@yasokada
I have checked old SDKs.
SDK v0.9.2 (20 Oct 2017): no "-o" option for bossac. SDK v0.9.1 (20 May 2017): no "-o" option for bossac. The "-o" for bossac.py is added on 9 Jul 2018 https://github.com/zephyrproject-rtos/zephyr/commit/bde3224c911176a6af4fa60a067c7492dfc76fe4 I just wonder which environment they did check. It may be possible to replace bossac binary with "-o" option, but I am not sure whether it is best way for Zephyr. I will just check further information myself, but for a while, I give up using Adafruit Trinket M0 and will use other boards.
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