From 75fcd062e8bfea7e97317a4b31dc51af796ff135 Mon Sep 17 00:00:00 2001
From: Ivan Grokhotkov <ivan@espressif.com>
Date: Wed, 19 Sep 2018 11:34:34 +0800
Subject: [PATCH] esp32: abort when running on single core chip in dual core
 mode

Ref. https://esp32.com/viewtopic.php?f=2&t=7307
---
 components/esp32/cpu_start.c        | 6 ++++++
 docs/en/get-started-cmake/index.rst | 5 +++++
 docs/en/get-started/index.rst       | 5 +++++
 docs/zh_CN/get-started/index.rst    | 4 ++++
 4 files changed, 20 insertions(+)

diff --git a/components/esp32/cpu_start.c b/components/esp32/cpu_start.c
index 4d907f333c..abe142a4fc 100644
--- a/components/esp32/cpu_start.c
+++ b/components/esp32/cpu_start.c
@@ -29,6 +29,7 @@
 #include "soc/io_mux_reg.h"
 #include "soc/rtc_cntl_reg.h"
 #include "soc/timer_group_reg.h"
+#include "soc/efuse_reg.h"
 
 #include "driver/rtc_io.h"
 
@@ -163,6 +164,11 @@ void IRAM_ATTR call_start_cpu0()
     ESP_EARLY_LOGI(TAG, "Pro cpu up.");
 
 #if !CONFIG_FREERTOS_UNICORE
+    if (REG_GET_BIT(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_DIS_APP_CPU)) {
+        ESP_EARLY_LOGE(TAG, "Running on single core chip, but application is built with dual core support.");
+        ESP_EARLY_LOGE(TAG, "Please enable CONFIG_FREERTOS_UNICORE option in menuconfig.");
+        abort();
+    }
     ESP_EARLY_LOGI(TAG, "Starting app cpu, entry point is %p", call_start_cpu1);
     //Flush and enable icache for APP CPU
     Cache_Flush(1);
diff --git a/docs/en/get-started-cmake/index.rst b/docs/en/get-started-cmake/index.rst
index 8b3318a40b..ab4557f542 100644
--- a/docs/en/get-started-cmake/index.rst
+++ b/docs/en/get-started-cmake/index.rst
@@ -248,6 +248,11 @@ Here are couple of tips on navigation and use of ``menuconfig``:
 * Pressing ``?`` while highlighting a configuration item displays help about that item.
 * Type ``/`` to search the configuration items.
 
+.. attention::
+
+    When using ESP32-DevKitC board with ESP32-SOLO-1 module, enable single core mode (:envvar:`CONFIG_FREERTOS_UNICORE`) in menuconfig before flashing example applications.
+
+
 .. _get-started-build-cmake:
 
 Build The Project
diff --git a/docs/en/get-started/index.rst b/docs/en/get-started/index.rst
index 188b6938d4..9d5dddad4d 100644
--- a/docs/en/get-started/index.rst
+++ b/docs/en/get-started/index.rst
@@ -204,6 +204,11 @@ Here are couple of tips on navigation and use of ``menuconfig``:
     If you are **Arch Linux** user, navigate to ``SDK tool configuration`` and change the name of ``Python 2 interpreter`` from ``python`` to ``python2``.
 
 
+.. attention::
+
+    When using ESP32-DevKitC board with ESP32-SOLO-1 module, enable single core mode (:envvar:`CONFIG_FREERTOS_UNICORE`) in menuconfig before flashing example applications.
+
+
 .. _get-started-build-flash:
 
 Build and Flash
diff --git a/docs/zh_CN/get-started/index.rst b/docs/zh_CN/get-started/index.rst
index 043569da5d..e585f74c20 100644
--- a/docs/zh_CN/get-started/index.rst
+++ b/docs/zh_CN/get-started/index.rst
@@ -200,6 +200,10 @@ ESP-IDF 的 :idf:`examples` 目录下有一系列示例工程，都可以按照
 
     如果你是 **Arch Linux** 用户，需要进入 ``SDK tool configuration`` 将 ``Python 2 interpreter`` 从 ``python`` 修改为 ``python2``。
 
+.. attention::
+
+    如果 ESP32-DevKitC 板载的是 ESP32-SOLO-1 模组，请务必在烧写示例程序之前在 menuconfig 中使能单核模式（:envvar:`CONFIG_FREERTOS_UNICORE`）。
+
 
 .. _get-started-build-flash: