When using FASTLED_ESP8266_RAW_PIN_ORDER:
GPIO6, GPIO7, GPIO8, GPIO11 – never available (used to communicate with onboard flash, I believe)
GPIO1 – wdt resets, I suspect this is related to GPIO1 being used by the UART
GPIO9, GPIO10 – on the adafruit huzzah feather board I have, these pins also cause a wdt reset - https://github.com/esp8266/Arduino/issues/1446 seems to indicate that these two pins can’t be used.
So - I’m going to block out/remove the pin definitions for GPIO6-11 - it’s tempting to also remove GPIO1 from consideration (otherwise, folks who try to use serial will get WDT resets and not know why).
(I’m also going to work on validating the pin mappings for a handful of popular boards and make sure the maps get selected automatically - but once I do this, FastLED is going to require arduino esp8266 v2.2.0 or later)