bbb-preempt-rt-kernel-patch's Introduction

BBB PREEMPT RT patch script

This script will install a Debian image at your SD card with the Linux preempt rt kernel

Requirements

There are a couple of dependencies needed for the script to run successfully. On Debian/Ubuntu, be sure to have build-essential, quilt, gcc-arm-linux-gnueabihf or cross-binutils installed.

How it works?

You only have to run sudo ./bbb-patch.sh start /dev/sdb changing /dev/sdb with the desired device

Workflow

The bbb-patch script will:

Download linux kernel 3.12 and debian image (requeriments.sh)
Apply OSADL patches (enabling PREEMPT RT) at Linux Source (osadl-patch.sh)
Compile Linux Kernel (compile-kernel.sh)
Copy Debian 7.5 image to your SD card (clone-image.sh)
Copy the patched kernel to your SD card (transfer.sh)

Available commands on bbb-patch.sh

help: show the help window
start $2: start the process (pass the /dev/* as second argument!)
clean: clean 'start' generated folders
clean-all: clean 'start' generated files, including downloaded

TransferToSD-only process

If you already downloaded the Debian Image and have compiled the kernel, probably because you already ran the build-patch-deploy, you just need to run ./transfer.sh /dev/sdb, changing /dev/sdb with the desired device.

Re-download patches

If you want to re-download the OSADL patches you can run ./osadl-downloads.sh.

Problems with connection sharing

If you are sharing the connection with BBB using the USB port, and it is not working, try to run this on BBB:

/sbin/route add default gw 192.168.7.1;
echo "nameserver 8.8.8.8" >> /etc/resolv.conf;

And this on your Ubuntu (or Debian based) host:

sudo iptables -A POSTROUTING -t nat -j MASQUERADE;
sudo echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward > /dev/null;

If you don't want to re-run both scripts after reboot, add it to ~/.bashrc

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bbb-preempt-rt-kernel-patch's Issues

It's not really real-time?

Hi Brnluiz,
Thanks for your information for this git source. It's really helpful to me.
But I met a problem. I already finished all 5 steps (5 scripts) and boot my beaglebone black from sdcard.
All was fine, but X Window met some problem. (Sometimes some error as below note. I could switch to command line mode, that's ok.)

The 'uname -a' shows version is "Linux beaglebone 3.12.31-rt45 #1 SMP PREEMPT RT Tue Jun 2......armv71 GNU/Linux". When I test its efficacy by "rt-tests" tool, it looks like non-realtime OS:

sudo cyclictest -p 90 - m -c 0 -i 200 -n -h 100 -q -l 1000000
Min Latencies: 000006
Avg Latencies: 116772
Max Latencies: 821199

Do I made any mistake? Do you have any suggestion?
Thank you~

Note:
About X Window error message. There are only these message in my monitor.
[ 37.313103] libphy: PHY4a101000.mdio:01 not found
[ 37.320514] net eth0: phy 4a101000.mdio:01 not found on slave 1
[ 43.000255] libphy: PHY4a101000.mdio:01 not found
[ 43.006086] net eth0: phy 4a101000.mdio:01 not found on slave 1
[ 43.611974] libphy: PHY4a101000.mdio:01 not found
[ 43.617879] net eth0: phy 4a101000.mdio:01 not found on slave 1

Regards,

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