feat(bootloader): Add configration for output console UART

components/bootloader/subproject/main/esp8266.bootloader.rom.ld

@@ -1,6 +1,7 @@
 PROVIDE ( ets_memcpy = 0x400018b4 );
-PROVIDE ( ets_printf = 0x400024cc );
 
 PROVIDE ( SPIRead = 0x40004b1c );
 
-PROVIDE ( xthal_get_ccount = 0x4000dd38 );
+PROVIDE ( xthal_get_ccount = 0x4000dd38 );
+PROVIDE ( uart_div_modify = 0x400039d8 );
+PROVIDE ( ets_io_vprintf = 0x40001f00 );

components/bootloader_support/src/bootloader_init.c

@@ -547,6 +547,15 @@ void __assert_func(const char *file, int line, const char *func, const char *exp
 #include "esp_flash_partitions.h"
 #include "bootloader_flash.h"
 
+#include "esp8266/uart_register.h"
+#include "esp8266/eagle_soc.h"
+#include "esp8266/gpio_register.h"
+#include "esp8266/pin_mux_register.h"
+#include "esp8266/rom_functions.h"
+
+#define CONFIG_CONSOLE_UART_BAUDRATE 74880
+#define BOOTLOADER_CONSOLE_CLK_FREQ 52 * 1000 * 1000
+
 extern int _bss_start;
 extern int _bss_end;
 extern int _data_start;
@@ -558,6 +567,28 @@ static esp_err_t bootloader_main();
 static void print_flash_info(const esp_image_header_t* pfhdr);
 static void update_flash_config(const esp_image_header_t* pfhdr);
 
+static void uart_console_configure(void)
+{
+#if CONFIG_CONSOLE_UART_NUM == 1
+    PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
+
+    CLEAR_PERI_REG_MASK(UART_CONF1(CONFIG_CONSOLE_UART_NUM), UART_RX_FLOW_EN);
+    CLEAR_PERI_REG_MASK(UART_CONF0(CONFIG_CONSOLE_UART_NUM), UART_TX_FLOW_EN);
+
+    uart_div_modify(CONFIG_CONSOLE_UART_NUM, BOOTLOADER_CONSOLE_CLK_FREQ / CONFIG_CONSOLE_UART_BAUDRATE);
+
+    WRITE_PERI_REG(UART_CONF0(CONFIG_CONSOLE_UART_NUM),
+                   0                // None parity
+                   | (1 << 4)       // 1-bit stop
+                   | (3 << 2)       // 8-bit data
+                   | 0              // None flow control
+                   | 0);            // None Inverse
+
+    SET_PERI_REG_MASK(UART_CONF0(CONFIG_CONSOLE_UART_NUM), UART_RXFIFO_RST | UART_TXFIFO_RST);
+    CLEAR_PERI_REG_MASK(UART_CONF0(CONFIG_CONSOLE_UART_NUM), UART_RXFIFO_RST | UART_TXFIFO_RST);
+#endif
+}
+
 esp_err_t bootloader_init()
 {
     //Clear bss
@@ -571,6 +602,8 @@ esp_err_t bootloader_init()
 
 static esp_err_t bootloader_main()
 {
+    uart_console_configure();
+
     esp_image_header_t fhdr;
     if (bootloader_flash_read(ESP_BOOTLOADER_OFFSET, &fhdr, sizeof(esp_image_header_t), true) != ESP_OK) {
         ESP_LOGE(TAG, "failed to load bootloader header!");

components/esp8266/Kconfig

@@ -35,6 +35,23 @@ config SOC_FULL_ICACHE
         Enable this option, full 32 KB iram instead of 16 KB iram will be used as icache, so the heap use can use
         may reduce a lot.
 
+choice CONSOLE_UART_NUM
+    prompt "UART peripheral to use for console output (0-1)"
+    default CONSOLE_UART_CUSTOM_NUM_0
+    help
+        Configrate output console UART for "ets_printf", "printf", "ESP_LOGX" and so on.
+
+config CONSOLE_UART_CUSTOM_NUM_0
+    bool "UART0"
+config CONSOLE_UART_CUSTOM_NUM_1
+    bool "UART1"
+endchoice
+
+config CONSOLE_UART_NUM
+    int
+    default 0 if CONSOLE_UART_CUSTOM_NUM_0
+    default 1 if CONSOLE_UART_CUSTOM_NUM_1
+
 endmenu
 
 menu WIFI

components/esp8266/source/ets_printf.c

@@ -14,26 +14,24 @@
 
 #include <stdint.h>
 
+#include "sdkconfig.h"
+
 #include "esp_attr.h"
 
 #include "esp8266/eagle_soc.h"
 #include "esp8266/uart_register.h"
 #include "esp8266/rom_functions.h"
 
-#ifndef CONFIG_ETS_PUTC_UART
-#define CONFIG_ETS_PUTC_UART 0
-#endif
-
 int IRAM_ATTR ets_putc(int c)
 {
     while (1) {
-        uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(CONFIG_ETS_PUTC_UART)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
+        uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(CONFIG_CONSOLE_UART_NUM)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
 
         if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126)
             break;
     }
 
-    WRITE_PERI_REG(UART_FIFO(CONFIG_ETS_PUTC_UART) , c);
+    WRITE_PERI_REG(UART_FIFO(CONFIG_CONSOLE_UART_NUM) , c);
 
     return c;
 }