T Gillett | 20 Mar 21:57 2015
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XOs cannot act as WiFi access points

Some information here on devices we looked at as part of the VT project.

(scroll to the bottom of the page)

There are several Ralink chips used in these devices, but the RT3070 and RT5370 seem to be the most common and work quite well.
We tested some of these with 25 XOs connected concurrently.

Unfortunately, many of the devices available cheaply on eBay etc are not branded, and even the branded ones can change chipsets between batches. So you need to be a bit careful when buying.

We found that some devices (specifically some Atheros based units) have a hard limit (eg 8) set for the number of concurrent wifi connections they will support in AP mode. This is probably to guarantee correct operation and prevent overloading as seen in some commodity routers which start to drop connections when 10-15 client devices are attached. Something else to watch out for.

Some of the devices (eg Alfa Networks) have a metre or so of USB cable that allows you to mount the device away from the host, which can be useful to allow better wifi connections from clients eg outside the building.

Some devices have built in panel antennas that provide a useful 6-10dB of directional gain.

$0.02


Anyone know the best such cheap USB-insertable WiFi hotpot/AP to buy for
XOs?  Ralink-based presumably?

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James Cameron | 19 Mar 03:10 2015

Announcing OLPC OS 13.2.3 for XO-1.75 and XO-4

G'day,

We're pleased to announce the release of OLPC OS 13.2.3 for XO-1.75
and XO-4.

It is Sugar 0.104 on Fedora 18, with hardware enablement for ongoing
manufacturing and spare parts.

Details of new features, known issues, and how to download, install or
upgrade can be found in the release notes:

http://wiki.laptop.org/go/Release_notes/13.2.3

XO-4 users beware of the firmware upgrade - it must be done with care.

Many thanks to all contributors, testers, upstreams, and those who
have provided feedback of any kind.

Developers who need restricted software components, such as the Adobe
Flash plugin, GStreamer MP3 codecs, or vMeta hardware acceleration,
should contact me directly for assistance.

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James Cameron
http://quozl.linux.org.au/
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Bishnu Bidari | 17 Mar 07:15 2015

Sugar 0.100 camera problem

Hello Everyone,

We are using olpc os builder to build customized olpc os for XO-4. with following configuration

olpc os builder version 7.0
Build: 13.2.0
Firmware: q7b41
sugar: 0.100.0

In this build we noticed a problem on Record activity. In which only the microphone icon is present and hence no images and videos can be captured.
But while testing camera device from OK prompt it work fine. It looks like the OS is unable to detect the camera hardware.

We had also tried latest olpc image from http://download.laptop.org/xo-4/os/official/latest/32015o4.zd, which works fine.

Had anyone faced similar issues? What could be the cause and any solution?

Thanks in advance.

Thanks,
Bishnu


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Adam Holt | 17 Mar 03:06 2015

"XOs cannot act as WiFi access points"

Can someone remind me the reason that XO laptops (if I'm remembering correctly) cannot use their antennae/ears as a self-contained WiFi AP server?  (e.g. for tiny community/village libraries in very offline developing countries.  A very typical situation being: local librarian wants to use existing XO hardware, leaving a humble knowledge hotspot unpassworded and wide open to diverse WiFi devices, in the style of Internet-in-a-Box).

Is it a HW and/or SW (http://en.wikipedia.org/wiki/HostAP) that prevents this, out of curiosity?

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Gonzalo Odiard | 9 Mar 18:39 2015

Patents from Microsoft

Reading http://arstechnica.com/tech-policy/2015/03/microsoft-drops-patent-hammer-on-kyocera

The patents looks obvious, but in particular http://www.google.com/patents/US7137117
looks like something the XO already did.
Someone can present prior art?   

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peter | 6 Mar 03:07 2015
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Re (2): [Sugar-devel] Community OS 14.1.0 Version 2

From:	Samuel Greenfeld <samuel <at> greenfeld.org>
Date:	Thu, 5 Mar 2015 09:25:52 -0500
> ... re-build the XO-1 image with the additional SD card image tonight.

Just for interest, the complete FPGA based Oberon system is said 
to compile in under 10 s.  
http://en.wikipedia.org/wiki/Oberon_%28operating_system%29#Project_Oberon_.28FPGA.29

HTML interpretation is quite limited and there is no PDF viewer.  
Nevertheless, a genuine operating system with practical capabilities.

Regards,                           ... Peter E.

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tkkang | 5 Mar 13:43 2015

Re: Community OS 14.1.0 Version 2

+1 as I am in that category :-)

>-----Original Message-----
>From: James Cameron [mailto:quozl <at> laptop.org]
>Sent: Thursday, March 5, 2015 08:06 PM
>To: 'Samuel Greenfeld'
>Cc: 'OLPC Devel', sugar-devel <at> lists.sugarlabs.org
>Subject: Re: Community OS 14.1.0 Version 2
>
>On Thu, Mar 05, 2015 at 06:55:13AM -0500, Samuel Greenfeld wrote:
>> The updated images can be found at http://www.greenfeld.org/xo/community/
>> builds/14.1.0/build_2/
>
>I've heard there may be one or two microdeployments some interested in
>SD card builds on XO-1.  If you want to cover that, add the module
>[sd_card_image] to your .ini file.  Let me know if it is broken.
>
>-- 
>James Cameron
>http://quozl.linux.org.au/
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James Cameron | 4 Mar 05:45 2015

XO-4, cp(1) may stall using two loopback mounts

With our 3.5 kernel on XO-4, using olpc-os-builder, sometimes a cp
stalls in D state while using two loopback mounts backed by USB HDD.

It is easily fixed at the time using drop_caches.

Anyone got any ideas?

Seems to be independent of wireless device or hard drive.

http://dev.laptop.org/ticket/12864

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Yioryos Asprobounitis | 15 Feb 14:21 2015
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trying 41001qq

It is nice to see a new build for all the XOs after some time now.
Tried 41001qq at the ends of the spectrum my G1G1 XO-1 and a touch XO-4
Both worked and I even got them to collaborate on measure activity
On the XO-4 things are really nice and with the SMP kernel things are moving reasonably fast.
Sugar runs just fine and activities do not misbehave. 
Mate desktop is responsive albeit touch unfriendly. Not sure if anything could be done about it as I do not
think they have a touch-friendly theme or layout.
The default 10 point font is too big and 7 or 8 would be better.
Also the switch user option does nothing and should be probably hidden, as well as Xterm that is useless on
Mate. But these are minor tittle things to wary about.

On the XO-1, I would say simple do not build for this hardware.
It took me 3 tries and a long unexpected phonecall to actually boot in the XO-1, as in the first 2 tries after a
minute or 2 with a black (power management kicks in) or white screen, I was rebooting and checking that
everything was OK. 
It is just takes a very looooong time to get going. This is also true when starting activities as with most the
"fail to start" timeout kicks in before the activity has the chance to start. If you ignore it, the activity
eventually starts.
Adding a bit of swap did not improve things.
Looking at CPU usage it would appear that systemd-journal consumes anything from 35 to 55% of the CPU with
just 'top' running and the XO-1 is constantly on 3.0+ load average.
I do not know if systemd-journal can be turned off but would be desirable for XO-1 builds.
The other heavy CPU user (that I do not remember being the case in older builds) is Network
Manager/wpa_suplicant with ~20% each. 
Anyway, the build "works" on the XO-1 but with *a lot* of patience. 
So unless the new builds have this "killer/must have" feature, I wouldn't bother with XO-1 Fedora/Sugar builds.
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Yioryos Asprobounitis | 14 Feb 14:55 2015
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Firmware q7c04

Nice to see the list back up and running.
According to the info XO4 firmware q7c04 "support(s) booting legacy android kernel"
However both os32013a4 and 3214a4 fail to boot under q7c04.
Do they qualify as "legacy android kernel"?

BTW is there any official or community SMP android/sugar builds in the works?
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Jhon Diaz | 12 Feb 21:02 2015
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OLPC Ubuntu 14.04

Hi guys i got ubuntu 14.04 working sysvinit is not there so i compiled it and it works where should i update it if so who wants to test it - Thanks
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Gmane