Dear Marti and William
Thank you for your reply. I tried using "--bossac-port", but still have problem about "-o" option. I checked my bossac option by ``` $ ~/Zephyr_191116/zephyr-sdk-0.10.3/sysroots/x86_64-pokysdk-linux/usr/bin/bossac --help ``` ``` Usage: bossac [OPTION...] [FILE]
Basic Open Source SAM-BA Application (BOSSA) Version 1.7.0
Flash programmer for Atmel SAM devices.
... ```
There is no "-o" option for my bossac. My environment is Ubuntu 18.04 LTS. I have found this. Adafruit Trinket M0 Bossac Offset is Wrong #16052 https://github.com/zephyrproject-rtos/zephyr/issues/16052 For Adafruit Trinket M0, the address is specified using "-o 0x2000". However, because my bossac does not have "-o" option, the problem occurs. It seems that I have to update my environment to have newer? bossac version.
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