oak8x - oak - thunder

A fully open source Asterisk FXO/S module which supports up to 8 channels and based on Raspberry Pi

OAK8X Manual

Compile the new Kernel dtbs files to support tdm bus

Follow this link to download Raspberry Pi Kernel https://www.raspberrypi.org/documentation/linux/kernel/building.md

cd ~/linux/arch/arm/boot/dts
vim bcm283x.dtsi

Go to the section for DMA and follow below to remove interrupts 25, 26 and DMA 9, 10.

                dma: dma@7e007000 {
                        compatible = "brcm,bcm2835-dma";
                        reg = <0x7e007000 0xf00>;
                        interrupts = <1 16>,
                                     <1 17>,
                                     <1 18>,
                                     <1 19>,
                                     <1 20>,
                                     <1 21>,
                                     <1 22>,
                                     <1 23>,
                                     <1 24>,
                                     <1 25>, //remove
                                     <1 26>, //remove
                                     /* dma channel 11-14 share one irq */
                      
			  interrupt-names = "dma0",
                                          "dma1",
                                          "dma2",
                                          "dma3",
                                          "dma4",
                                          "dma5",
                                          "dma6",
                                          "dma7",
                                          "dma8",
                                          "dma9”,  //remove
                                          "dma10”, //remove
                                          "dma11",
                                          "dma12",
                                          "dma13",

Then add below tdm bus definition after the i2s section:

                i2s: i2s@7e203000 {
                        compatible = "brcm,bcm2835-i2s";
                        reg = <0x7e203000 0x24>;
                        clocks = <&clocks BCM2835_CLOCK_PCM>;

                        dmas = <&dma 2>,
                               <&dma 3>;
                        dma-names = "tx", "rx";
                        status = "disabled";
                };

                // new section to add for oak8x:
                tdm: tdm@7e203000 {
                        compatible = "brcm,pi-tdm";
                        reg = <0x7e203000 0x20>,
                              <0x7e101098 0x02>;

                        dmas = <&dma 2>,
                               <&dma 3>;
                        dma-names = "tx", "rx";
                        interrupts = <1 25>, <1 26>;
                        interrupt-names = "dma9", "dma10";
                        status = "okay";
                };

cd ~/linux
make dtbs

when done

cp arch/arm/boot/dts/*.dtb /boot

Then copy the new dtb files to the RaspberryPi /boot folder, make sure you have a backup before you overwrite them.

Disable the spi and i2s bus in /boot/config.txt file like below shows

dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

Compile the dahdi

Get the source code from https://github.com/antonatosn/switchpi-thunder-oak.git

cd /usr/src/dahdi-linux
make KSRC=~/linux
make KSRC=~/linux install

Compile the dahdi-tools

Recompile the Asterisk to add dahdi supports

install required packages

apt install libncurses5-dev uuid-dev libjansson-dev libxml2-dev libsqlite3-dev openssl libssl-dev build-essential

Download the asterisk-13.20.0 and recompile it, remember to check up the chan-dahdi

Find the dahdi modules in /lib/modules and make symlink if the modules are not place in the current kernel. (eg. modules are placed in kernel version 4.14.71-v7+ but you are using 4.14.50-v7+)

Run depmod -a to refresh modprobe list

depmod -a

Configuring dahdi

edit /etc/init.d/dahdi

load_modules() {
        # Some systems, e.g. Debian Lenny, add here -b, which will break
        # loading of modules blacklisted in modprobe.d/*
        unset MODPROBE_OPTIONS
        modules=`sed -e 's/#.*$//' $DAHDI_MODULES_FILE 2>/dev/null`
        #if [ "$modules" = '' ]; then
                # what?
        #fi
        echo "Loading DAHDI hardware modules:"
		// add the bellow
        modprobe -r pidma
        modprobe dahdi
        modprobe pidma

The detailed manual

Please check out the detailed manual in https://switchpi.com/2018/08/29/manual-of-install-oak8x-module/