Ghost in the wire

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List of 54 Hacks

#1 – Need to jot down something quickly? Open a temporary notepad in your browser by typing “data:text/html, <html contenteditable>” into the address bar. Remember to bookmark and rename it as Notepad. #2 - At website login pages, you can view masked passwords by changing the password input type as text. Most software and web developers probably know this. So, don’t leave your PC on! #3 - Test battery easily by dropping it few inches from the ground. A fully charged battery bounces very little, whereas a dead battery bounces around. Not really sure how to conduct the battery bounce test? Here’s a demo video. https://www.youtube.com/watch?v=nwfFBUVxpac . #4 - In Windows, create a new folder and name it “Control Panel Shortcuts.{ed7ba470-8e54-465e-825c-99712043e01c}”. Access any control settings in the folder. #5 - No description needed. #6 - Use wall hooks to attach iPad to the wall. #7 - Project Naptha...

Mastering Embedded Linux Programming: Building a Root Filesystem (4/16)

Building a Root Filesystem The root filesystem is the fourth and the final element of embedded Linux. Once you have read this , you will be able build, boot, and run a simple embedded Linux system. The techniques I will describe here are broadly known as roll your own or RYO . Back in the earlier days of embedded Linux, this was the only way to create a root filesystem. There are still some use cases where an RYO root filesystem is applicable, for example, when the amount of RAM or storage is very limited, for quick demonstrations, or for any case in which your requirements are not (easily) covered by the standard build system tools. Nevertheless, these cases are quite rare. Let me emphasize that the purpose of this is educational; it is not meant to be a recipe for building everyday embedded systems: use the tools described in the next for this. The first objective is to create a minimal root filesystem that will give us a shell prompt. Then, using th...

Mastering Embedded Linux Programming: Selecting a Build System (5/16)

Selecting a Build System In the preceding's, we covered the four elements of embedded Linux and showed you step-by-step how to build a toolchain, a bootloader, a kernel, a root filesystem, and then combined them into a basic embedded Linux system. And there are a lot of steps! Now, it is time to look at ways to simplify the process by automating it as much as possible. I will look at how embedded build systems can help and look at two of them in particular: Buildroot and the Yocto Project. Both are complex and flexible tools, which would require an entire to describe fully how they work. In this , I only want to show you the general ideas behind build systems. I will show you how to build a simple device image to get an overall feel of the system, and then how to make some useful changes using the Nova board example from the previous s. In this , we will cover the following topics: Build systems Package formats and package managers Build...

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