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Added note on MSDDisable

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This commit is contained in:
Kevin Townsend 2018-02-15 15:51:10 +01:00
parent f989db25b5
commit 70596b6641
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ports/nrf/boards/feather52840/README.md
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@ -105,6 +105,34 @@ Run.
From this point onward, you can now use a simple serial port for firmware
updates.
### IMPORTANT: Disable Mass Storage on PCA10056 J-Link
The J-Link firmware on the PCA10056 implement USB Mass Storage, but this
causes a known conflict with reliable USB CDC serial port communication. In
order to use the serial bootloader, **you must disable MSD support on the
Segger J-Link**!
To disable mass storage support, run the `JLinkExe` (or equivalent) command,
and send `MSDDisable`. (You can re-enable MSD support via `MSDEnable`):
```
$ JLinkExe
SEGGER J-Link Commander V6.20f (Compiled Oct 13 2017 17:20:01)
DLL version V6.20f, compiled Oct 13 2017 17:19:52
Connecting to J-Link via USB...O.K.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 24 2017 17:30:12
Hardware version: V1.00
S/N: 683947110
VTref = 3.300V
Type "connect" to establish a target connection, '?' for help
J-Link>MSDDisable
Probe configured successfully.
J-Link>exit
```
## Building and Flashing CircuitPython
### Installing `nrfutil`