Hardware Reference
In-Depth Information
As root, edit the
/lib/udev/rules.d/77-mm-usb-device-blacklist.rules
file, and add
these lines before the
LABEL="mm_usb_device_blacklist_end"
line at the bottom:
# Adafruit USB to TTL Serial Cable (PL2303HXA)
ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", ENV{ID_MM_DEVICE_IG
NORE}="1"
If you use a different USB serial cable from the Adafruit cable, and you're trying to fix
this problem, you should be able to run the
lsusb
application (from the
usbutils
pack-
age) to determine the
idVendor
and
idProduct
string (they will show up in the output
in the syntax
XXXX:YYYY
where
XXXX
is the
idVendor
and
YYYY
is the
idProduct
).
For example, the
lsusb
value for the Adafruit USB serial cable looks like this:
Bus 003 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
Port
Udev
automatically detects changes to rules files, so changes take effect immediately
without requiring udev to be restarted. That said, sometimes you need to reboot the
Linux system for
udev
to reread its rules. Either way, whenever
udev
reads in its new
rules, the USB serial converter device should now be blacklisted, and
ModemManager
should ignore it from then on out.
Add a Reset Button
HACK 17
Perhaps you've noticed your Pi lacks something pretty common among
electronics: a power switch. The Model B revision 2 boards come with a
small fix.
It's somewhere between vaguely uncomfortable and outright inconvenient to remove
the power supply from your computer as an on/off switch, but that's what you do on
the Raspberry Pi. One easy fix, regardless of what board you have, is to plug it into a
power strip with an on/off switch and use that. But with the Model B revision 2 boards,
you have another option.
