Basic knowledge:

• CORE9G25-CON
  • Getting started with CORE9G25-CON Board
• Using the SSH session
• Debug Serial Port Interface

How-tos:

• Configure the MAC address
• Set eth0 with a static IP address or DHCP when booting the system s

  Edit the /etc/network/interfaces file with the follow word, then you can boot the board with the ethernet preset. Set the eth0 for DHCP when booting auto eth0 iface eth0 inet dhcp Set the eth0 for Static IP address when booting auto eth0 iface eth0 inet static address 192.168.1.142 network 192.168.1.0 netmask 255.255.255.0 broadcast 192.168.1.255 gateway 192.168.1.1

• Get the IP address from DHCP manually

  If you need to get the IP address manually from the DHCP server on your LAN simply shut down the eth0 interface: ~# ifdown eth0 Internet Systems Consortium DHCP Client 4.1.1-P1 Copyright 2004-2010 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/eth0/00:04:25:a8:9d:5e Sending on LPF/eth0/00:04:25:a8:9d:5e Sending on Socket/fallback DHCPRELEASE on eth0 to 10.55.98.1 port 67 eth0: link down and bring it back up by typing: ~# ifup eth0 Internet Systems Consortium DHCP Client 4.1.1-P1 Copyright 2004-2010 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ ADDRCONF(NETDEV_UP): eth0: link is not ready Listening on LPF/eth0/00:04:25:a8:9d:5e Sending on LPF/eth0/00:04:25:a8:9d:5e Sending on Socket/fallback eth0: link up (100/Full) ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4 DHCPOFFER from 10.55.98.1 DHCPREQUEST on eth0 to 255.255.255.255 port 67 DHCPACK from 10.55.98.1 bound to 10.55.98.19 -- renewal in 33627 seconds. it comes up and grabs its IP (in this case 10.55.98.19 )

• Set the system date

  Your CORE9G25 board has two clocks: One called System Clock that is a software clock maintained by the Linux Operating System Another one called Real Time Clock (RTC) and implemented in hardware inside the Atmel CPU. This clock is powered by a Lithium battery to mantain the clock alive when the main power supply is off. Setting the System Clock date is the Linux command to manage the systems clock. To read the currently System Clock type: ~# date Fri Oct 8 17:44:42 CEST 2010 To set it type: ~# date -s 201311231517 Sat Nov 23 15:17:00 UTC 2013 This time is active until the main power supply board is on. When off the system clock is lost. Setting the Real Time Clock To read the Hardware Clock type: ~# hwclock -r Fri Oct 8 17:46:43 2010 -0.004115 seconds To set the Hardware Clock using the System Clock current time type: ~# hwclock -w Now check it typing: ~# date Fri Oct 8 18:49:02 CEST 2010 ~# hwclock -r Fri Oct 8 18:49:10 2010 -0.004076 seconds

• Change the hostname

  When you get access to the CORE9G25 board command line the prompt is something like this: CORE9G25:~# Where CORE9G25 is the current hostname. If more CORE9G25 boards or other Linux systems are reacheable on your LAN it could be important to have different hostnames tfor each board to avoid for example to give commands to the wrong system. The hostname is saved in /etc/hostname. Change it for example with myboard by typing: ~# echo "myboard" > /etc/hostname

• Read the microSD serial number

  Enter the SD Card ~# cd /sys/class/mmc_host/mmc?/mmc?:* /sys/class/mmc_host/mmc0/mmc0:aaaa# cat serial 0x015c5340 A lot of other info are available: /sys/class/mmc_host/mmc0/mmc0:aaaa# ls -al total 0 drwxr-xr-x 4 root root 0 Jun 27 15:37 . drwxr-xr-x 4 root root 0 Jun 27 15:37 .. drwxr-xr-x 3 root root 0 Jun 27 15:37 block -r--r--r-- 1 root root 4096 Jun 28 07:18 cid -r--r--r-- 1 root root 4096 Jun 28 07:28 csd -r--r--r-- 1 root root 4096 Jun 28 07:28 date lrwxrwxrwx 1 root root 0 Jun 27 15:37 driver -> ../../../../../../bus/mmc/drk -r--r--r-- 1 root root 4096 Jun 28 07:28 erase_size -r--r--r-- 1 root root 4096 Jun 28 07:21 fwrev -r--r--r-- 1 root root 4096 Jun 28 07:21 hwrev -r--r--r-- 1 root root 4096 Jun 28 07:21 manfid -r--r--r-- 1 root root 4096 Jun 27 15:37 name -r--r--r-- 1 root root 4096 Jun 28 07:18 oemid drwxr-xr-x 2 root root 0 Jun 28 07:28 power -r--r--r-- 1 root root 4096 Jun 28 07:28 preferred_erase_size -r--r--r-- 1 root root 4096 Jun 28 07:28 scr -r--r--r-- 1 root root 4096 Jun 27 15:37 serial lrwxrwxrwx 1 root root 0 Jun 27 15:37 subsystem -> ../../../../../../bus/mmc -r--r--r-- 1 root root 4096 Jun 28 07:28 type -rw-r--r-- 1 root root 4096 Jun 27 15:37 uevent Related links RPi SD cards Bunnie:studios blog MicroSD card FAQ Samsung SD & MicroSD Card product family Samsung memory store

• System partition table

  0x00000-0x40000 : "bootstrap" 0x40000-0xc0000 : "uboot" 0xc0000-0x100000 : "env" 0x100000-0x140000 : "env_redundant" 0x140000-0x180000 : "spare" 0x180000-0x200000 : "dtb" 0x200000-0x800000 : "kernel" 0x800000-0x10000000 : "rootfs"

• Reserve

Programming languages

This is a selection of "Hello World !" examples in all the languages we tried on the CORE9G25 boards:

• Hello World in C

Linux Kernel 3.6.9 and Buildroot

• Bootloader: Compiling AT91Bootstrap for CORE9G25
• U-boot: Compiling U-boot for CORE9G25
• Linux Kernel image: Compiling the Linux Kernel 3.6.9 for the CORE9G25
• Rootfs: Build an Embedded Buildroot root filesystem

Update the system image file:

• Recovery the Pre-install System by SD card
• Update the system image by USB Disk
• System Image Repository

Embedded peripherals

• GPIO lines
• UART: RS232/RS422/RS485
• SPI bus interface
• I2C bus interface
• 1-wire lines
• A/D converter lines
• CORE9G25 wiring examples
• RTC实时时钟使用建议

USB peripherals

• Wi-Fi USB adapters
• USB to 4 serial port adapter module
• USB to Ethernet module

Programming examples

• Programming examples with c
• Install the ARM9 cross toolchain to compile the Linux Kernel and AT91Bootstrap
• Hello world example from a Linux Device driver