Missing memory configurations for existing board causes "Unknown Board" message about makeesparduino HOT 4 CLOSED

Yes, saw that one. Fix is in the making

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Please try the latest commit

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If I wipe out all of the FlashSize options for the board, no unknown board message shows, but I do get this error after linking:
/usr/share/arduino_esp8266/tools/xtensa-lx106-elf/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld: cannot open linker script file -Wl,--gc-sections: No such file or directory collect2: error: ld returned 1 exit status make: *** [/usr/share/arduino_esp8266/makeEspArduino.mk:244: /tmp/mkESP/main_thing/main.bin] Error 1

Is there a scenario where I should be able to build with no FlashSize selected? I won't pretend to know what is needed or not from that boards file.

All in all, much better! If FLASH_DEF is required to have content for success, it may be nice to fail fast with a message requiring it.

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Good point.
FLASH_DEF controls both the memory configuration parameters and which link-file to use.
Please note that you can supply it on the command line (or in a separate config file) via FLASH_DEF=

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