[Openec] XO-1.75 OpenEC code location and other interesting information (was: Re: [Gnewsense-dev] OpenEC on OLPC XO 1.75)

[Daniel Clark]

On Fri, Jul 9, 2010 at 4:17 AM, Karl Goetz <karl at kgoetz.id.au> wrote:

> On Thu, 8 Jul 2010 23:19:54 -0400
> Daniel Clark <dclark at pobox.com> wrote:
>
> > FYI no code yet, but promises that may help the effort to get OpenEC
> > working on Lemote Yeeloong...
>
> Interesting news.
>
> > The exception is because EnE has not released the low-level details on
> > the PS/2 interface in the KB3930, so there will be some code that is
>
> Does anyone know what functionality is lost by this code being
> proprietary? (if we removed it).
> kk
>
> > not available -- relative to the codebase this is a very small amount
> > of code.  The GPL licensing exception will allow for linking against
> > this closed code.  We're going to investigate ways to move away from
> > this code in the future.  (As far as we're aware, this will make the
> > XO-1.75 the first laptop with open embedded controller code!)
>

Sending to a lot of lists with people who might be interested, but for
replies I'd suggest signing up for and then replying only to the
http://lists.laptop.org/listinfo/openec list, which is very low-volume.
Archives at http://lists.laptop.org/pipermail/openec/

FYI actual location of the code and some other interesting info. I'll also
go update http://wiki.laptop.org/go/OpenEC with this location as the
location currently mentioned has really old code (2009).

Perhaps this will also be helpful with OpenEC on Lemote Yeeloong work (FSF
donated a few Yeeloongs to people who wanted to work on that a while ago,
but as far as I know there has not been a lot of progress there.)

cjb | djbclark: http://dev.laptop.org/git/users/rsmith/ec-1.75 for all your
openec needs
cjb | (it's actually the repo we're using to bring up the 1.75 right now)
dilinger | cjb: is this xo-1 EC minus battery code, or written from scratch?
cjb | dilinger: battery code's in there, AIUI
cjb | the patent was on the NiMH battery charging, and we don't use those
batteries anymore, only LiFePO4
dilinger | cjb: awesome
dilinger | so is that imported into OFW now, or do you still build the EC
separately?
cjb | on 1.75 they're more independent than before
cjb | they don't flash a new EC at the same time as flashing a new OFW
cjb | so they aren't built together
dilinger | interesting
cjb | OFW also isn't the first thing that runs anymore
cjb | the mmp2 has two cores, security processor and the main CPU (PJ4)
cjb | comes up in cforth on the SP, that loads from SPI into SRAM and
releases the PJ4
cjb | the SP keeps running
cjb | which is neat because you can make it watch a GPIO/button
cjb | and if the PJ4 hangs, you hit that button, the SP takes over the
serial port again, and it has full access to RAM and peripheral state for
debugging
cjb | so there's an always-available method for getting dmesg after a crash
dilinger | SP continues running OFW the entire time?
dilinger | is it drawing full power, or is it some kind of low power mode
(similar to the low power EC mode)?
cjb | (cforth, not OFW)
cjb | yeah, I think it's drawing power
cjb | we'll have to work out how that's supposed to work later

--
        \|/      Daniel JB Clark | Activist; Owner
FREEDOM -+-> INCLUDED ~ http://freedomincluded.com
        /|\      Free Software respecting hardware
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