From e80656bfa9391d6ce7cedddeb1adbb321885a443 Mon Sep 17 00:00:00 2001 From: martin-ger Date: Tue, 13 Feb 2018 11:27:51 +0100 Subject: [PATCH] Update README.md --- README.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index 833e4c8..2ef2e93 100644 --- a/README.md +++ b/README.md @@ -204,7 +204,8 @@ On Windows you can flash it using the "ESP8266 Download Tool" available at https -If "QIO" mode fails on your device, try "DIO" instead. Also have a look at the "Detected Info" to check size and mode of the flash chip. If your downloaded firmware still doesn't start properly, please check with the enclosed checksums whether the binary files are possibly corrupted. +## Known Issues +If "QIO" mode fails on your device, try "DIO" instead. Also have a look at the "Detected Info" to check size and mode of the flash chip. Sometimes there is a wrong or non-matching version of "esp_init_data_default.bin" in the flash. If the firmware files from above flash correctly but after reboot you see only garbage on the serial and/or the LED on GPIO2 is flashing rapidly, try to re-initialize this sector: download https://github.com/espressif/ESP8266_NONOS_SDK/blob/master/bin/esp_init_data_default_v08.bin and flash it to 0x7c000 for 512 kB modules (some ESP-01, Sonoff Switch), 0xfc000 for 1 MB modules (most ESP-01), or 0x3fc000 for 4 MB modules (most ESP-12, Wemos D1). If your downloaded firmware still doesn't start properly, please check with the enclosed checksums whether the binary files are possibly corrupted. # The MQTT broker library The library code has been moved to a separate repository at https://github.com/martin-ger/uMQTTBroker and is included recursivly.