_flash_chip_generic.c"
         "spi_flash_chip_issi.c"
         "spi_flash_os_func_app.c"
         "spi_flash_os_func_noos.c"
-        "memspi_host_driver.c")
-    if(NOT CONFIG_SPI_FLASH_USE_LEGACY_IMPL)
-        list(APPEND srcs "esp_flash_api.c" "esp_flash_spi_init.c")
-    endif()
+        "memspi_host_driver.c"
+        "esp_flash_api.c"
+        "esp_flash_spi_init.c"
+    )
     set(priv_requires bootloader_support app_update soc)
 endif()
 

components/spi_flash/esp_flash_api.c

@@ -294,14 +294,15 @@ esp_err_t IRAM_ATTR esp_flash_erase_region(esp_flash_t *chip, uint32_t start, ui
         return ESP_ERR_INVALID_ARG;
     }
 
-    esp_err_t err = spiflash_start(chip);
-    if (err != ESP_OK) {
-        return err;
-    }
-
+    esp_err_t err = ESP_OK;
     // Check for write protected regions overlapping the erase region
     if (chip->chip_drv->get_protected_regions != NULL &&
         chip->chip_drv->num_protectable_regions > 0) {
+
+        err = spiflash_start(chip);
+        if (err != ESP_OK) {
+            return err;
+        }
         uint64_t protected = 0;
         err = chip->chip_drv->get_protected_regions(chip, &protected);
         if (err == ESP_OK && protected != 0) {
@@ -313,10 +314,10 @@ esp_err_t IRAM_ATTR esp_flash_erase_region(esp_flash_t *chip, uint32_t start, ui
                 }
             }
         }
+        // Don't lock the SPI flash for the entire erase, as this may be very long
+        err = spiflash_end(chip, err);
     }
 
-    // Don't lock the SPI flash for the entire erase, as this may be very long
-    err = spiflash_end(chip, err);
 
     while (err == ESP_OK && len >= sector_size) {
         err = spiflash_start(chip);

components/spi_flash/esp_flash_spi_init.c

@@ -23,7 +23,7 @@
 #include "hal/spi_types.h"
 #include "driver/spi_common.h"
 
-static const char TAG[] = "spi_flash";
+__attribute__((unused)) static const char TAG[] = "spi_flash";
 
 #ifdef CONFIG_ESPTOOLPY_FLASHFREQ_80M
 #define DEFAULT_FLASH_SPEED ESP_FLASH_80MHZ
@@ -49,6 +49,18 @@ static const char TAG[] = "spi_flash";
 #define DEFAULT_FLASH_MODE SPI_FLASH_FASTRD
 #endif
 
+#define ESP_FLASH_HOST_CONFIG_DEFAULT()  (memspi_host_config_t){ \
+    .host_id = SPI_HOST,\
+    .speed = DEFAULT_FLASH_SPEED, \
+    .cs_num = 0, \
+    .iomux = false, \
+    .input_delay_ns = 0,\
+}
+
+
+esp_flash_t *esp_flash_default_chip = NULL;
+
+
 static IRAM_ATTR void cs_initialize(esp_flash_t *chip, const esp_flash_spi_device_config_t *config, bool use_iomux)
 {
     //Not using spicommon_cs_initialize since we don't want to put the whole
@@ -151,20 +163,15 @@ esp_err_t spi_bus_remove_flash_device(esp_flash_t *chip)
     return ESP_OK;
 }
 
-#define ESP_FLASH_HOST_CONFIG_DEFAULT()  (memspi_host_config_t){ \
-    .host_id = SPI_HOST,\
-    .speed = DEFAULT_FLASH_SPEED, \
-    .cs_num = 0, \
-    .iomux = false, \
-    .input_delay_ns = 0,\
-}
 
-static DRAM_ATTR spi_flash_host_driver_t esp_flash_default_host_drv = ESP_FLASH_DEFAULT_HOST_DRIVER();
+/* The default (ie initial boot) no-OS ROM esp_flash_os_functions_t */
+extern const esp_flash_os_functions_t esp_flash_noos_functions;
+
+#ifndef CONFIG_SPI_FLASH_USE_LEGACY_IMPL
 
 static DRAM_ATTR memspi_host_data_t default_driver_data;
+static DRAM_ATTR spi_flash_host_driver_t esp_flash_default_host_drv = ESP_FLASH_DEFAULT_HOST_DRIVER();
 
-/* The default (ie initial boot) no-OS ROM esp_flash_os_functions_t */
-extern const esp_flash_os_functions_t esp_flash_noos_functions;
 
 static DRAM_ATTR esp_flash_t default_chip = {
     .read_mode = DEFAULT_FLASH_MODE,
@@ -172,8 +179,6 @@ static DRAM_ATTR esp_flash_t default_chip = {
     .os_func = &esp_flash_noos_functions,
 };
 
-esp_flash_t *esp_flash_default_chip = NULL;
-
 esp_err_t esp_flash_init_default_chip()
 {
     memspi_host_config_t cfg = ESP_FLASH_HOST_CONFIG_DEFAULT();
@@ -204,3 +209,5 @@ esp_err_t esp_flash_app_init()
 {
     return esp_flash_init_os_functions(&default_chip, 0);
 }
+
+#endif

components/spi_flash/include/esp_flash.h

@@ -265,33 +265,6 @@ esp_err_t esp_flash_write_encrypted(esp_flash_t *chip, uint32_t address, const v
 */
 extern esp_flash_t *esp_flash_default_chip;
 
-/** @brief Initialise the default SPI flash chip
- *
- * Called by OS startup code. You do not need to call this in your own applications.
- */
-esp_err_t esp_flash_init_default_chip();
-
-/**
- *  Enable OS-level SPI flash protections in IDF
- *
- *  Called by OS startup code. You do not need to call this in your own applications.
- *
- * @return ESP_OK if success, otherwise failed. See return value of ``esp_flash_init_os_functions``.
- */
-esp_err_t esp_flash_app_init();
-
-/**
- *  Enable OS-level SPI flash for a specific chip.
- *
- * @param chip The chip to init os functions.
- * @param host_id Which SPI host to use, 1 for SPI1, 2 for SPI2 (HSPI), 3 for SPI3 (VSPI)
- *
- * @return
- *      - ESP_OK if success
- *      - ESP_ERR_INVALID_ARG if host_id is invalid
- */
-esp_err_t esp_flash_init_os_functions(esp_flash_t *chip, int host_id);
-
 
 #ifdef __cplusplus
 }

components/spi_flash/include/esp_flash_internal.h

@@ -0,0 +1,68 @@
+// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include "esp_err.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include "sdkconfig.h"
+
+#include "esp_flash.h"
+
+/** Internal API, don't use in the applications */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/** @brief Initialise the default SPI flash chip
+ *
+ * Called by OS startup code. You do not need to call this in your own applications.
+ */
+#ifdef CONFIG_SPI_FLASH_USE_LEGACY_IMPL
+#define esp_flash_init_default_chip(...) ({ESP_OK;})
+#else
+esp_err_t esp_flash_init_default_chip(void);
+#endif
+
+/**
+ *  Enable OS-level SPI flash protections in IDF
+ *
+ *  Called by OS startup code. You do not need to call this in your own applications.
+ *
+ * @return ESP_OK if success, otherwise failed. See return value of ``esp_flash_init_os_functions``.
+ */
+#ifdef CONFIG_SPI_FLASH_USE_LEGACY_IMPL
+#define esp_flash_app_init(...) ({ESP_OK;})
+#else
+esp_err_t esp_flash_app_init(void);
+#endif
+
+/**
+ *  Initialize OS-level functions for a specific chip.
+ *
+ * @param chip The chip to init os functions.
+ * @param host_id Which SPI host to use, 1 for SPI1, 2 for SPI2 (HSPI), 3 for SPI3 (VSPI)
+ *
+ * @return
+ *      - ESP_OK if success
+ *      - ESP_ERR_INVALID_ARG if host_id is invalid
+ */
+esp_err_t esp_flash_init_os_functions(esp_flash_t *chip, int host_id);
+
+
+#ifdef __cplusplus
+}
+#endif