static void clock_configure(void)
{
+ // ROM bootloader may have put a lot of text into UART0 FIFO.
+ // Wait for it to be printed.
+ // This is not needed on power on reset, when ROM bootloader is running at
+ // 40 MHz. But in case of TG WDT reset, CPU may still be running at >80 MHZ,
+ // and will be done with the bootloader much earlier than UART FIFO is empty.
+ uart_tx_wait_idle(0);
+
/* Set CPU to 80MHz. Keep other clocks unmodified. */
rtc_cpu_freq_t cpu_freq = RTC_CPU_FREQ_80M;
uartAttach();
ets_install_uart_printf();
- // ROM bootloader may have put a lot of text into UART0 FIFO.
- // Wait for it to be printed.
+ // Wait for UART FIFO to be empty.
uart_tx_wait_idle(0);
#if CONFIG_CONSOLE_UART_CUSTOM