Re: [Arm-netbook] HDMI High-Frequency Layout: Recommendations Vias Moveable?

2017-11-22 Thread Luke Kenneth Casson Leighton 
On Wed, Nov 22, 2017 at 6:56 PM, Richard Wilbur
 wrote:

> If they are grounding power capacitors, don't move them unless you
> can do so while maintaining (or better yet shrinking) the distance
> from capacitor pad to via.  Low impedance power is precious!

 ok :)

>> also i just noticed that TX1N/P has that little kink, it turns 45
>> degrees anti-clockwise (from the long horizontal straight) about 15mil
>> late, and i really don't know why :)
>
> It seems you decided to split up the extra width needed to accommodate
> the ground vias between TX0 and the clock lines across all the Northeast
> bends and then move TX1 and TX0 to avoid running into the ground vias.

 something like that... yeah.  i've been experimenting with x11
settings recently so haven't fired up PADS in a while (as X11 crashes
terminate the QEMU VM with prejudice, which is bad).  i remember that
the priority was to get the layer-changing points to be running
east-west, because in previous iterations having them run NE<->SW was
a disaster.  that in turn had knock-on effects back down the line..

l.

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Re: [Arm-netbook] HDMI High-Frequency Layout: Recommendations Vias Moveable?

2017-11-22 Thread Richard Wilbur 
On Nov 22, 2017, at 10:08, Luke Kenneth Casson Leighton  wrote:
> they're not really optional, they're GNDing VIAs for a couple of
> capacitors on the TOP layer, associated with the PMIC area.  i'll take
> a look, see what they're for: it *might* be possible to move them
> direclly south or south east, to the edge of the exclusion area.

If they are grounding power capacitors, don't move them unless you can do so 
while maintaining (or better yet shrinking) the distance from capacitor pad to 
via.  Low impedance power is precious!

> also i just noticed that TX1N/P has that little kink, it turns 45
> degrees anti-clockwise (from the long horizontal straight) about 15mil
> late, and i really don't know why :)

It seems you decided to split up the extra width needed to accommodate the 
ground vias between TX0 and the clock lines across all the Northeast bends and 
then move TX1 and TX0 to avoid running into the ground vias.  I see both TX1 
and TX0 jogging back to 15mil inter-pair (between pair) spacing after they turn 
Northeast.  Had we closely maintained that spacing in the corner, the bends in 
TX2 would have pointed through the bends in TX1, TX0, and TXC.  Actually, the 
corner in the northern keep away for the ground fill would look through the 
corners in TX2, TX1, TX0, TXC, and the southern keep away for ground fill.

> less complicated is good

I agree.  I try to avoid unneeded complication.  Therefore it comes down to 
balancing priorities:  the most important things generally represent "needed" 
complexity.

Richard
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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Luke Kenneth Casson Leighton 
On Wed, Nov 22, 2017 at 5:10 PM, Vincent Legoll
 wrote:

> I knew that very well, that's my homepage ;-)
> Waiting for HDMI / H3 also...
>
> But your advocating people to continue to work on ultra-obsolete versions
> (security-wise, etc) instead of pushing people to work on upstream is what
> I found kind of strange.

 well... they could focus on GuixSD... or they could focus on *not*
doing GuixSD (at all, because half the stuff won't work) and instead
do linux kernel development.  if they'd said, "we're linux kernel
developers, we'd like to focus on improving mainling Allwinner A20
functionality so that OSes like GuixSD have 100% full functionality
for our users" i would have said, "great, here's the link to the
mainline linux-sunxi page"...

 l.

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Vincent Legoll 
>> Looking at http://linux-sunxi.org/Linux_mainlining_effort , I see that
>> HDMI is listed as "in linux mainline since 4.15". Yey!
>
>  progrss slow but getting there.
>
>> LVDS is still listed as "WIP" and VGA and CVBS are still listed as red
>> no-s, and VE (Video Engine) is listed as WIP.
>
>  make sense now, vincent?

I knew that very well, that's my homepage ;-)
Waiting for HDMI / H3 also...

But your advocating people to continue to work on ultra-obsolete versions
(security-wise, etc) instead of pushing people to work on upstream is what
I found kind of strange.

But that's my personal opinion, and you're right to chose what's best for
the eoma project. We may not have the same priorities.

No harm intended

Tchuss

-- 
Vincent Legoll

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Re: [Arm-netbook] HDMI High-Frequency Layout: Recommendations Vias Moveable?

2017-11-22 Thread Luke Kenneth Casson Leighton 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Nov 22, 2017 at 4:55 PM, Richard Wilbur
 wrote:
> Working on the high-frequency taper, a couple things have been
> bothering me--the two ground vias circled in the attached picture.
>  Are they either optional or moveable?

 they're not really optional, they're GNDing VIAs for a couple of
capacitors on the TOP layer, associated with the PMIC area.  i'll take
a look, see what they're for: it *might* be possible to move them
direclly south or south east, to the edge of the exclusion area.

 also i just noticed that TX1N/P has that little kink, it turns 45
degrees anti-clockwise (from the long horizontal straight) about 15mil
late, and i really don't know why :)


> If so, even moving them East or Northeast takes some pressure
> off the taper.  If not, we'll work around them but it is a little more 
> complicated.

 less complicated is good

l.

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Luke Kenneth Casson Leighton 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Nov 22, 2017 at 4:16 PM, Tzafrir Cohen  wrote:
> On Wed, Nov 22, 2017 at 04:10:16PM +, Luke Kenneth Casson Leighton wrote:
>> ---
>> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>>
>>
>> On Wed, Nov 22, 2017 at 4:02 PM, Vincent Legoll
>>  wrote:
>> > Hello
>> >
>> > On Wed, Nov 22, 2017 at 4:37 PM, Luke Kenneth Casson Leighton
>> >  wrote:
>> >
>> >> stick with the known / tried-and-tested 3.4.104+ linux-sunxi kernel.
>> >
>> > You must be kidding, right ?
>>
>>  nope, not at all.  it's still the only available version of the linux
>> kernel that has 100% proven, finished and *working* support for *all*
>> functions of the Allwinner A20 processor.
>>
>>  if you don't want or don't need HDMI, don't want video support, or a
>> shed-load of other functionality, feel free to use mainline linux
>> kernel source.
>
> Looking at http://linux-sunxi.org/Linux_mainlining_effort , I see that
> HDMI is listed as "in linux mainline since 4.15". Yey!

 progrss slow but getting there.

> LVDS is still listed as "WIP" and VGA and CVBS are still listed as red
> no-s, and VE (Video Engine) is listed as WIP.

 make sense now, vincent?

l.

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Tzafrir Cohen 
On Wed, Nov 22, 2017 at 04:10:16PM +, Luke Kenneth Casson Leighton wrote:
> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
> 
> 
> On Wed, Nov 22, 2017 at 4:02 PM, Vincent Legoll
>  wrote:
> > Hello
> >
> > On Wed, Nov 22, 2017 at 4:37 PM, Luke Kenneth Casson Leighton
> >  wrote:
> >
> >> stick with the known / tried-and-tested 3.4.104+ linux-sunxi kernel.
> >
> > You must be kidding, right ?
> 
>  nope, not at all.  it's still the only available version of the linux
> kernel that has 100% proven, finished and *working* support for *all*
> functions of the Allwinner A20 processor.
> 
>  if you don't want or don't need HDMI, don't want video support, or a
> shed-load of other functionality, feel free to use mainline linux
> kernel source.

Looking at http://linux-sunxi.org/Linux_mainlining_effort , I see that
HDMI is listed as "in linux mainline since 4.15". Yey!

LVDS is still listed as "WIP" and VGA and CVBS are still listed as red
no-s, and VE (Video Engine) is listed as WIP.

-- 
Tzafrir Cohen | tzaf...@jabber.org | VIM is
http://tzafrir.org.il || a Mutt's
tzaf...@cohens.org.il ||  best
tzaf...@debian.org|| friend

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Luke Kenneth Casson Leighton 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Nov 22, 2017 at 4:08 PM, Mathieu Othacehe  wrote:
>
> (+ Ludo and Danny)
>
> Hi Luke and Eric,
>
>>  great!  let's take a look...
>> https://lists.gnu.org/archive/html/guix-devel/2016-07/msg00515.html
>> ha!  looks like someone's been working on porting GuixSD to ARM
>> already.  it shouuuld be an extremely straightforward task if you're
>
> Yes Danny has been involved in the GuixSD bootloader serie too. I guess
> he would be interested in a pre-production unit too.

 i've only got around six or seven available of the 2.7.4 units, or
thereabouts.  i need to keep two, one as a backup in case one gets
damaged (it happens).

 one way round that would be to use a VPN (i run one), set up the unit
at one location and rsync packages over to it for testing in a chroot
environment on the card.  it'll... need a little coordination :)

 or, i could in theory set up one of the two i need to keep hold of
here in TW and leave it switched on 24x7?


> I'm currently working on porting GuixSD on a BBB and have almost
> succeded to boot it. So porting EOMA68-A20 should only consist in picking
> the right kernel/u-boot as you stated.

 yehyeh.  the way i do different OSes is simply replace the root
filesystem partition on pre-existing micro-sd cards.  i'll make sure
to include something (debian/testing armhf most likely - just don't do
"apt-get update" on it as it will pull in a shed-load of stuff that's
been done over the past... 2, 2.5 years)

l.

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Luke Kenneth Casson Leighton 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Nov 22, 2017 at 4:02 PM, Vincent Legoll
 wrote:
> Hello
>
> On Wed, Nov 22, 2017 at 4:37 PM, Luke Kenneth Casson Leighton
>  wrote:
>
>> stick with the known / tried-and-tested 3.4.104+ linux-sunxi kernel.
>
> You must be kidding, right ?

 nope, not at all.  it's still the only available version of the linux
kernel that has 100% proven, finished and *working* support for *all*
functions of the Allwinner A20 processor.

 if you don't want or don't need HDMI, don't want video support, or a
shed-load of other functionality, feel free to use mainline linux
kernel source.

l.

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Vincent Legoll 
Hello

On Wed, Nov 22, 2017 at 4:37 PM, Luke Kenneth Casson Leighton
 wrote:

> stick with the known / tried-and-tested 3.4.104+ linux-sunxi kernel.

You must be kidding, right ?

-- 
Vincent Legoll

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Re: [Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Luke Kenneth Casson Leighton 
On Wed, Nov 22, 2017 at 9:38 AM, Eric Bavier  wrote:
> Hello lkcl,

 hi eric

> (Resending to list, hopefully it makes it this time)
>
> We have a GNU Guix developer who is interested in working on bootloader
> and general software support in GuixSD for the EOMA68-A20.

 great!  let's take a look...
https://lists.gnu.org/archive/html/guix-devel/2016-07/msg00515.html
ha!  looks like someone's been working on porting GuixSD to ARM
already.  it shouuuld be an extremely straightforward task if you're
prepared to stick with the known / tried-and-tested 3.4.104+
linux-sunxi kernel and the known tried-and-tested u-boot.

> If there is still a pre-production unit available,

 yes there is.

>  please get in touch
> so we can work out how to get them set up.  I've agreed to finance the
> hardware.

 superb.  feel free to contact me off-list, with an address and
telephone number i can put on the EMS TW Postal Service docket.

l.

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[Arm-netbook] Interested in pre-production unit for GNU Guix

2017-11-22 Thread Eric Bavier 
Hello lkcl,

(Resending to list, hopefully it makes it this time)

We have a GNU Guix developer who is interested in working on bootloader
and general software support in GuixSD for the EOMA68-A20.

If there is still a pre-production unit available, please get in touch
so we can work out how to get them set up.  I've agreed to finance the
hardware.

Thanks,
`~Eric Bavier
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