I was messing around with adblock on my OpenWRT router. While trying to get it to work I got the following error:
sha256sum: not found

After a bit of digging around, I found that the sha256sum binary is in the coreutils-sha256sum package.
So installing on OpenWRT over SSH goes like this:
opkg install coreutils-sha256sum

BIOS - ChipI tried to do a BIOS update from Windows. Flashing finished without an error so I decided to reboot. The tablet shut down and… never turned on again. Nothing of what I tried had any effect, the tablet remained dead. Not A sign of life. So I decided the BIOS flash must have gone wrong. What now?

After some research I found that there were more people with the same problem, and some seemed to have successfully flashed their BIOS again. So I decided to give it a try.

First of all I needed some hardware. I searched online for a BIOS programmer, and found a cheap CH314A programmer that should do the job. It had TTL and 3.3V levels, I knew that the BIOS chip was 3.3V so it should work without frying my BIOS chip.

Next step was to find a way to program the chip without soldering. I knew that the chip was in SOP8 package, so I searched a test adapter for a SOP8 chip, and ordered one.

After about a week the hardware was in, and I could get to work. I found the correct BIOS and found a bin file in the download. Then I installed flashrom and connected all the hardware together.
BIOS - Tablet and laptop BIOS - Adapter

First I made a backup of the current rom using flashrom:
flashrom -p ch341a_spi --read backup.bin

After the backup it was time to flash:
Screenshot from flashrom

After this, I disconnected the test adapter, disconnected the battery, reconnected the battery and tried to boot. And with success, the tablet booted straight up to Windows!

I upgraded my Raspberry Pi to a newer kernel and updated the firmware with the following commands:

sudo apt-get update && sudo apt-get upgrade
sudo rpi-update
sudo reboot

After this my pilight couldn’t send anymore using the lirc_rpi module. Al lot of resources mentioned a new device tree and stuff, so I added the following to my /boot/config.txt file:

# Uncomment this to enable the lirc-rpi module

This caused the lirc_rpi module to be loaded and I could receive data using the pilight-raw command. But sending still wouldn’t work.

After lots of time and effort I found the culprit. The new module seems to have enable softcarrier by default. Also autosensing didn’t work always as intended. So I changed the lines in my /boot/config.txt to the following:

# Uncomment this to enable the lirc-rpi module

Now everything works as expected!

Please let me know if this helped you to solve your problem.

iodineI’ve had some troubles getting Iodine-server to work under CentOS 7. So iv’e decided to write an article how I’ve managed to get it to work.

This instruction is based on a setup using iptables instead of firewalld, because I run iptables on all my servers since forever.

DNS setup

For iodine to work there are two records required. An A-record and an NS record. I’ve used the same naming as the iodine documentation, to keep it as simple as possible.
First add an A-record with the name t1ns that points to the ip of your server that will run the iodine server. The ip used here for the example should be replaced by your ip.
A: t1ns.<<yourdomain>> → 374.263.291.194

Then add an NS record with the name t1 that points to the A-record you’ve just made;
NS: t1.<<youdomain>> → t1ns.<<yourdomain>>

That’s all there is required for iodine to work with your domain.

Installing iodine

Firstly, make sure the EPEL repository is installed:
yum -y install epel-release

Then install iodine-server:
yum -y install iodine-server

Next is configuring iodine by editing /etc/sysconfig/iodine-server.
Make sure the line that starts with OPTIONS look something like this:
OPTIONS="-f -c -P <<yourpassword>> t1.<<yourdomain>>"
Replace <<yourpassword>> with the password you wish to use, and <<yourdomain>> with the domain you are using for iodine.

Then, start iodine-server and enable it at boot:
systemctl start iodine-server
systemctl enable iodine-server

Configure traffic routing

Allow DNS and NAT traffic trough iptables:
iptables -t nat -A POSTROUTING -s -o eth0 -j MASQUERADE
iptables -t filter -A INPUT -p udp -m multiport --dports 53 -j ACCEPT
iptables -t filter -A INPUT -i dns0 -j ACCEPT
iptables -t filter -A OUTPUT -o dns0 -j ACCEPT
iptables -t -A OUTPUT -p udp -m multiport --dports 53 -j ACCEPT
iptables -t filter -A FORWARD -i dns0 -o eth0 -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -A FORWARD -i eth0 -o dns0 -m state --state RELATED,ESTABLISHED -j ACCEPT

And save the new ruleset:
iptables-save > /etc/sysconfig/iptables

Next, allow ipv4 packet forwarding and restart the network service to apply this change:
echo "net.ipv4.ip_forward = 1" > /etc/sysctl.d/ip_forward.conf
systemctl restart network


That’s it. You should be able to connect with iodine to your server by using the address t1.<<yourdomain>>.

An Android client that seems to work pretty good and I use is AndIodine, and is available via the F-Droid catalogue.

Please leave a comment if this post was helpfull in any way.

When I tried to compile my own Android ROM, I got the following error:

CHK     include/linux/version.h
target Executable: skia_gm (/media/ssd/buildout//target/product/i9100/obj/EXECUTABLES/skia_gm_intermediates/LINKED/skia_gm)
target Executable: skia_test (/media/ssd/buildout//target/product/i9100/obj/EXECUTABLES/skia_test_intermediates/LINKED/skia_test)
target Executable: test-opengl-configdump (/media/ssd/buildout//target/product/i9100/obj/EXECUTABLES/test-opengl-configdump_intermediates/LINKED/test-opengl-configdump)
CC      scripts/mod/empty.o
/bin/sh: 1: /home/ted/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-gcc: not found
make[4]: *** [scripts/mod/empty.o] Error 127
make[3]: *** [scripts/mod] Error 2
make[2]: *** [scripts] Error 2
make[2]: *** Waiting for unfinished jobs....

The problem was that the arm toolchain wasn’t installed. After installing the toolchain compiling succeeded.

Installing the toolchain can be done with the following command:
git clone https://android.googlesource.com/platform/prebuilt

After that, run the following command to add the toolchain to the PATH variable:
export PATH=$(pwd)/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin:$PATH

Compiling should now succeed without the previous error.

I’ve found this information on http://source.android.com/source/building-kernels.html, a very helpful information source for Android development.