--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Fri, Mar 2, 2018 at 10:26 PM, Richard Wilbur <[email protected]> wrote: > On Mar 1, 2018, at 20:30, Luke Kenneth Casson Leighton <[email protected]> wrote: > > > Sent from my iPhone >> On Thu, Mar 1, 2018 at 9:46 PM, Richard Wilbur <[email protected]> >> wrote: >>> It looks to me like the fastest way to test the GPIO lines connected >>> on the micro-desktop board to VESA_SCL and VESA_SDA would simply be to >>> connect a VGA monitor to the micro-desktop and make sure it is >>> properly detected and a test image looks right on it. >> >> yep, pretty much... with one slight fly in the ointment: the SCL and >> SDA lines are straight GPIO and will need a bit-banging I2C linux >> kernel driver. once that's configured, doing i2cdetect _should_ be >> enough to test the circuit, although scanning the data and running >> read-edid on it would be awesome and amazing: it would mean being able >> to *really* do proper VESA detection. > > Is someone already working on that? no. > Sounds like we need the device tree for the micro-desktop to be > populated. patches to linux mainline are needed to include the ability to have devicetree fragments before that can happen. however... the A20 linux sunxi mainline source is *not 100% functional* so it's kinda moot. > If we did it for micro-desktop v1.7 it would be something to build off for > micro-desktop v1.8 and also a good place to begin for the laptop. > > From what I'm hearing, once the device tree is ready we could work > on "automagically" configuring the VESA DDC driver to bit-bang the > correct GPIO pins. Does the bit-banging VESA DDC driver exist already? > (I wrote a bit-banging I2C driver in VxWorks at a previous position so > the topic is not foreign.) i found a random driver somewhere for I2C - don't know about the linking to userspace / DDC. > If none of this is underway I'll continue mapping things out so we can > create the device tree for the micro-desktop. that would be useful... *if* the A20 linux sunxi mainline source supports 100% of the functionality of an A20. > If I remember correctly we also should create a device tree for the DS-113 > v2.7.4 and v2.7.5? again same caveat.... *thinks*.... yeah. > I'd be happy to work on that if you think that is the highest > priority right now. It sounds like it will help both testing and > deployment. let me think... two conditional things need to happen: 1. the A20 sunxi mainline code needs to have 100% functionality support for ALL hardware 2. the "devicetree fragment" patch also needs to be confirmed as mainline. then it's useful. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
