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Tux Machines
Posted by Roy Schestowitz on Aug 31, 2023
> For some, the Chumby was a peek at what could have been. That vision never died for [Doug Brown], and he has been working tirelessly on bringing mainline Linux kernel support to the customizable smart display. He has posted several updates but recently got graphics and the PWM backlight working.
> Of course, we covered when [Doug] first started working on the new kernel, so it’s high time we revisited the progress. The WiFi hardware uses a Marvell 88W8686 chipset, which talks over the SDIO bus, so it’s a matter of convincing the libertas driver to talk to it. With a USB to Ethernet adapter, [Doug] could boot new kernels over NFS, so he didn’t have to walk over to swap the SD card. After dealing with an unhandled fault when trying to read the SDHCI_HOST_VERSION register, [Doug] had access points showing up in NetworkManager but could not connect. As a nasty hack, he temporarily removed the interrupts and switched to polling in the driver. While that worked, it would never get upstreamed. A critical interrupt was being dropped, and commands went out of sequence. A second, perhaps ugly hack, read a register after acknowledging an SDIO interrupt, which seemed to work. But it was still a hack, and [Doug] wanted something cleaner. In a blind stroke of luck, he found the errata online and noticed that it mentioned that an interrupt could be missed when a signal was asserted. After follo
> DoomMonkey266 has created a Raspberry Pi-powered camera rig that can take seriously up-close shots of the Moon from way down here on Earth.
> Armed with a Raspberry Pi Pico W, a 3D printer, and Michael’s design files, Tomasz set about building his own “slightly unconventional” droid.
> If you live in a place where you can buy Arduinos and Raspberry Pis locally, you probably don’t spend much time worrying about your water supply. But in some parts of the world, it is nothing to take for granted, bad water accounts for as many as 500,000 deaths worldwide every year. Scientists have reported a graphene sensor they say costs a buck and can detect dangerous bacteria and heavy metals in drinking water.
> SiFive has just given a presentation at Hot Chips 2023 introducing the new high-performance P870 RISC-V core and its automotive equivalent the P870-A core, plus discussing RISC-V in general, its previous generation RISC-V cores, and what to expect going forward. SiFive has not officially announced the P870 and P870-A cores just yet, so most of the information we have from the English-spekaer Internet is from ServeTheHome who managed to get some presentation slides, but this is also corraborated by various Chinese sources on Baidu and Guokr. SiFive P870 and P870-A The P870 and P870-A RISC-V cores are new cores from the SiFive Performance family compatible with the RISC-V RVA23 profile and succeeding the SiFive P670 core.
> But now, New York City is no longer off limits (or at least as difficult to fly in) for drones. NYC Mayor Eric Adams announced this summer that the city has created a new permitting process that will allow businesses and organizations to fly drones within city limits. Of course, the announcement was also augmented with a fairly charming publicity stunt — where Mayor Adams himself piloted a drone.
> But we cut through all that jargon and learned the basics—well, I did. My Dad went the 'Extra' mile and ran through all three tests, relying on his 40 years of radio experience! We both have licenses now (I'm KFØMYB, and my Dad's KFØMYJ) and made our first contact. Here's a video documenting that entire journey (up to the point I sent out my first QSL card!): [...]
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