1.21. Appendix: System Setup¶
1.21.1. Serial Console Access¶
As most current development machines don’t have serial ports, the usual setup
is to use a USB-Serial-Converter. Some evaluation boards have such a converter
on board. After connecting, these usually show up on your host as
/dev/ttyUSB# or /dev/ttyACM# (check dmesg to find out).
On Debian systems, the device node will be accessible to the dialout group,
so adding your user to that group (adduser <user> dialout) removes the need
for root privileges.
1.21.1.1. Using the “screen” program¶
The terminal manager screen can also be used as a simple terminal emulator:
screen /dev/ttyUSB0 115200
To exit from screen, press <CTRL-A> <K> <y>.
1.21.1.2. Using the “microcom” program¶
A good alternative terminal program is microcom. On Debian it can be installed
with apt-get install microcom, on other distributions it can be installed
from source:
https://git.pengutronix.de/cgit/tools/microcom
Usage is simple:
microcom -p /dev/ttyUSB0
1.21.2. Network Access¶
Having network connectivity between your host and your target will save you a lot of time otherwise spent on writing SD cards or using JTAG. The main protocols used with barebox are DHCP, TFTP and NFS.
1.21.2.1. Configuration of dnsmasq for DHCP and TFTP¶
The dnsmasq program can be configured as a DHCP and TFTP server in addition
to its original DNS functionality:
sudo ip addr add 192.168.23.1/24 dev <interface>
sudo ip link set <interface> up
sudo /usr/sbin/dnsmasq --interface=<interface> --no-daemon --log-queries \
--enable-tftp --tftp-root=<absolute-path-to-your-images>/ \
--dhcp-range=192.168.23.240,192.168.23.250
