Re: Hummingboard DTB (imx6)
SPI channels but no VGA, HDMI, etc. It has 7 or so A/D inputs that
were meant for digitizing touchscreen inputs. I don't know if it's
fast enough to run X and VNC.
On 11/19/17, Alan Corey <alan01346@gmail.com> wrote:
>> SPI support is labeled as broken in debian. And likely will remain so
>> until some one who understands it decides to work on it. Some of the
>> problem is in obtaining the headers for the gpio that is on the
>> individual card.
>>
>> Decent SPI support, as in error free writing at 41 megabaud, in 32 bit
>> packets, and reading back, error free, the results at 25 megabaud, from
>> a Mesa 7i90HD interface card over a 1" long cable, is currently done
>> ONLY from a user-space module that is now part of linuxcnc, and ONLY on
>> a raspberry Pi 3b. This code can probably be made to run on other
>> platforms, but so far I haven't even been successful at removing the "am
>> I running on a pi-3b checks". After that, then figure out how to get the
>> headers for the gpio part of the SoC thats on the boards you have, of
>> which there are apparently at least a dozen mutually incompatible
>> versions just from Broadcom. I'd certainly bow and give homage to the
>> person who can take rpspi.c and its limited header dependencies, rename
>> it to rkspi.c and make it run on the rock64 board at similar speeds.
>> Although its not that much faster than a pi, it comes without the very
>> small funnel that all non-gpio generated data must get (its an internal
>> usb2 hub) thru on a pi, and which throws away keyboard and mouse events
>> in wholesale amounts. The rock64, compared to the pi, feels to be at
>> least 5x faster than the pi will ever be because of this one difference
>> in internal architecture.
>>
>> A universal driver would be nice, but I suspect the best is going to be a
>> driver per platform. There is not a universal gpio, yet. Maybe another 5
>> years for the winner to be shook out of the bushes far enough to become
>> a standard.
>
> That's a drag, I bought a PocketBeagle a few months ago. SPI seems to
> be the only video. I'm still getting adapters together and such . It
> has 2 SPI
>
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