FreeBSD-wandboard build 269149

Recently I found myself wanting to understand how I2C for FreeBSD ARM, on the Pi works.  The first step is to understand the GPIO implementation on Pi, since on a Pi, I2C is implemented on the GPIO. So, here’s the basic summary. Firstly, the FreeBSD source browser is here. In the directory /sys/ is the…

The FDT file for Raspberry Pi, declares UART.  I’ve had quite a bit of trouble understanding how declaring a uart in the FDT results in /dev/tty0 and /dev/cuau0 appearing in /dev/ Here are the relevant lines from the FDT: uart0: uart0 { compatible = “broadcom,bcm2835-uart”, “broadcom,bcm2708-uart”, “arm,pl011”, “arm,primecell”; reg = <0x201000 0x1000>; interrupts = <65>;…

This build fixes the recent console speed bug, and include super-pages, a new feature recently added to the ARM kernel. The image file is here, and the boot log is here.

I got interested in building my own wireless point after seeing some of the wireless firmware issues like this.  Besides, I’ve always been interested in embedded devices and FreeBSD. So, the first step was a device.  I chose to use a Wandboard.  I’m a committer to Crochet-FreeBSD, so I built out the device support for…

I recently got a Beaglebone Black.   I was very excited; it’s similar to a Pi, but has 60 GPIO ports! Getting a serial console up on it was not quite a simple as I thought, since the BeagleBone uses FTDI.  Following the instructions here I installed the OS X serial driver for FTDI.   After plugging…

I’ve been making FreeBSD-Current builds for my Raspberry Pi.  Naturally I wanted to try out the GPIO support to find out just how simple it is to use.   Here’s an example, and the full code is here. int main (int argc, char *argv[]) { char *device = “/dev/gpioc0”; int gpiofd = open(device, O_RDWR); if…