Andrey Mikhalchuk’s Blog

On some linux machines when you run wireshark you may notice that a lot of packets are marked as invalid (highlighted as black). The contents looks perfectly correct, but for some reason checksum is brkoen and wireshark suggestes that the reason for such unpleasant event is “TCP checksum offload”. Let’s fix it …

I was recently compiling some Arduino code with NewSoftSerial and got hit by infamous “Error: register r24, r26, r28 or r30 required” error. NewSoftSerial is a great library and those using older avr-gcc compiler enjoy it alot. Problem is the newer gcc doesn’t like one nasty error in the code and here is how to fix it …

If you dare to build OpenOCD from svn trunk and lucky to have a USB JTAG adapter there is a good chance you will see something like

/bin/sh ../libtool --tag=CC --mode=link gcc -std=gnu99 -g -O2 -I/root/Distr/ftd2/libftd2xx0.4.16 -Wall -Wstrict-prototypes -Wformat-security -Wextra -Wno-unused-parameter -Wbad-function-cast -Wcast-align -Wredundant-decls -Werror -o openocd main.o libopenocd.la -ldl /root/Distr/ftd2/libftd2xx0.4.16/static_lib/libftd2xx.a.0.4.16 -lpthread
libtool: link: gcc -std=gnu99 -g -O2 -I/root/Distr/ftd2/libftd2xx0.4.16 -Wall -Wstrict-prototypes -Wformat-security -Wextra -Wno-unused-parameter -Wbad-function-cast -Wcast-align -Wredundant-decls -Werror -o .libs/openocd main.o /root/Distr/ftd2/libftd2xx0.4.16/static_lib/libftd2xx.a.0.4.16 ./.libs/libopenocd.so -ldl -lpthread
./.libs/libopenocd.so: undefined reference to `FT_GetLatencyTimer'
./.libs/libopenocd.so: undefined reference to `FT_Close'
./.libs/libopenocd.so: undefined reference to `FT_SetBitMode'
./.libs/libopenocd.so: undefined reference to `FT_GetDeviceInfo'
./.libs/libopenocd.so: undefined reference to `FT_OpenEx'
./.libs/libopenocd.so: undefined reference to `FT_Read'
./.libs/libopenocd.so: undefined reference to `FT_SetTimeouts'
./.libs/libopenocd.so: undefined reference to `FT_SetVIDPID'
./.libs/libopenocd.so: undefined reference to `FT_Write'
./.libs/libopenocd.so: undefined reference to `FT_SetLatencyTimer'
./.libs/libopenocd.so: undefined reference to `FT_ListDevices'
./.libs/libopenocd.so: undefined reference to `FT_Purge'

Here is how to fix that:

This is a famous/popular question in many Linux forums. The typical answer to the question is “Login (especially autologin) into a system as root is bad”. That’s right, but WTH! The person is asking how to do that, not if it is good or bad! If you don’t know the answer, don’t answer the question you’re not asked about!!
Anyway, if you need to autologin as root for some reason here is the recipe for Open SuSE 11.1 KDE 4.2.2 that could work for other Linux/KDE combinations:

In some versions of KDE (like 4.2.2) there is a bug in knote that prevents users from resizing the note. The bug is fixed in 4.2.3, but if you are still using 4.2.2 you still can resize it.