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    [[rock3 | ROCK 3]] > [[rock3/Debian | Debian]]

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== Work with ROCK 3 Debian ==
=== Introduction to ROCK 3 Debian ===
[[File:ROCKPI4-Debian-desktop.png | 800px ]]

ROCK 3 Debian  is an easy to use desktop system. While working with ROCK 3 Debian, you will find it do well on playing music, Internet, Bluetooth, AI and so on.

ROCK 3 Debian uses '''systemd''' to manage system.

Command prepended by $ means the command may be executed by an unprivileged user.  And command prepended by # means the command may be executed by an privileged user. But the symbol, $ or #, is not part of the command.
=== Use System Tool Terminal ===

There are three kinds of tools for Terminal. They are LXTerminal, ""UXTerm"" and ""XTerm"". You are encouraged to choose your favorite one.
Click on the icon, flying bird, on the bottom left in the ROCK3 Debian's main window, and click on the icon, System Tools to select your wanted Terminal tool. Here is the LXTerminal as an example.
If you try to experience more excitement, just as we want you to do that, you can type the following command to be a super user.
  $ sudo su

[[File:terminal-LXTerminal.png | 800px ]]
=== Access from the Host PC/Laptop ===

==== Option 1: Serial console ====

Check [[rock3/dev/serial-console | Serial Console]]
==== Option 2: SSH ====
SSH server  is enabled on port 22 of ROCK 3 default image. 

Please use [https://angryip.org/ angryip] or use this command '''"ifconfig"''' by serial console to find your board IP address.

  $ ping ip-of-device
  $ ssh linaro@ip-of-device
=== Debian Default User Account ===

Non-root User:

  User Name : linaro
  Password  : linaro

===Desktop ===

The preinstalled Desktop is xfce4.
=== Install and update  necessary packages ===

Add Radxa APT, see [[rock3/radxa-apt | Radxa APT]].

Install packages;

  $ sudo apt-get update
  $ sudo apt-get install -y rockchip-overlay
  $ sudo apt-get install -y linux-4.4-rock-3-latest

=== Network Connection ===

There are two methods for network connection. One is Ethernet and the other is WIFI.
==== Ethernet Connection ====
You can use a network cable (one end connected to the external network port or route)  to connect your ROCK 3 to the network. The ROCK 3 will automatically configure the network for your surfing on the Internet.

===== To test the Ethernet, we need to follow the steps: =====

* Check whether the Ethernet is normal by command, '''ifconfig''', which would show us a network card, eth0, and the Ethernet IP address. Also, use tool, ping, to connect to a normal domain. 

  $ ifconfig
  $ ping www.baidu.com

* If failed to connect to a normal domain. , try 

  $ sudo dhclient eth0

==== WIFI Connection ====
When there is not a network cable for your ROCK Pi N10 the WIFI connection is another good choice. ROCK Pi N10 supports 2.4G/5G WIFI wireless network.


=== Check the DDR Menory ===
Rock3a  has several different DDR memory sizes, such as 2G, 4G, 8G.
 $ free -h
               total        used        free      shared  buff/cache   available
 Mem:          '''7.4Gi'''        72Mi       7.1Gi        16Mi       182Mi       7.2Gi 
 Swap:            0B          0B          0B
For example, the DDR memory on this board is 8G.
=== Storage device ===

* eMMC: /dev/mmcblk0
* uSD Card: /dev/mmcblk1
* NVME M.2 SDD:  /dev/nvme0n1

=== Test RTC Device ===
First, plug in RTC battery and power on.Check the rtc device:
 root@linaro-alip:~# dmesg | grep rtc
 [    0.328780] [drm] Cannot find any crtc or sizes
 [    0.328964] [drm] Cannot find any crtc or sizes
 [    0.749597] rk808-rtc rk808-rtc: registered as rtc0
 [    0.751404] rk808-rtc rk808-rtc: setting system clock to 2017-08-04 09:00:02 UTC (1501837202)

Second, use the follow commands to set the system time and synchronization to the rtc clock.
 $ date -s "2021-08-17 20:03:00"
 $ hwclock -w
 $ hwclock -r
 root@linaro-alip:~# hwclock -r
 2021-08-17 20:00:04.745124+00:00
 $ poweroff
and then disconnect the power supply
Third, back to power after 10 mins and check whether the rtc clock run the same time
 $ hwclock -r
 root@linaro-alip:~# hwclock -r
 2021-08-17 20:10:14.745124+00:00

=== Test Audio Player===
Download a wav audio file, and use the command to test.
 $ aplay -D plughw:1,0 xxx.wav
 
 root@linaro-alip:~# aplay -D plughw:1,0 6.wav 
 xcb_connection_has_error() returned true 
 Playing WAVE '6.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
=== Test USB Host ===
Plug in the U dish and use the command by serial console.
 $ '''dmesg | tail'''
 [  133.773558] usb 2-1: SerialNumber: CCYYB18M1CFKO4H4
 [  133.774332] usb-storage 2-1:1.0: USB Mass Storage device detected
 [  133.774657] scsi host0: usb-storage 2-1:1.0
 [  134.841096] scsi 0:0:0:0: Direct-Access     aigo     U350             1100 PQ: 0 ANSI: 6
 [  134.846394] sd 0:0:0:0: [sda] 30720000 512-byte logical blocks: (15.7 GB/14.6 GiB)
 [  134.847554] sd 0:0:0:0: [sda] Write Protect is off
 [  134.847635] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
 [  134.848824] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 '''[  134.858173]  sda: sda1'''
 [  134.861161] sd 0:0:0:0: [sda] Attached SCSI removable disk

 $ '''sudo mount /dev/sda1 /mnt'''
 $ '''lsblk'''
 root@linaro-alip:~# lsblk
 NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
 sda            8:0    1 14.7G  0 disk 
 └─sda1         8:1    1 14.7G  0 part /mnt
If  /dev/sda1 is successfully mounted, this usb host is working properly.