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When switching to Big Sur, somehow the ESP8266 tools for the Arduino IDE broke ... and one cannot upload compiled sketches any more.
An example of this error:
pyserial or esptool directories not found next to this upload.py tool. An error occurred while uploading the sketch
This affects at least ESP8266 Core version 2.7.4 and 2.7.2 (I'm running Arduino IDE version: 1.8.13 right now).
The fix:
~/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/tools/pyserial/serial/tools/list_ports_osx.py
iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')
The code should look something like this, save it and try again ... this fixed it on my Mac:
from serial.tools import list_ports_common
#iokit = ctypes.cdll.LoadLibrary(ctypes.util.find_library('IOKit'))
#cf = ctypes.cdll.LoadLibrary(ctypes.util.find_library('CoreFoundation'))
iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')
kIOMasterPortDefault = ctypes.c_void_p.in_dll(iokit, "kIOMasterPortDefault")
kCFAllocatorDefault = ctypes.c_void_p.in_dll(cf, "kCFAllocatorDefault")
