esp8266: Reset "virtual RTC" on power on.
Initialize RTC period coefficients, etc. if RTC RAM doesn't contain valid
values. time.time() then will return number of seconds since power-on, unless
set to different timebase.
This reuses MEM_MAGIC for the purpose beyond its initial purpose (but the whole
modpybrtc.c need to be eventually reworked completely anyway).
diff --git a/esp8266/esp_mphal.c b/esp8266/esp_mphal.c
index f5e9468..1a46c5f 100644
--- a/esp8266/esp_mphal.c
+++ b/esp8266/esp_mphal.c
@@ -37,6 +37,7 @@
void mp_hal_init(void) {
ets_wdt_disable(); // it's a pain while developing
+ mp_hal_rtc_init();
uart_init(UART_BIT_RATE_115200, UART_BIT_RATE_115200);
}