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Update udev rules #572

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Jun 13, 2024
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Update udev rules #572

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17 changes: 13 additions & 4 deletions microbit/src/03-setup/linux.md
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Original file line number Diff line number Diff line change
Expand Up @@ -60,21 +60,30 @@ These rules let you use USB devices like the micro:bit without root privilege, i
Create this file in `/etc/udev/rules.d` with the content shown below.

``` console
$ cat /etc/udev/rules.d/99-microbit.rules
$ cat /etc/udev/rules.d/69-microbit.rules
```

``` text
# CMSIS-DAP for microbit
SUBSYSTEM=="usb", ATTR{idVendor}=="0d28", ATTR{idProduct}=="0204", MODE:="666"

ACTION!="add|change", GOTO="microbit_rules_end"

SUBSYSTEM=="usb", ATTR{idVendor}=="0d28", ATTR{idProduct}=="0204", TAG+="uaccess"

LABEL="microbit_rules_end"
```

Then reload the udev rules with:

``` console
$ sudo udevadm control --reload-rules
$ sudo udevadm control --reload
```

If you had any board plugged to your computer, unplug them and then plug them in again.
If you had any board plugged to your computer, unplug them and then plug them in again, or run the following command.

``` console
$ sudo udevadm trigger
```

Now, go to the [next section].

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24 changes: 20 additions & 4 deletions microbit/src/03-setup/verify.md
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Expand Up @@ -18,20 +18,36 @@ $ # ^^^ ^^^
```

In my case, the micro:bit got connected to the bus #1 and got enumerated as the device #65. This means the
file `/dev/bus/usb/001/065` *is* the micro:bit. Let's check its permissions:
file `/dev/bus/usb/001/065` *is* the micro:bit. Let's check the file permissions:

``` console
$ ls -l /dev/bus/usb/001/065
crw-rw-rw-. 1 root root 189, 64 Sep 5 14:27 /dev/bus/usb/001/065
crw-rw-r--+ 1 nobody nobody 189, 64 Sep 5 14:27 /dev/bus/usb/001/065
```

The permissions should be `crw-rw-rw-`. If it's not ... then check your [udev
The permissions should be `crw-rw-r--+`, note the `+` at the end, then see your access rights by running the following command.

``` console
$ getfacl /dev/bus/usb/001/065
getfacl: Removing leadin '/' from absolute path names
# file: dev/bus/usb/001/065
# owner: nobody
# group: nobody
user::rw-
user:<YOUR-USER-NAME>:rw-
group::rw-
mask::rw-
other::r-
```

You should see your username in the list above with the `rw-` permissions, if not ... then check your [udev
rules] and try re-loading them with:

[udev rules]: linux.md#udev-rules

``` console
$ sudo udevadm control --reload-rules
$ sudo udevadm control --reload
$ sudo udevadm trigger
```

# All
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