Raspberry Pi 3 Is Looking Towards Upstream Kernel Support
Written by Michael Larabel in Hardware on 3 March 2016 at 08:36 PM EST. 26 Comments
With the Raspberry Pi 3 64-bit ARM $35 development board that launched earlier this week, there is working open-source kernel code for this new board powered by the Broadcom BCM2837 and it's looking like it hopefully won't be too long before the support is mainlined.

Eric Anholt at Broadcom who is known for his work on developing the VC4 open-source graphics driver stack for the Raspberry Pi on Linux has also been acting as the kernel maintainer for all things Pi.

Today on his blog Anholt wrote, "I spent most of [the month] working on the Raspberry Pi 3 support so I could have a working branch for upstream day 1. That involved cleaning up the SDHOST driver for submission, cleaning up pinctrl DT, writing an I2C GPIO expander driver, debugging the I2C controller, fixing HDMI hotplug handling, debugging EMMC (not quite done!), scraping together some wireless firmware, and a bunch of work trying to get BT working on the UART. I'm happy to say that on day 1 I published a branch that worked the same as a RPi2, and by the end of the day I had wireless working. Some of the patches are now out for review, and I'll be working on cleaning up the rest in the near future." (As mentioned earlier, on the graphics side, getting the RPi3 working with the VC4 graphics driver requires just a few fixes.)

Eric also noted in today's blog post he has been working on getting some display panel working with his VC4 driver. Unfortunately, he doesn't have the official 7-inch DSI touch-screen working with his driver as he is running into DSI (Display Serial Interface) problems. However, he is having luck with a DPI panel using the Adafruit Kippah and will have patches for that support soon.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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