Carlos,
This was posted to the wrong list. Please post
questions about constructivist learning to IEAP
where people
who study education can provide a real answer.
wad
On Apr 12, 2010, at 9:40 PM, Carlos Nazareno wrote:
> Questions:
>
> A) Syntax vs. Algorithms
>
> Scenario 1:
> complex
On Apr 11, 2010, at 8:56 PM, James Cameron wrote:
> On Sun, Apr 11, 2010 at 08:51:01PM -0400, Martin Langhoff wrote:
>> But hey. Flash developers want Flash in it. It's gotta be good for
>> something.
>
> My guess is that it is handy for repurposing the system for
> entertainment usage. (I don'
On Apr 11, 2010, at 7:08 PM, Carlos Nazareno wrote:
> Hey Martin! JD also hooked us up with Tom Nguyen, product manager for
> the Flash Player and here's what Tom said:
>
> "Great to meet you. I actually recently graduated with an MA in
> Education from Stanford, where I spent a bit of time foc
On Apr 10, 2010, at 10:03 PM, Mikus Grinbergs wrote:
> Given that several times I had the lid closed for 45 minutes, and that
> the browser functioned normally as soon as I opened the lid -- I'm led
> to conclude that my unmodified B2 *did* support operation of the WLAN
> across suspend/resume.
The XO serial numbers are structured as follows
AABYWWS
AA - Area, where SH is QSMC (Shanghai), and CS is CSMC (Changshu)
B - Factory
Y - Last digit of year of production
WW - ISO week number of production
S - unique identifier (in hex)
Example:
SHF80801FA0
is a laptop made in Factory 6
I have been installing USB keyboards in a few XO-1.5s, and took
a recent opportunity to document the process:
http://wiki.laptop.org/go/XO_1.5_USB_Keyboard
Cheers,
wad
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On Mar 30, 2010, at 9:56 AM, Mikus Grinbergs wrote:
>> Is there a simple way from OFW (or ACPI) to restrict
>> the operating frequency of the processor in the XO-1.5
>> to be the lowest possible ?
>>
>> The relevant comment from a deployment was that they
>> can't use full speed XO-1.5 motherb
On Mar 30, 2010, at 2:48 AM, James Cameron wrote:
> They'd also notice the graphics performance differences, and that
> wouldn't be amenable to a simple fix.
Correct, and they would still get twice the memory and roughly
1.5 times the storage (JFFS2 is compressed).
What I didn't mention is that
Mitch,
Is there a simple way from OFW (or ACPI) to restrict
the operating frequency of the processor in the XO-1.5
to be the lowest possible ?
The relevant comment from a deployment was that they
can't use full speed XO-1.5 motherboards as replacements
for XO-1 motherboards. They think kids w
On Mar 25, 2010, at 5:19 PM, Tiago Marques wrote:
> On Thu, Mar 25, 2010 at 1:26 AM, Carlos Nazareno wrote:
> Oh dear. Googling HQTube ended up with the top 2 entries being porn
> sites :-/ I think something needs a project name change :)
>
> Indeed, hence the link in my e-mail, to avoid confus
er to provide them ?
wad
On Mar 16, 2010, at 9:49 AM, Sascha Silbe wrote:
> On Sun, May 31, 2009 at 12:23:37AM -0400, John Watlington wrote:
>
>> We are considering changing from a "wall wart" design to an "inline design",
>> for the following reasons: [...
On Mar 15, 2010, at 2:13 PM, German R S wrote:
> El 15/03/10 11:48, John Watlington escribió:
>>
>> On Mar 15, 2010, at 12:46 PM, German R S wrote:
>>
>>> El 13/03/10 21:47, Martin Langhoff escribió:
>>>> On Sat, Mar 13, 2010 at 12:02 PM, German R S
>
On Mar 15, 2010, at 12:46 PM, German R S wrote:
> El 13/03/10 21:47, Martin Langhoff escribió:
>> On Sat, Mar 13, 2010 at 12:02 PM, German R S
>> wrote:
>>> The problem in Nicaragua is that we have more than 0.1%, we think
>>> that the
>>> percentage is around 1%.
Please provide us with ser
Time to suspend may vary based on the SD card.
On Mar 14, 2010, at 8:43 PM, James Cameron wrote:
> I've just tested for this, and I can't reproduce the symptom you
> describe. Typing continuously is echoed continuously, in the Text
> Editor.
>
> If I stop typing for long enough, the power LED g
Hmm. I need to communicate more.
There have been a number of changes in the XO-1 keyboard
since production started.
First, the flex circuit layout was changed to fix a problem with
the CTRL/ALT keys (the spacing bump for those keys was inexplicably
slightly below the minimum reliably reproducea
On Mar 11, 2010, at 1:13 PM, Mikus Grinbergs wrote:
>>> XO-1.5 B2 (unmodified hardware). At ok prompt did 'flash u:
>>> \q3a35.rom';
>>> after restart did 'fs-update u:\os112.zd'. That failed (with a
>>> message
>>> about only 1 block being written).
>>
>> I've tested q3a35.rom with fs-updat
I've tested q3a35.rom with fs-update several times, with no problems.
You have to ensure that the firmware reflash actually occurred properly
before continuing.
I can also verify that q3a34.rom should NOT work for you.
It has serious fs-update problems and should not be used.
Cheers,
wad
On Mar
form factor but use USB as the interconnect.
We provide both USB and SDIO to the connector, but
only use SDIO.
Cheers,
wad
> On Mon, Mar 8, 2010 at 10:10 PM, John Watlington
> wrote:
>
> On Mar 7, 2010, at 10:24 PM, Tiago Marques wrote:
>
> Hi Wad,
>
> Been reading some
Please trac this, and try to provide a more verbose description.
It sounds interesting...
wad
On Mar 8, 2010, at 6:15 PM, Mikus Grinbergs wrote:
> Still has the problem (also seen in earlier q3a3_ versions) that
> when I
> power on with my USB hub plugged in, if I hold down the 'check' game
>
On Mar 8, 2010, at 6:52 PM, John Gilmore wrote:
>> Perhaps the suspend/sleep process should be disabled until the
>> laptop is
>> assigned a child's name and color preference on first boot. I find
>> sleep to
>> be more disorienting, as the screen is turned off (my laptop broke!)
>> and it
>>
On Mar 7, 2010, at 10:24 PM, Tiago Marques wrote:
> Hi Wad,
>
> Been reading some "lost" e-mails, sorry to be bumping this up.
>
> On Tue, Jan 26, 2010 at 10:35 PM, John Watlington
> wrote:
>
>> On Jan 27, 2010, at 12:17 AM, Luke Kenneth Casson Leighto
On Mar 8, 2010, at 12:05 AM, Mikus Grinbergs wrote:
>> Suspend happens after fifteen seconds of no UI interaction
>> (there are other criteria as well).
>
> What I was surprised by was that suspend occurred when I failed to
> type
> in ("UI interact" within its time limit) the name it prompted
Suspend happens after fifteen seconds of no UI interaction
(there are other criteria as well).
We are trying to ensure that this suspend is transparent to
the user.
Currently, screen dimming is "wrongly" tied to suspend (not sleep)
timing. This has recently been a subject of vigorous debate, a
Paul,
I checked and all the power supplies that should be needed
for wake-on-USB are present in XO-1.5. All ports may be powered
in suspend, if the Linux USB driver supports it.
The internal USB port (P4, which is present on the board at
R392/R393) used by the two mock-ups provides power con
Daniel,
That looks like a problem with one of the two column driver ICs.
Those are bonded directly to the glass, and can't be replaced ---
the entire screen should be replaced.
Chalk it up to infant mortality, and let us know if the percentage
of affected units exceeds 0.1%.
Thanks for the w
Ismael,
Please provide percentages, not adjectives like "BIG".
Uruguay has reported problems with the adapters in the past,
but the complaint was that the pins that plug into the wall outlet
were breaking off, not that the cords were breaking.
Regards,
John
On Jan 28, 2010, at 1:41 AM, ismae
On Jan 27, 2010, at 12:17 AM, Luke Kenneth Casson Leighton wrote:
> hi scott, thanks for joining in, here.
>
> On Tue, Jan 26, 2010 at 3:01 PM, C. Scott Ananian
> wrote:
>> Good luck with your SDR dreams. I think the most you can expect from
>> OLPC is that, *if* the 10 improbable things you
On Jan 26, 2010, at 6:46 PM, Luke Kenneth Casson Leighton wrote:
> (and i also specifically mentioned the gnu-radio project resources as
> being one option. there are a _lot_ of people who would be
> _extremely_ happy to not have to spend $750 on a USRP in order to do
> free software development
On Jan 26, 2010, at 4:58 AM, Luke Kenneth Casson Leighton wrote:
> On Mon, Jan 25, 2010 at 6:33 PM, wrote:
>>> the key questions to be asking are: in light of the massive volumes
>>> involved with OLPC XOs, is SDR worth pursuing, given all the
>>> development costs, but given all the benefits e
On Jan 26, 2010, at 2:07 AM, Luke Kenneth Casson Leighton wrote:
> On Mon, Jan 25, 2010 at 6:05 PM, Luke Kenneth Casson Leighton
> wrote:
>
>> the key questions to be asking are: in light of the massive volumes
>> involved with OLPC XOs, is SDR worth pursuing, given all the
>> development costs
Chris and Daniel are right. Doing this with SOHO APs is going
to be difficult - it would require over 25 APs.
You have moved into a area where you are probably better off
using high-priced (i.e. multiple antenna) APs, and a centralized
controller.
wad
On Jan 25, 2010, at 11:57 PM, da...@lan
We'll swap it out. We are very curious about such a young death.
wad
On Jan 19, 2010, at 12:47 PM, Rob Savoye wrote:
> I fired up my B2 XO 1.5 unit yesterday, the power light came on, then
> went off, and now it won't power up at all. The same power supply
> works
> fine with a G1G1 unit. I
Posted by Mikus on #9557:
> But given the amount of developer-mystification that has resulted
> from situations I observe,
> from now on I intend to publish only the most clear-cut errors I
> notice. If there happen to be
> actual problems behind ambiguous observations -- let it be others
>
On Dec 28, 2009, at 11:15 PM, Chris Ball wrote:
> Hi,
>
>> While #9927 is personally interesting to me, can I instead divert
>> your attention to the logs I just posted for #9865 ?
>
> Looks identical to the bug (#9702) with 3.3V not coming up fast enough
> to successfully resume the internal SD
On Dec 28, 2009, at 11:15 PM, Chris Ball wrote:
> Hi,
>
>> While #9927 is personally interesting to me, can I instead divert
>> your attention to the logs I just posted for #9865 ?
>
> Looks identical to the bug (#9702) with 3.3V not coming up fast enough
> to successfully resume the internal SD
Good intuition. That stopped the crashing...
On Dec 28, 2009, at 10:22 PM, James Cameron wrote:
> Have you tried with timeouts.timer_rtcwake set to zero yet?
>
> My current gut feel based on 9865_1.txt is that there is a race of
> sorts
> between rtcwake and the apparent removal of the block
While #9927 is personally interesting to me, can I instead
divert your attention to the logs I just posted for #9865 ?
Tmw. I will be in a position to verify this bug on a largish
number of C1 machines, and can hand off the poster child (prebuild #2)
to someone else.
I would blame hardware, but
On Dec 28, 2009, at 1:53 PM, Paul Fox wrote:
> martin wrote:
>> On Mon, Dec 28, 2009 at 7:25 PM, C. Scott Ananian
>> wrote:
>>> j/k. ;-)
>>
>> emacs is what I am using on both XO-1 and XO-1.5 so pretty good going
>> ;-) (Along with vim! Peace!)
>>
>> Lots of people here want to claim we need E
I just installed Fedora Eclipse on an XO-1.5 and launched it
under Gnome.Granted, I ran into #9927 (/var/cache/yum too small)...
Cheers,
wad
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On Dec 28, 2009, at 8:54 AM, NoiseEHC wrote:
> You can still create applications with
> http://code.google.com/p/android-scripting/
>
> With the existing tools it is true that children cannot create the
> same quality applications what is possible with the Android SDK
> environment (even if w
On Dec 27, 2009, at 5:52 PM, NoiseEHC wrote:
>
>> Does Android not host its development tools because it doesn't run
>> the
>> X Window System? Since X already runs on most of the hardware that
>> Android does, that wouldn't be too hard to remedy -- and would
>> benefit
>> the whole Android
We don't sell them, but I can send you a couple.
Please send a mailing address.
Cheers,
wad
On Dec 26, 2009, at 11:29 AM, vbx dev wrote:
> OLPC XO-1 uses the Marvell 88W8388 USB wireless adapter. I want to
> contribute to the development of the libertas/libertas-tf driver for
> this wireless ad
On Dec 24, 2009, at 6:59 AM, NoiseEHC wrote:
> ...
> debug. You know, Android OS solves exactly the same problems Sugar has
> been created to solve just it is faster, uses less memory, much
> prettier, has an usable developer environment...
Actually, I would argue that an operating system that d
f yes, would you please send me the pdf/doc file ASAP?
>
> ===
> Arthur Huang
> こう し めい
> 黃 志銘
> NB2 PM
> Quanta
> 886-3-327 2345 ext 12362
> China: 610934<= here
>150 2655 0362 <= here
> -Original Message-
> From: John Watlington [mailto
On Dec 23, 2009, at 9:33 PM, John Gilmore wrote:
>> I would take it all with a large dose of salt.
>
> Also, as usual, the left hand at OLPC doesn't know what the right hand
> is doing. The press release isn't on www.laptop.org, nor is there
> anything in www.laptop.org or wiki.laptop.org about
On Dec 19, 2009, at 10:45 AM, Tiago Marques wrote:
> Hi all,
>
> In an effort to migrate testing to a machine that resembles something
> like the C1, I would like to perform the WLAN ECO(s) on the B2 1.5.
> However, I found one for the B2 models and another for the B3:
>
> http://wiki.laptop.org/
Turns out my mail to on Wednesday night was a little optimistic.
On Thursday, we dug deeper into a self-test failure
that we had all noticed but it hadn't been a high priority.
It turns out that a series of errors were causing the lid
switch in most XO-1.5 (B2-C1) laptops to "flap". We had
left
Greetings from cloudy Shanghai!We are completing the
XO-1.5 C1 bringup at QSMC, and it is going OK.
Mitch Bradley, Richard Smith and Paul Fox spent the last two
and a half weeks working on getting the manufacturing tests
integrated into Open Firmware. This both gives us more
control over th
#9865 illustrates the danger in telling all of our testers
to disable automatic suspend/resume. I would prefer
that testers leave suspend/resume enabled, and give
up their wireless.
Suspend/resume has seen very little testing!
Cheers,
wad
On Dec 11, 2009, at 8:11 PM, James Cameron wrote:
> O
Saw the IRC log from the bug triage meeting.
Is anyone really testing using an OS greater > OS54 ?
It happens readily on a B2 (if you enable suspend/resume).
The only way this one isn't a blocker is if we disable
suspend/resume by default.
Richard and I both see this hang our machine multiple
ti
On Dec 8, 2009, at 1:04 AM, James Cameron wrote:
> On Mon, Dec 07, 2009 at 09:04:52PM -0500, Reuben K. Caron wrote:
>> If randomly set, how do we avoid channel overlaps and interference.
>
> OpenFirmware has a method to detect channel use and avoid it, and
> it is
> used in the NANDblaster featu
On Dec 7, 2009, at 9:04 PM, Reuben K. Caron wrote:
> Daniel,
>
> Since we've run into problems with creating ad-hocs networks on the XO
> 1.5 (1) (2), I've been thinking about this functionality, the change
> in UI behavior and perhaps the decrease in usability and I don't like
> it. I believe it
Chris,
She probably has a machine with OS31 on it. I doubt
olpc-update will work until she upgrades via OFW first.
wad
On Dec 6, 2009, at 5:03 PM, Chris Ball wrote:
> Hi Caryl,
>
>> First, I don't know how to tell if the machine is secured or not.
>
> It's definitely unsecured.
>
>> As a
The second test was similar:
XO-1: 9h 5m
XO-1.5: 12h 40m
On Dec 3, 2009, at 11:52 AM, John Watlington wrote:
> I'll be repeating this test, but the first pass was encouraging.
> The battery life when the laptop is suspended (but running
> the backlight and the WLAN) of an XO-1
There is an infrequent problem with the XO-1.5 B2
prototypes where they may not power-up properly.
This would be indicated by the EC rapidly flashing
the battery LED red. It then tries to power up the
laptop again, frequenly succeeding. This will
appear as a flash or two of the red battery LE
I'll be repeating this test, but the first pass was encouraging.
The battery life when the laptop is suspended (but running
the backlight and the WLAN) of an XO-1 and an XO-1.5 were
compared.
The XO-1 lasted 10h 20m.
The XO-1.5 lasted 12h 15m.
WLAN wakeups were disabled on the XO-1 to even the p
Just a reminder that it is easy to use fs-update on external SD cards as
well as the internal one. You just first have to type:
devalias fsdisk /sd/d...@1:0
Cheers,
wad
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I would prefer to see the backlight dimming take place on a longer
time scale (as Paul says, I'm frequently still reading when it happens)
and the suspend happening much more aggressively.
Does OHM have user configurable knobs ?
Cheers,
wad
On Nov 30, 2009, at 8:00 PM, Paul Fox wrote:
> chris
On Nov 29, 2009, at 1:21 PM, Tiago Marques wrote:
> On Sun, Nov 29, 2009 at 5:53 PM, Chris Ball wrote:
>> Hi,
>>
>> >> You can also disable it using My Settings -> Power -> Automatic
>> >> power management.
>>
>> (Cool, I didn't think that would work yet! But it does.)
>
> I also confirm th
Be aware that the test.sh script tends to be destructive to the device.
If a device is close to failing (which is when you start seeing
a larger number of errors), they will push it over the edge quickly.
Some less reliable cards fail after as little as 900 GB written.
Cheers,
wad
On Nov 28, 20
The bias for port B is used for port F (the DC input).
Port F has no bias generator, and would have to use
another port's, regardless of whether it was DC coupled or not.
wad
On Nov 26, 2009, at 7:18 AM, Daniel Drake wrote:
> Hi,
>
> On XO-1, we had an ALSA switch that enabled mic bias. This wa
Sending out the latest boot options chart.
The change is that MEM_ID0 is now used to indicate
whether the memory chips used require CL3 or CL4 timing.
Regards,
wad
BootOptions.pdf
Description: Adobe PDF document
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It is a bug. Please trac it.
On Nov 25, 2009, at 7:18 AM, Christoph Derndorfer wrote:
> Hi all,
>
> I just noticed that even after a night of charging an XO-1.5 the
> power LED is still orange and hasn't switched to green (as it did
> with the XO-1 when the battery was fully charged).
>
>
I like how the uncompressed .img file for os45 is only 200MB.
Perhaps it isn't complete ?
I checked, and neither os44 or os43 provided a .img version.
Cheers,
wad
On Nov 24, 2009, at 6:21 PM, Chris Ball wrote:
> http://wiki.laptop.org/go/F11_for_1.5
> http://dev.laptop.org/~cjb/f11-1.5/os45
>
Trac it.
No, we have seen nothing that leads us to believe that we have
memory corruption problems w. B2s. Software errors are a much
more likely cause.
wad
On Nov 23, 2009, at 6:56 PM, Tiago Marques wrote:
> On Mon, Nov 23, 2009 at 7:19 PM, John Watlington
> wrote:
>>
>&g
On Nov 23, 2009, at 1:55 PM, Tiago Marques wrote:
> On Sun, Nov 22, 2009 at 8:01 PM, Mitch Bradley wrote:
>> Tiago Marques wrote:
>>>
>>> Hi,
>>>
>>> The hardware page for the XO 1.5 doesn't show the clockspeed of the
>>> RAM chips used. CAS 3 looks like very aggressive timings for cheap
>>> DDR
On Nov 22, 2009, at 4:02 PM, LASKE, Lionel (C2S) wrote:
>
>
> Hi all,
>
>
>
> OLPC France has organized a XO repair workshop on November 19th at /
> tmp/lab near Paris.
>
> Detail report is on: http://olpc-france.org/wiki/index.php?
> title=Compte-rendu_atelier_r%C3%A9paration_19/11/2009
>
>
>
I suggest that we dedicate the unused
memory ID 0 jumper (GPIO9) to indicate that
this DRAM is present.
Thanks for reminding me, as Richard and I
wanted to add another jumper since we've used
them all up.
wad
On Nov 20, 2009, at 2:51 AM, Mitch Bradley wrote:
> I have a B3 with 1 GiB of memory,
This is a call for help on getting suspend/resume working
on the XO-1.5.
By removing the libertas (WLAN) drivers (both from the loaded modules
and the
filesystem), OS42 can finally suspend/resume with some success on B2s.
Instructions on how to test this are at:
http://wiki.laptop.org/go/XO1.5_
As 1.5 and other portable devices are using SD as their main storage:
What is a removable volume ?
On Nov 18, 2009, at 1:10 AM, Mikus Grinbergs wrote:
> I have the subdirectories for some Activities installed on my
> "permanent" SD card (it's in the "external" slot of my XO-1.5).
> Os42 is not m
On Nov 11, 2009, at 3:04 PM, Hal Murray wrote:
> Has anything interesting changed in this area for XO-1.5?
YES!
XO-1.5 no longer uses any USB devices internally. We used
SDIO instead. This not only provides lower power operation
to start with, it also should allow us to suspend/resume much
Thank very much for this report.
Please trac serious problems!
Comments inline,
wad
On Nov 15, 2009, at 2:51 PM, Tiago Marques wrote:
> Hi all,
> Here's some data I collected:
>
> Firmware Q3A13-Q3A15:
> -
> OS30:
> hdparm -t /dev/mmcb
Good catch, Ben!
In fact, I don't think either the XO-1 or XO-1.5 needs to sync
before suspend.Maybe before a sleep, but not an aggressive
suspend.
A more vexing problem is not cutting SD power until it has
finished completing its write. To address that problem, I
propose trac #9692.
Chee
There is no reason to believe that form factor is the crucial
difference.
I see variation between manufacturers and device class, with little
correlation to size (full size vs. micro).
Your full size Sandisk is likely to be an extreme III (class 6) versus
the class 2 OEM version that we use in
We already tried running the SD interface at half speed to reduce
power dissipation. It runs at full speed by default.
wad
On Nov 17, 2009, at 12:49 PM, Peter Robinson wrote:
> Hi Daniel,
>
>> Today I tried to figure out why running "sync" often takes 5-10
>> seconds
>> or longer. This slow
On Nov 14, 2009, at 5:51 PM, Tiago Marques wrote:
> Hi John,
>
> On Sat, Nov 14, 2009 at 3:18 PM, John Watlington
> wrote:
>>
>> ...
>> There are several changes from B2:
>> ...
>> - use of QMI WLAN module (instead of AzureWave). The WLAN card
>
We received 15 XO-1.5 B3 motherboards Friday, straight from the
assembly line.
Five of them have been packaged in CL1A cases for 1CC developers, and
another
5 are running tests on the sawzall testbed (outside the tech room).
There are several changes from B2:
- change in SDIO slot assignment
Yep. There is a lot of overhead, and there are also limitation in
the connection between the host
and the network interface. You should upgrade to a newer OS image,
however, You want to have
the latest libertas firmware (this may not improve the performance,
but it makes your results mo
More details at:
http://wiki.laptop.org/go/XO1.5_Power_ECO
Cheers,
wad
On Nov 10, 2009, at 6:07 PM, Richard A. Smith wrote:
> Some testing in Uruguay has uncovered that the 25W power limit in
> B2's internal DC/DC converter is not functioning correctly.
>
> The result is that if you _heavily_
Damn. I'm always the last to know
On Nov 3, 2009, at 10:51 AM, Benjamin M. Schwartz wrote:
> The ever entertaining Prof. Negroponte surpasses all expectations
> in his
> latest performance:
>
> http://www.xconomy.com/boston/2009/11/02/negroponte-outlines-the-
> future-of-olpc-hints-at-pa
If you think you might be having troubles with overheating
on your XO-1.5, the heat spreader is suspect. After removal
(to change the SD, check out the motherboard, etc)
and sometimes even before then, the heat spreader doesn't
make good contact with the VX855 and the CPU.
I suggest bending the
I had one machine (w. old touchpad) which absolutely refused to
acknowledge the ESC key. But I could trigger a self-test using the
left-most gamepad key, and the keyboard was definitely working.
I finally got it to enter OFW by touching the mousepad briefly
before pressing the escape key.
You c
On Oct 9, 2009, at 8:11 AM, Paul Fox wrote:
> john wrote:
>>
>> I'm proposing a new GPIO map for XO-1.5 B3 and beyond.
>>
>> The changes are:
>> - Moved the control signals for the internal and external SD ports
>> and the WLAN around to match new port assignment.
>>
>> - The power control for
Chris, Mitch,
I would like to wire up GPIO2, otherwise known as MSDT, to control
power to SDIO slot #2 (WLAN) after an ECO. The ECO will be one
trace cut and one blue wire.
I don't know where in the plumbing this should happen (a quirk in the SD
stack, allowing it's reuse in B3 ?) but I bel
We have to reassign the SD ports on the XO-1.5, due to a newly
discovered
problem with the predefined power control pin for slot 2.
We have two "devices", the WLAN and the external SD slot, where we might
want to maintain power throughout suspend. These will be assigned to
ports 1 and 0 respect
Coincident with the industry-wide change to managed Flash is the change
to smaller transistors and storing multiple data bits per cell (MLC,
vs. SLC or
single bit per cell). This has brought a huge increase in error
rates, and a
decrease in reliability and erase cycle lifetime.
The bad news
On Oct 6, 2009, at 4:55 AM, Tiago Marques wrote:
> Hi John,
>
> On Tue, Oct 6, 2009 at 6:45 AM, John Watlington
> wrote:
>>
>> On Oct 3, 2009, at 12:16 PM, Tiago Marques wrote:
>>
>>> On Sat, Oct 3, 2009 at 4:19 PM, Ed McNierney wrote:
>>>
On Oct 3, 2009, at 12:16 PM, Tiago Marques wrote:
> On Sat, Oct 3, 2009 at 4:19 PM, Ed McNierney wrote:
>> Tiago -
>>
>> Well, everyone gets to contribute something to thermal problems :-)
Actually, the average heat sources are (in descending order): the
companion
chip (graphics engine, memor
On Oct 5, 2009, at 11:56 AM, Peter Robinson wrote:
> On Mon, Oct 5, 2009 at 4:44 PM, Martin Langhoff
> wrote:
>> On Mon, Oct 5, 2009 at 5:27 PM, Chris Ball wrote:
>>> I don't think there's much we can use Dave's advice for given the
>>> choice of microSD.
The fact that Woodhouse is right doesn'
Mitch,
Regarding your note on IRC about power adapters:
no, I hadn't noticed any problems with using XO-1
adapters with XO-1.5 laptops.
There are various flavors of XO-1 adapters, in 15 and 17W
flavors, from multiple vendors. At B2 bringup we had problems
with a prototype they had lying aro
When Quanta finally started the build at 7PM on Wed. they
discovered two problems:
A - zcat to one of the three candidate microSD cards were taking
four to six times longer than it should have.
B - The units were powering off occasionally when turning on
the WLAN card.
They had to stop producti
The XO-1.5 bringup is proceeding smoothly.
At this time, Mitch is working on streamlining the
production test process and integrating the production test
code into Open Firmware and our Linux releases. This will
eliminate the need for OLPC to continuously support
Quanta's separate production tes
On Aug 24, 2009, at 1:03 PM, Sebastian Silva wrote:
> Pareciera ser que estamos en una situación de violación de la
> licencia...
>
> Una pregunta, deduzco entonces que OLPC no está a cargo de
> entregar las claves de desarrollador para las XO que están en Perú -
> me pregunto:
Las maquinas Per
A small number of XO 1.5 B1 boards have arrived and are in hardware
testing.
The Quanta team, working in secret, decided that the B-phase risk was
too high to do in a single run and built a B1 motherboard. The
availability
of plastic for B-phase was delayed due to complications from minor
m
On Aug 6, 2009, at 10:12 PM, Richard A. Smith wrote:
> Benjamin M. Schwartz wrote:
>
>> Richard A. Smith wrote:
>>> In the end we chose to use microSDHC cards.
>>
>> For MP, will they be soldered down or on contacts?
>
> PCB mount cell phone style connector. You can change the card but you
> hav
The context is that we are trying to ensure that an Maximum Power
Point Tracking algorithm
can be implemented on the DC power input of the XO-1.5.
On Aug 5, 2009, at 10:56 PM, Richard A. Smith wrote:
> John Watlington wrote:
>
>> The problem comes from the need for the algorithm t
This week showed a steady progress toward a B1 motherboard.
The layout process with a six layer motherboard is going good
and being finalized. Gerbers should go out any day.
I had a brief scare for a couple of days when an SD card used for
testing developed errors (one in 1MB written, on average
The A2 wiki page has been updated (new photo and info):
http://wiki.laptop.org/go/XO_1.5_A2
The good news is that we have a solution for the occasional SD errors!
Details at: http://wiki.laptop.org/go/XO1.5_SD_card_ECO
I have a good circuit modification which enables 500K+ suspend/resume
cycle
We have often discussed the need for an audio DCON.
It wouldn't take much -- the amount of memory required
for a second of playback/record could be included in
the codec.
wad
On Jul 20, 2009, at 4:41 PM, Richard A. Smith wrote:
> Benjamin M. Schwartz wrote:
>
>>
>> To handle unpredictable inter
On Jul 20, 2009, at 12:37 AM, Richard A. Smith wrote:
> Carlos Nazareno wrote:
>
>> Also, what determines the dynamic clock rate from 400MHz to 1GHz? Is
>> this auto-scaling on demand like with the old AMD Athlon64's? Does
>> the
>> software automatically reduce speed to 400MHz when the unit is
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