Introduction This is my 3rd blog posting on the topic of the Crochet-FreeBSD ARM boot process. The other two are here and here. At long last, I have the Crochet-FreeBSD build for Wandboard working properly, with U-boot and ubldr. This article will serve, I hope, to document the entire process and give others a…
Some time ago I was part of the effort to add Wandboard support to Crochet-FreeBSD. I wrote a blog posting about it here. An explanation of how Crochet-FreeBSD boots the Wandboard is below: The Wandboard uses U-Boot as its initial boot-loader. A number of patches to the U-Boot source are required, and you…
Adding Wandboard support to Crochet-FreeBSD has been a project of mine for a while. After this fascinating kernel fix, I can now build a working image and boot FreeBSD-Current. Here is an example boot log, and here’s an image file. The output of dmesg, with a USB wireless adapter in the board, is: KDB:…
AntlrI4DE is an Eclipse plugin for editing Antlr4 grammars. One of the features I used to really like in the original Antlr IDE was the ability to generate railroad diagrams. It turns out that Antlr4IDE has this feature, so I decided to give it a try. My jvmBasic grammar is here, and you can…
Commons Math is an Apache library which includes a variety of mathematical tools, including 1st and 2nd-order ODE solvers. In order to familiarize myself with the ODE solvers, I wrote a simple program to solve an RC charging circuit. The circuit has these parameters: R (ohms), the resistance of the resistor C (farads), the capacitance…
I’ve recently becoming interested in porting legacy PHP sites to JSPs. It seemed to me that one of the hardest parts of this problem was parsing the PHP code. Once a parse tree was created, the next step would be to emit equivalent JSP code. I went looking for an ANTL4 grammar for PHP,…
I’ve always had a fascination with compilers. As a Java geek, I’m also quite interested in the JVM. In order to learn a little more about both, and as a way to contribute to the open source world, I decided to implement a compiler for BASIC. So, jvmBasic consumes BASIC code and emits .class…
I’ve bee hacking away trying to set up Crochet-BSD to build boot images for Wandboard. Wandboard uses Cortex A9 processor, so it’s ARM. The linux distros for it use U-Boot, so that seemed like a likely place to start for FreeBSD. Looking at the Wandboard Wiki, there is an article on U-Boot which explains how…
Image is here. Boot log is here.
Having built FreeBSD numerous times, I thought it would be interesting to know how to build NetBSD. The instructions from the NetBSD documentation are here. Firstly get the sources. An easy way is to simply FTP them. I got the NetBSD 6.1.2 sources from here. These files are all tarballs, so they’ll need to be…