Updating boot camp graphics drivers

18-Apr-2016 04:46 by 4 Comments

Updating boot camp graphics drivers

Since starting this page there have been two developments which make the process somewhat easier - a program has been developed which allows the use of an unmodified operating system by working in user-mode rather than kernel-mode PPS, and a module is now available which plugs directly onto the 26-pin GPIO header of the Raspberry Pi, so no soldering is involved.My thanks to Folkert van Heusden and Anthony Stirk for these developments.

This unit is a "timing" GPS, with 15 ns specified accuracy for the PPS signal.

Offsets are reported to be with about /-5 milliseconds (and therefore off-scale once on the graph below).

The four-line Changing to a tight coupling to a local stratum-1 server on the LAN produces much better results, with timekeeping in the order of 30 microseconds.

As an experiment, I purchased one of the low-cost credit-card-size Raspberry Pi computers, and have configured it to run NTP (Network Time Protocol).

I have also used this board with a GPS receiver with pulse per second (PPS) output to make a stratum-1 NTP server, but as I know little of Linux, it has taken some time to achieve this aim!

If you want to get started quickly, with the best results for minimum fuss, please see my Raspberry Pi NTP quick-starter page.

Please also see that page for issues with the Jessie release of Linux, and with the newer Raspberry Pi model 3.Note: these graphs are not all to the same vertical scale!The resulting performance is good, but it will depend on both the loading of the link between me and the ISP, and the general load on the ISP's network and the general Internet.(Thanks to Joe, HB9DRT for the information on snow - I've only seen that problem once here during an exceptionally cold winter).The Raspberry Pi is a credit-card size computer, available from distributors across the world.I start by describing how to get the Raspberry Pi running with just a LAN connection - no display, keyboard or mouse - a so-called headless operation.