bootloader: disable XMC startup flow by default to reduce bootloader size

components/bootloader/Kconfig.projbuild

@@ -233,14 +233,15 @@ menu "Bootloader config"
             It allow to test anti-rollback implemention without permanent write eFuse bits.
             In partition table should be exist this partition `emul_efuse, data, 5, , 0x2000`.
 
-    config BOOTLOADER_FLASH_XMC_SUPPORT
+    config BOOTLOADER_FLASH_XMC_SUPPORT_ENA
         bool "Enable the support for flash chips of XMC (READ HELP FIRST)"
-        default y
+        default n
         help
             Perform the startup flow recommended by XMC. Please consult XMC for the details of this flow.
             XMC chips will be forbidden to be used, when this option is disabled.
 
-            DON'T DISABLE THIS UNLESS YOU KNOW WHAT YOU ARE DOING.
+            Due to the limitation of Flash size, this flow is disabled by default on IDF v3.3. You may need to disable
+            some bootloader features to enable it.
 
 endmenu  # Bootloader
 

components/bootloader_support/src/bootloader_init.c

@@ -146,12 +146,14 @@ static esp_err_t bootloader_main()
     bootloader_clock_configure();
     uart_console_configure();
 
+#if CONFIG_BOOTLOADER_FLASH_XMC_SUPPORT_ENA
     /* Check and run XMC startup flow. The function depends on the clock and console, so it's run right after these stuff
      * are initialized. */
     if (bootloader_flash_xmc_startup() != ESP_OK) {
         ESP_LOGE(TAG, "failed when running XMC startup flow, reboot!");
         return ESP_FAIL;
     }
+#endif
 
     wdt_reset_check();
     ESP_LOGI(TAG, "ESP-IDF %s 2nd stage bootloader", IDF_VER);

components/bootloader_support/src/flash_qio_mode.c

@@ -264,8 +264,6 @@ IRAM_ATTR static uint32_t bootloader_flash_execute_command_common(
     uint8_t mosi_len, uint32_t mosi_data,
     uint8_t miso_len)
 {
-    assert(mosi_len <= 32);
-    assert(miso_len <= 32);
     uint32_t old_ctrl_reg = SPIFLASH.ctrl.val;
     uint32_t old_user_reg = SPIFLASH.user.val;
     uint32_t old_user1_reg = SPIFLASH.user1.val;
@@ -320,26 +318,11 @@ static uint32_t IRAM_ATTR execute_flash_command(uint8_t command, uint32_t mosi_d
             dummy_len, mosi_len, mosi_data, miso_len);
 }
 
-// cmd(0x5A) + 24bit address + 8 cycles dummy
-uint32_t IRAM_ATTR bootloader_flash_read_sfdp(uint32_t sfdp_addr, unsigned int miso_byte_num)
-{
-    assert(miso_byte_num <= 4);
-    const uint8_t command = CMD_RDSFDP;
-    const uint8_t addr_len = 24;
-    const uint8_t dummy_len = 8;
-    const uint8_t mosi_len = 0;
-    const uint32_t mosi_data = 0;
-    const uint8_t miso_len = miso_byte_num * 8;
-
-    return bootloader_flash_execute_command_common(command, addr_len, sfdp_addr,
-            dummy_len, mosi_len, mosi_data, miso_len);
-}
-
 /*******************************************************************************
  * XMC startup flow
  ******************************************************************************/
 
-#define XMC_SUPPORT CONFIG_BOOTLOADER_FLASH_XMC_SUPPORT
+#define XMC_SUPPORT CONFIG_BOOTLOADER_FLASH_XMC_SUPPORT_ENA
 #define XMC_VENDOR_ID 0x20
 
 #if BOOTLOADER_BUILD
@@ -360,7 +343,21 @@ uint32_t IRAM_ATTR bootloader_flash_read_sfdp(uint32_t sfdp_addr, unsigned int m
 
 #endif
 
-#if XMC_SUPPORT
+#if XMC_SUPPORT || !BOOTLOADER_BUILD
+// cmd(0x5A) + 24bit address + 8 cycles dummy
+uint32_t IRAM_ATTR bootloader_flash_read_sfdp(uint32_t sfdp_addr, unsigned int miso_byte_num)
+{
+    const uint8_t command = CMD_RDSFDP;
+    const uint8_t addr_len = 24;
+    const uint8_t dummy_len = 8;
+    const uint8_t mosi_len = 0;
+    const uint32_t mosi_data = 0;
+    const uint8_t miso_len = miso_byte_num * 8;
+
+    return bootloader_flash_execute_command_common(command, addr_len, sfdp_addr,
+            dummy_len, mosi_len, mosi_data, miso_len);
+}
+
 //strictly check the model
 static IRAM_ATTR bool is_xmc_chip_strict(uint32_t rdid)
 {
@@ -421,29 +418,10 @@ esp_err_t IRAM_ATTR bootloader_flash_xmc_startup(void)
     // Read flash ID and check again
     g_rom_flashchip.device_id = bootloader_read_flash_id();
     if (!is_xmc_chip_strict(g_rom_flashchip.device_id)) {
-        BOOTLOADER_FLASH_LOG(E, "XMC flash startup fail");
         return ESP_FAIL;
     }
 
     return ESP_OK;
 }
 
-#else
-//only compare the vendor id
-static IRAM_ATTR bool is_xmc_chip(uint32_t rdid)
-{
-    uint32_t vendor_id = (rdid >> 16) & 0xFF;
-    return (vendor_id == XMC_VENDOR_ID);
-}
-
-esp_err_t IRAM_ATTR bootloader_flash_xmc_startup(void)
-{
-    if (is_xmc_chip(g_rom_flashchip.device_id)) {
-        BOOTLOADER_FLASH_LOG(E, "XMC chip detected (%08X) while support disabled.", g_rom_flashchip.device_id);
-        return ESP_FAIL;
-    }
-    return ESP_OK;
-}
-
 #endif //XMC_SUPPORT
-