QEMU : Installing Debian on Qemu emulated MIPS - Linux(x86) host

Hello People, So, Here I needed to test some drivers functionality with 16K page size specifically. After walking through my options I settled with Linux on Qemu emulated MIPS. QEMU is a generic and open source machine emulator. Here are the steps to install Debian on emulated MIPS machine using Qemu: Preparation: Here I am using Ubuntu 14.04 x86 system as my host machine. 1 . Installing Qemu on host system - install qemu package, apt-get...

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Android CTS 7.0_r1 : Running modules list through automated script

Hello Guys, How are you doing? hope all is well. Its been while, lets get started! So whats new? Yeah Android 7 is new! Android 7 has been out now for a while and everybody (device vendors) wants it up and running as soon as possible. So here I am trying to get Android 7 up for some super secrete project, just kidding, yes I (and my team) had just completed bring up of the device with Android N (i.e. Android 7, called Nougat) yeeeh! but that's...

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Ubuntu 14.04 : How to install 4.4.8 Kernel

Hello, Here are some simple steps to install Kernel 4.4.8 on your Ubuntu machine. Open terminal and execute following commands in given order. 32bit Ubutnu: Lets download the packages needed for installation. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that...

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issue "/usr/include/linux/errno.h:1:23: fatal error: asm/errno.h: No such file or directory" while cross-compiling

Aloha, So, making this post as it did cost me more than couple of hours to figure-out what the hell is happening. I was building some (secrete) driver for android yesterday and I needed to install cross-compile tool-chain  for same, but while installing tool-chain on Ubuntu some of the packages already installed got removed by package installer. Next, I set up the environment for building driver and kicked the build. Suddenly I started getting following error from compiler: ...

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Tmuxing with Tmuxinator

Ooolo, So, Here is what’s happened, I was doing some testing with driver for #top_secrete project. So each time to test my driver, I have to go through following steps, - ssh to target platform (tab0), run vim to edit code - ssh to target platform (tab1), cd to source dir - source environment - build/install - ssh to target (tab2), cd to log dir and start ldmesg script to continuously monitor dmesg logs - ssh to target (tab3), cd to test dir and start test (server) - ssh to target (tab3), cd to test dir and start test (client). aahh,...

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How to increase vmalloc size [vmalloc: allocation failure]

Hello, So this is what happened, I was working on the graphics driver and testing some GLBenchmark applications to see if everything is smooth and healthy. But one of the test was always failing for unknown reason (at that time). I have put more than couple of hours to debug that. I was ignoring some errors in dmesg (kernel log) that I was getting, May 18 14:53:38 pc-vbox kernel: [412318.373157] vmap allocation for size 37752832 failed: use vmalloc=<size> to increase size.May 18 14:53:38 pc-vbox kernel: [412318.373161] vmalloc: allocation...

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Capture and monitor dmesg continuously

Greetings folks! If you are working on device drivers for Linux/Android we do rely on dmesg for almost all of the times. But you know the dmesg buffer is limited, its circular buffer. So what ever overflows the buffer is lost for good (?). We feel need to increase the buffer size but its not trivial task and also most of the times enough is just not enough! Here are some simple scripts for Linux to log dmesg continuously and dump into file and...

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