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TODO

[3585232.736302] usb 1-1.3: new full-speed USB device number 109 using dwc_otg
[3585232.878743] usb 1-1.3: New USB device found, idVendor=2886, idProduct=802f, bcdDevice= 1.00
[3585232.878764] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3585232.878780] usb 1-1.3: Product: Seeed femto M0
[3585232.878795] usb 1-1.3: Manufacturer: Seeed
[3585232.878811] usb 1-1.3: SerialNumber: 1D5A0BE850553133352E3120FF0A183C
[3585232.881320] cdc_acm 1-1.3:1.0: ttyACM1: USB ACM device

Needs new version of BOSSA

$ sudo stty -F/dev/ttyACM1 1200

$ sudo /home/darron/.arduino15/packages/Seeeduino/tools/bossac/1.7.0-arduino3/bossac --port=ttyACM1 -U true -i
Atmel SMART device 0x10010005 found
Device       : ATSAMD21G18A
Chip ID      : 10010005
Version      : v1.1 [Arduino:XYZ] Nov 27 2019 16:35:59
Address      : 8192
Pages        : 3968
Page Size    : 64 bytes
Total Size   : 248KB
Planes       : 1
Lock Regions : 16
Locked       : none
Security     : false
Boot Flash   : true
BOD          : true
BOR          : true
Arduino      : FAST_CHIP_ERASE
Arduino      : FAST_MULTI_PAGE_WRITE
Arduino      : CAN_CHECKSUM_MEMORY_BUFFER

SAMD21G18

http://packs.download.atmel.com/

https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html

https://wiki.seeedstudio.com/Seeeduino-XIAO/

arduino

File → Preferences → Additional Boards Manager URLs

https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Tools→ Board → Boards Manager → Filter your search

Seeeduino XIAO