Preparation and installation of OpenWrt on the router jjPlus JA76PF02
Installing from console with serial connection
You should:
- Shut down the board
- Connect the Ethernet cable to the router’s (WAN port) and the other end to your computer
- Set the address of the network card on your computer to 192.168.1.1
- Run a TFTPD server and put in its root the files openwrt-ar71xx-generic-ja76pf2-kernel.bin and openwrt-ar71xx-generic-ja76pf2-rootfs-squashfs.bin
- Start the tftpd server
- Connect the serial cable to the board
- Start a serial terminal with parameters 8 n 1 115200
- Turn on the board
- and hit Ctrl-C to stop at the bootloader’s command line. Now you are in RedBoot
Simply run the following commands:
fis init
load -r -b 0x80060000 openwrt-ar71xx-generic-ja76pf2-kernel.bin
fis create linux
load -r -b %{FREEMEMLO} openwrt-ar71xx-generic-ja76pf2-rootfs-squashfs.bin
fis create rootfs
fis load -l linux
exec -c "board=JA76PF2" You should also remember to check the startup script (command fconfig-l bootloader) it should be as follows:
fis load -l linux
exec -c "board=JA76PF2" NOTE: The default IP address of the plate in the boot loader is 192.168.1.2. After installing OpenWrt address is normally set to 192.168.1.1
Setting up RedBoot Startup Script
If this is the first time you are setting up this board then you need to do the following
RedBoot> fconfig -l Run script at boot: true Boot script: .. fis load -d vmlinux .. exec
Boot script timeout (1000ms resolution): 3 Use BOOTP for network configuration: false Gateway IP address: 0.0.0.0 Local IP address: 192.168.1.2 Local IP address mask: 255.255.255.0 Default server IP address: 192.168.1.1 Console baud rate: 115200 GDB connection port: 9000 Force console for special debug messages: false Network debug at boot time: false Default network device: ag7100_eth1
RedBoot> fconfig Run script at boot: true Boot script: .. fis load -d vmlinux .. exec Enter script, terminate with empty line >> fis load -l linux >> exec -c "board=JA76PF2" >> Boot script timeout (1000ms resolution): 10 Use BOOTP for network configuration: false Gateway IP address: Local IP address: 192.168.1.2 Local IP address mask: 255.255.255.0 Default server IP address: 192.168.1.1 Console baud rate: 115200 GDB connection port: 9000 Force console for special debug messages: false Network debug at boot time: false Default network device: ag7100_eth1 Update RedBoot non-volatile configuration - continue (y/n)? y ... Erase from 0xbffe0000-0xbfff0000: . ... Program from 0x80ff0000-0x81000000 at 0xbffe0000: .
Installation by sysupgrade
Just as in normal OpenWrt sysupgrade upload a file to the router and issue the command sysupgrade-n image_name.
The temperature sensor
Please install i2c-tools package, kmod-i2c-core as well as their dependencies.
After this you will be able to read the temperature:
root@OpenWrt:/# i2cdetect -l
i2c-0 i2c i2c-gpio0 I2C adapter
root@OpenWrt:/# i2cdetect i2c-gpio0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n] y
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@OpenWrt:/# i2cget i2c-gpio0 0x48 0xaa w
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, data address
0xaa, using read word data.
Continue? [Y/n]
0x0133
root@OpenWrt:/# and decode the resulting value.
You can also install kmod-hwmon-LM75 and LM75. Load the module with the parameter force = 0,0 x48. Temperature reading:
# echo lm75 0x48 > /sys/devices/platform/i2c-gpio.0/i2c-0/new_device
# cat /sys/devices/platform/i2c-gpio.0/i2c-0/0-0048/temp1_input