project:single_boards [Labka Hackerspace Ostrava]

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|**Project owner:**| [[user:overdrive|Overdrive]] |
|**Interested:** | peterbay, [[user:overdrive|Overdrive]]|
|**Related:**| |
|**Reference:**| https://en.wikipedia.org/wiki/Banana_Pi |
| **License:** | [[https://creativecommons.org/licenses/by-sa/3.0/|Uveďte původ-Zachovejte licenci; CC BY-SA]]  |
{{ project:picka_small.jpg?300}}
====== Howto for different single-boards ======

   * install Rabsbian on SD cards : http://elinux.org/RPi_Easy_SD_Card_Setup
   * Banana Linux Home Page: https://www.bananian.org/
   * howto connect to Picka and forward X server on Mac : https://www.youtube.com/watch?v=MXi-Tk1Wbpc
===== PI Specific tools =====
   * rpi-update - update firmware
   * rpi-config - system config
   
===== MacOSX install of Banana PI =====
   * Banana Pi: http://www.bananapi.org/p/product.html
<code>
SemioTex:pavouk$ mount | grep -i picka1
/dev/disk3s1 on /Volumes/PICKA1 (msdos, local, nodev, nosuid, noowners)

SemioTex: pavouk$ cd ~/Desktop/
SemioTex:Desktop pavouk$ ls -la *.img
-rw-r--r--  1 pavouk  staff  3932160000  5 srp  2015 Raspbian_For_BPI_M1_V4.0.img

SemioTex:Desktop pavouk$ sudo diskutil unmount /Volumes/PICKA1
Volume PICKA1 on disk3s1 unmounted

SemioTex:Desktop pavouk$ sudo dd bs=1m if=~/Desktop/Raspbian_For_BPI_M1_V4.0.img of=/dev/disk3 
  * u can check progress with CTRL+T [SIGINFO]
==== Configure Mac to be able to directly conenct to Picka over ETH through trunderbolt ====

  * connect thunderbolt and Picka by straight cable
  * system preferences on mac -> Network -> Thunderbolt: use DHCP
  * system preference on mac -> Sharing -> check ON Internet sharing
  * ifconfig: find bridge*

<code>
bridge100: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	options=3<RXCSUM,TXCSUM>
	ether 2a:37:37:c1:c0:64 
	inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255
	inet6 fe80::2837:37ff:fec1:c064%bridge100 prefixlen 64 scopeid 0xa 
	Configuration:
		id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
		maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
		root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
		ipfilter disabled flags 0x2
	member: en5 flags=3<LEARNING,DISCOVER>
	        ifmaxaddr 0 port 9 priority 0 path cost 0
	nd6 options=1<PERFORMNUD>
	media: autoselect
	status: active
</code>

   * use nmap to find where you have Picka [or you can try to find it as next to bridge ip]
   * Scan for every TCP and UDP open port:
<code>
sudo nmap -n -PN -sT -sU -p- remote_host
</code>

<code>
SemioTex:Picka pavouk$ nmap 192.168.2.*
### more extensive nmap: nmap -p0- -v -A -T4 192.168.1.*
Starting Nmap 6.47 ( http://nmap.org ) at 2016-03-13 14:47 CET
Nmap scan report for 192.168.2.2
Host is up (0.0017s latency).
Not shown: 999 closed ports
PORT   STATE SERVICE
22/tcp open  ssh
</code>

===== MacOSX Backup & restore Banana PI SD card =====
  * https://smittytone.wordpress.com/2013/09/06/back-up-a-raspberry-pi-sd-card-using-a-mac/

====== Backup ====== 

<code>
# to list partitions

diskutil list 

#/dev/disk4 (internal, physical):
#   #:                       TYPE NAME                    SIZE       IDENTIFIER
#   0:     FDisk_partition_scheme                        *7.9 GB     disk4
#   1:             Windows_FAT_32 boot                    58.7 MB    disk4s1
#   2:                      Linux                         7.9 GB     disk4s2
   
#in our case it was /dev/disk4
#CTRL+T as SIGINFO could be used to check progress

sudo dd if=/dev/disk4 bs=1m | gzip > ~/1_Labka/banana_picka_25.5.2016.img.gz
</code>
====== example how to copy backup by scp ======
======= copy to remote host ======= 

<code>scp ~/1_Labka/banana_picka_25.5.2016.img.gz user@remotehost:/home/share/Picky_Backup/</code>

======= copy to localhost ======= 
<code>scp your_username@remotehost:/home/share/Picky_Backup/banana_picka_25.5.2016.img.gz /some/local/directory</code>



====== Restore ======
   * **remember, SD card should be unmounted**
<code>
# first check where SD card is visible, but not mounted by
diskutil list 
# let it be again /dev/disk4
gzip -dc ~/1_Labka/banana_picka_25.5.2016.img.gz | sudo dd of=/dev/disk4 bs=1m
</code>



===== remove password to ssh =====
https://wiki.archlinux.org/index.php/Banana_Pi#Network
  * ssh root@IP
  * password is bananapi


   mkdir ~/.ssh
   chmod 700 ~/.ssh
   touch ~/.ssh/authorized_keys
   chmod 600 ~/.ssh/authorized_keys
   
==== example of generating key to non standard position ====

<code> 
over@darkstar>mkdir ~/ssh_tmp
ssh-keygen -t rsa -C "tpetru@gmail.com" -f ~/ssh_tmp/id_rsa_na_jine_misto
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/over/ssh_tmp/id_rsa_na_jine_misto
Your public key has been saved in /home/over/ssh_tmp/id_rsa_na_jine_misto.pub.
The key fingerprint is:
SHA256:hriECJShFg+8AKVHVkoqYtBknvhf/sGW+KQr4wqtEUE tpetru@gmail.com
The key's randomart image is:
+---[RSA 2048]----+
|=EX..            |
|*%=o             |
|@o*.             |
|** . . .         |
|o o o o S        |
| o o + + .       |
|o . o o *        |
| +  o  * .       |
|. .o.oo.o        |
+----[SHA256]-----+
</code>
   

   nano ~/.ssh/authorized_keys <--- copy there public key generated somewhere

this is what you should have:

drwx------  2 root root 4096 Mar 13 13:23 .ssh

-rw------- 1 root root  209 Mar 13 13:21 authorized_keys


   nano /etc/ssh/sshd_config -> PasswordAuthentication no
   sudo service ssh restart

test by:
   ssh root@localhost
if it is asking for key, everything is ok !!! do not disconnect from session before test from outside !!!
try from outside:
   ssh root@IP_of_pi
when able to connect by key, everything is fine

==== create ~/.ssh/config for labka ====
  touch ~/.ssh/config   
  chmod 110 ~/.ssh/config

* add there this block of code; user needs to be correctly set up:
<code>
Host labka
    user [SOME USER PICO]
    hostname 193.84.207.21
    ForwardX11 yes
</code>

* next time, you can connect to server by
   ssh labka
instead of 
   ssh [some_user]@193.84.207.21

==== add user to wheel group [grant him sudo] ====
   usermod -aG wheel username

===== Change colour of shell =====
   nano ~/.bashrc

edit to something like this 31m is red:
   * more here: http://bitmote.com/index.php?post/2012/11/19/Using-ANSI-Color-Codes-to-Colorize-Your-Bash-Prompt-on-Linux

   PS1='\[\e[1;31m\][\u@\h \W]\$\[\e[0m\] '
===== Resize SD card =====
   * http://elinux.org/RPi_Resize_Flash_Partitions
   
   raspi-config --expand-rootfs
   
===== Timezone =====
   tzselect  
   
===== Install basic tools =====
aptitude install lsof
   
===== Run Banana PI from SATA =====
   * http://www.htpcguides.com/move-linux-banana-pi-sata-setup/ 
====== SDR ======
   * https://learn.adafruit.com/freq-show-raspberry-pi-rtl-sdr-scanner/
===== Pulseaudio =====
   * https://raspberrypi.stackexchange.com/questions/639/how-to-get-pulseaudio-running
   * https://wiki.freedesktop.org/www/Software/PulseAudio/Documentation/User/PerfectSetup/
<code>   
sudo apt-get install pulseaudio pulseaudio-module-zeroconf alsa-utils avahi-daemon pulseaudio-module-zeroconf pulseaudio-utils
</code>     

The following is what I did just to get it working in per-session mode (not system mode). System mode may work as well, I haven't attempted it. Setting up server will require some more work. I found this information in various places, hopefully gathering it here will help someone.

Install pulseaudio and make sure user (e.g. <del>over</del>) is part of the audio group:

   sudo adduser over audio

Change **/etc/asound.conf** look like the following. This sets up pulseaudio to be used as an alsa device by default so applications use it without any additional configuration. The first two declarations (including the commented one) was in the original file.
<code>
pcm.mmap0 {
    type mmap_emul;
    slave {
      pcm "hw:0,0";
    }
}

pcm.pulse { type pulse }
ctl.pulse { type pulse }
pcm.!default { type pulse }
ctl.!default { type pulse }
</code>

Add the following lines to /**etc/pulse/daemon.conf**:
<code>
default-sample-rate = 48000
resample-method = trivial
</code>

OVERDRIVE'S CONFIG TO MAKE IT RUN

**sudo nano /etc/pulse/default.pa**

<code>
.nofail
.fail
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore
load-module module-augment-properties
load-module module-switch-on-port-available
load-module module-pipe-sink
.ifexists module-udev-detect.so
load-module module-udev-detect
.else
load-module module-detect
.endif
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix
.ifexists module-gconf.so
.nofail
load-module module-gconf
.fail
.endif

load-module module-default-device-restore
load-module module-rescue-streams
load-module module-always-sink
load-module module-intended-roles
load-module module-suspend-on-idle

.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif

load-module module-position-event-sounds
load-module module-role-cork
load-module module-filter-heuristics
load-module module-filter-apply

.ifexists module-x11-publish.so
.nofail
load-module module-x11-publish
.fail
.endif

set-default-sink output
set-default-source input
</code>


To start the pulseaudio server, use:
   pulseaudio -k; pulseaudio -D

You might be also be able to set up in system-wide mode with:

  sudo pulseaudio --system 
  
To debug, run:

   pulseaudio --log-level=debug

To test alsa, run:
  
   amixer -Dpulse