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@@ -30,9 +30,16 @@ $ make BOARD=feather_nrf52840_express all
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## Flash
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-TODO: write more on flashing
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+`flash` target will use the on-board debugger (jlink/cmsisdap/stlink/dfu) to flash the binary. We should install those debugger/programmer software in advance. Futhermore, since external jlink can be used with most of the board, there is also `flash-jlink` target for out convenience.
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```
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$ make BOARD=feather_nrf52840_express flash
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+$ make BOARD=feather_nrf52840_express flash-jlink
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+```
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+
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+Some board use uf2 bootloader for drag & drop in to mass storage device, uf2 can be generated with `uf2` target
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+
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+```
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+$ make BOARD=feather_nrf52840_express all uf2
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```
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hathach