feat(esp8266): Add config to choose console UART none

components/bootloader_support/src/bootloader_init.c

@@ -568,7 +568,7 @@ static void update_flash_config(const esp_image_header_t* pfhdr);
 
 static void uart_console_configure(void)
 {
-#if CONFIG_CONSOLE_UART_SWAP_IO
+#if CONFIG_UART0_SWAP_IO
     while (READ_PERI_REG(UART_STATUS(0)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S));
 
     PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_UART0_CTS);
@@ -595,7 +595,9 @@ static void uart_console_configure(void)
     CLEAR_PERI_REG_MASK(UART_CONF0(CONFIG_CONSOLE_UART_NUM), UART_RXFIFO_RST | UART_TXFIFO_RST);
 #endif
 
+#ifdef CONFIG_CONSOLE_UART_BAUDRATE
     uart_div_modify(CONFIG_CONSOLE_UART_NUM, BOOTLOADER_CONSOLE_CLK_FREQ / CONFIG_CONSOLE_UART_BAUDRATE);
+#endif
 }
 
 esp_err_t bootloader_init()

components/esp8266/Kconfig

@@ -81,8 +81,27 @@ config SOC_IRAM_SIZE
     default 0x8000 if SOC_FULL_ICACHE
     default 0xC000 if !SOC_FULL_ICACHE
 
+choice CONSOLE_UART
+    prompt "UART for console output"
+    default CONSOLE_UART_DEFAULT
+    help
+        Select whether to use UART for console output (through stdout and stderr).
+
+        - Default is to use UART0.
+        - If "Custom" is selected, UART0 or UART1 can be chosen.
+        - If "None" is selected, there will be no console output on any UART.
+
+config CONSOLE_UART_DEFAULT
+    bool "Default: UART0"
+config CONSOLE_UART_CUSTOM
+    bool "Custom"
+config CONSOLE_UART_NONE
+    bool "None"
+endchoice
+
 choice CONSOLE_UART_NUM
     prompt "UART peripheral to use for console output (0-1)"
+    depends on CONSOLE_UART_CUSTOM
     default CONSOLE_UART_CUSTOM_NUM_0
     help
         Configrate output console UART for "ets_printf", "printf", "ESP_LOGX" and so on.
@@ -95,15 +114,17 @@ endchoice
 
 config CONSOLE_UART_NUM
     int
+    default 0 if CONSOLE_UART_DEFAULT || CONSOLE_UART_NONE
     default 0 if CONSOLE_UART_CUSTOM_NUM_0
     default 1 if CONSOLE_UART_CUSTOM_NUM_1
 
 config CONSOLE_UART_BAUDRATE
     int "UART console baud rate"
+    depends on CONSOLE_UART_DEFAULT || CONSOLE_UART_NONE
     default 74880
     range 1200 4000000
 
-config CONSOLE_UART_SWAP_IO
+config UART0_SWAP_IO
     bool "Swap UART0 I/O pins"
     default n
     help

components/esp8266/source/ets_printf.c

@@ -23,6 +23,7 @@
 #include "esp8266/uart_register.h"
 #include "esp8266/rom_functions.h"
 
+#ifndef CONFIG_CONSOLE_UART_NONE
 static void uart_putc(int c)
 {
     while (1) {
@@ -34,8 +35,11 @@ static void uart_putc(int c)
 
     WRITE_PERI_REG(UART_FIFO(CONFIG_CONSOLE_UART_NUM) , c);
 }
+#else
+#define uart_putc(_c) { }
+#endif
 
-int ets_putc(int c)
+int __attribute__ ((weak)) ets_putc(int c)
 {
 #ifdef CONFIG_NEWLIB_STDOUT_LINE_ENDING_CRLF
     if (c == '\n')

components/esp8266/source/phy_init.c

@@ -69,6 +69,11 @@ esp_err_t esp_phy_rf_init(const esp_phy_init_data_t *init_data, esp_phy_calibrat
     esp_err_t status = ESP_OK;
     uint8_t sta_mac[6];
     uint8_t *local_init_data = calloc(1, 256);
+#ifdef CONFIG_CONSOLE_UART_BAUDRATE
+    const uint32_t uart_baudrate = CONFIG_CONSOLE_UART_BAUDRATE;
+#else
+    const uint32_t uart_baudrate = 74880; // ROM default baudrate
+#endif
 
     memcpy(local_init_data, init_data->params, 128);
 
@@ -84,7 +89,7 @@ esp_err_t esp_phy_rf_init(const esp_phy_init_data_t *init_data, esp_phy_calibrat
     }
 
     esp_efuse_mac_get_default(sta_mac);
-    chip_init(local_init_data, sta_mac, CONFIG_CONSOLE_UART_BAUDRATE);
+    chip_init(local_init_data, sta_mac, uart_baudrate);
     get_data_from_rtc((uint8_t *)calibration_data);
 
     memcpy(rx_gain_dc_table, calibration_data->rx_gain_dc_table, 4 * 125);