The Gig of Ham

One geek's contributions to the series of tubes

Jun 11, 2016 - 1 minute read - Comments - 905S ARM Internet linux sysadmin

Quick update: Sub $200 Stratum 1 NTP Server with ODROID and Adafruit parts

I was building another one of these, and found some bugs in my previous post. I’ve corrected the post, the biggest being that the kernels in Armbian 5.10 and later include a 1-Wire interface in the DTB which conflicts with the 1PPS pin used by the GPS module. The solution is to either comment out the w1 stanza in the device tree, or move it to another pin. I moved it to GPIOY_7 which is two pins down on the same row of the connector.

Jun 2, 2016 - 10 minute read - Comments - 905S ARM Blog Internet linux ODROID-C2 sysadmin

Sub $200 Stratum 1 NTP Server with ODROID and Adafruit parts

Time is important. In modern computing, I would say time is second in importance only to good entropy. Unfortunately, getting accurate, reliable time is getting harder. The global NTP pool is under attack, and worse it’s also being used as an amplification vector for DDOS attacks. Primarily because of those two reasons, I’ve decided to block NTP traffic at the border of all Data Center. But this leave a problem: how to get time.

Apr 3, 2016 - 8 minute read - Comments - Oculus VR

Oculus Rift: My Thoughts

I’ve had the Oculus Rift setup and working for a few days now, and had several friends over to get a variety of opinions, and..well..we’re slightly disappointed. Ergonomics This is the one place where there is very little improvement since the DK2 and in some cases it’s backwards. Like me, most of my friends wear glasses and that’s the biggest problem. Thin framed wire glasses or metal frames are fine but if you have thicker framed glasses like those from Warby Parker just don’t fit well.

Mar 30, 2016 - 4 minute read - Comments - Uncategorized

Oculus Rift: Initial Impressions

This isn’t a full review, I’ve only played with the Rift briefly tonight and wanted to get some thoughts down before heading to bed for an early morning. I’m planning on a much more complete review later, and a complete review of the Vive I should be getting in a couple of weeks, and finally a compare and contrast between the Vive and the Rift. In the mean time, here are the initial thoughts:

Feb 12, 2016 - 5 minute read - Comments - ARM Blog

Mainline Linux 4.4 kernel on a Jetson TK1

I was really hoping this would be easier than it was. Most (all?) of the pieces needed are upstream, with a minor patch for das U-boot needed to make it all work with L4T. I’m going to provide links to my u-boot images and kernel packages, but first I wanted to go over what I’ve done and why. My Jetson TK1 still has L4T installed on the internal eMMC device.

Jan 28, 2016 - 6 minute read - Comments - ARM RK3368

The very overdue ARM update

Lots to get to, so I’ll just jump right in: Uppel CX-R8 I gave up on this device a bit too soon it seems. Someone found these blog posts and reached out about rooting a CX-R8. While I wasn’t able to help him much, he helped me greatly by providing links to a TWRP recovery image which makes it super simple to install a SuperSU file to the system allowing root access.

Dec 6, 2015 - 6 minute read - Comments - Arcade

The Arcade Project

I love arcade games. Some of my favorites are S.T.U.N. Runner, Teenage Mutant Ninja Turtles, Sinistar, and Tempest. I like the fighting games like Street Fighter, King of Fighters, Mortal Kombat, etc but are not very good at them. Ten years ago, I worked for a video game company and my “boss” also very much liked Arcade games. So he brought is personal collection about 30 of them in to work and littered them about the office.

Dec 5, 2015 - 7 minute read - Comments - ARM linux RK3368 sysadmin

Hacking the Uppel/Sunchip CX-R8, Rikomagic MK68, and Tegra Jetson TK1

Long overdue follow-up from my previous post. Let me dive in by topic: Uppel/Sunchip CX-R8 After a lot of roadblocks, I’ve given up on this particular platform. The primary reason for this was getting the MK68 boxes and being able to compare the two. The CX-R8 is pretty hacker un-friendly. The bootloader does some form of signing the boot, recovery, and kernel images. All of the existing Rockchip tools I could find to make these images say the ones from the device have bad checksums, and the images it creates the device reports as having bad checksums.

Nov 10, 2015 - 3 minute read - Comments - Android ARM Blog RK3368 sysadmin

Hacking the Uppel/Sunchip CX-R8

As part of my job at Chef, I’m responsible for getting Chef on strange platforms. At the 2015 Chef Seattle Community Summit, I discovered that the community has a lot of interest in getting Chef on strange platforms as well. I was helping a community member get Chef running on an ARMv8 (also known as AArch64 or ARM64 depending on your platform or compiler), but I needed an inexpensive platform to put in the forthcoming community builds CI.