Re: Does antitheft.py in olpcrd ever do anything?
On Tue, May 5, 2009 at 6:24 AM, C. Scott Ananian csc...@laptop.org wrote: the plan is to implement real EC-based security for Gen 1.5; I recommend ditching the init-based plan completely Any hints or references for that I could read? Or should I talk w Richard? I'd like to make sure I implement something that works also on 1.5... m -- martin.langh...@gmail.com mar...@laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
ffreep support on Geode LX (XO-1)
Hi! While trying to use sugar-jhbuild on DebXO (Debian on XO-1), I encountered several programs that crashed with SIGILL, apparently during execution of ffreep. While the AMD Athlon Processor x86 Code Optimization Guide [1] claims that although insufficiently documented in the past, [ffreep] is supported by all 32-bit x86 processors, the AMD Geode LX datasheet [2] doesn't list ffreep. As ffreep was added to gcc 3.4 [3] and Build 801 seems to use 4.3.0, I'm wondering whether it has been patched/configured in some way to avoid this issue or whether the processor actually supports it and something else on my machine is broken. [1] http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/22007.pdf [2] http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33234d_lx_ds.pdf [3] http://gcc.gnu.org/ml/gcc-patches/2002-11/msg01386.html CU Sascha -- http://sascha.silbe.org/ http://www.infra-silbe.de/ signature.asc Description: Digital signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
OLPC Volunteer Infrastructure Group Meeting: [Now]
The Volunteer Infrastructure Group (/gang) Meeting is today (May 5th) at 4pm (EST) The Volunteer Infrastructure Group is a team of Volunteer Sysadmins who help maintain services and systems around OLPC and the OLPC/SugarLabs community. The weekly VIG meeting is an excellent chance to get involved, or to be aware of upcoming projects. http://wiki.laptop.org/go/OLPC:Volunteer_Infrastructure_Group http://vig.laptop.org/wiki/index.php/User:Dogi http://idea.laptop.org/ideatorrent/ideatorrent/vig/ http://embed.mibbit.com/?server=irc.oftc.netchannel=%23olpc-adminsettings=12a698505c860f99a6ad1051c57975f9noServerTab=falsenoServerNotices=truenoServerMotd=truenick=Guest Meeting Details: Date: May 5th, 2009 Time: 16:00 EST Location: irc.oftc.net #olpc-admin ciao dogi ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Ambient light sensing via LED response
Hallo, C. Scott Ananian wrote: snip A last resort would be hooking up a MOSFET as a simple amplifier -- again, you're not worried about linearity or any such niceties, but you'd still need a good match for your MOSFET's threshold voltage... some real measurements to replace the WAGes would go a long way. --scott measured on a B1 XO1 laptop (where the leds and the series resistor are wired in parallel it seam) : almost dark: 0mv ~3meter away from a 8w PL; bare led: ~2mv ~50 cm below ~25W halogen desk lamp; bare led: ~40mv bright white led directly on bare led ~200mv bright white led directly on light guide of the bat.led (lcd side) ~50mv ~50 cm below ~25w halogen desk lamp (~75* angle to the axis of the light guide) ~5mv i measure this between GND of the laptop the led side of the series resistor. all leds seam to be about the same.. i did not compare the different light guides. the main battery and DC power where removed, the RTC baterry was still in place. the meter i measured this with was fixed in the 2000mv range and was abou 10Mohm when i connected it to another meter in resistance mode; the (volt) meter read 250mv at that time. adding a 10Mohm resistor across the meter halved the ~50 cm below ~25W halogen desk lamp; bare led: ~40mv reading to ~20mv strangely enough when i add that resistor in series the meter said ~60mv so voltage on the leds must have been ~120mv? i will have to investigate this at a later time... if you want more measurement doen feel free to ask.. i also have a XO1 (production model ?C1?) that i could measure. i dont have a lux meter :-( Greetings, Reinder ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Battery recovery issues
Emiliano Pastorino wrote: bat-charge reports this: 320.83 mAh (7d53) 1428.12 mA (2ddc) 6.492 V (195c) Chg: 0.41mAh ( 29) then every column raises line to line (I copied that by hand because bat-charge-log always says Can't open file, even when usb stick is plugged in. Turns out the way I did the disk devices won't work unless you either: 1) boot with a usb drive plugged in 2) run 'p2' before bat-debug-log 'p2' will re-probe usb devices. If the first column is battery's charge, then it's almost dry. Should I try bat-recover or charge it the usual way? The first column is the ACR reading and you can't tell anything by just 1 reading. You have to know what it was when you started discharging or charging. I don't report SOC in that listing cause generally I don't care. I want to know what it does after I turn on charge rather than what level it was at previously. bat-charge simply enables charging and then starts reading the battery directly. Thus it does not care about any of the settings in the EEPROM. Its a good diag tool to see if the battery just physically won't take charge or if you just can't communicate to it at all. If bat-charge works but normal charging does not then its EC or EEPROM badness. The LFP batteries have an overvoltage cutoff that will protect them so its ok to just turn one on and leave it. For NiMH you would end up reducing its life. But since you don't have any NiMH you don't care. 'bat-recover' works by PWMing the charge pin to keep the charge current very low and allow the cells to equalize yet not trip the over voltage like they would if you just turned on the charge and left it. The settings I've picked by default seem to work in most cases but I've had many batteries where I needed to reduce the current even further from the default settings. To speed up the process you can use normal charging methods to get the battery close to full (or wherever it cuts out at) That way the recover process will be much shorter. I'll try bat-recover with a bunch of batteries today, so maybe tomorrow or on Wednesday I'll be sending you some logs, if it is ok to you. After looking at your bat-debug log I've realize that the extra diagnostic info is only present in f-series firmwares with my newer EC code. I'm forwarding you an e-mail with a copy of q2f02 that I worked on while trying to solve some problems with batteries in another deployment. q2f02 will be behind q2e41 in terms of OFW but has EC code with extra battery diag info. For battery testing there should no difference between the 2. Its also available here: (Just never announced since a new e-series release happened right after) http://dev.laptop.org/pub/firmware/q2f02/ So install f02 on your test laptop and re-run bat-debug-log after you have first run 'p2' and the logging to disk should work. I don't need any more see-bstate info. so the steps: install f02 remove battery boot stop at ok insert usb drive (or boot with it inserted) run 'p2' run 'bat-debug-log' insert battery run for a couple of minutes then hit a key send me the log. I'll try to get a f03 out soon with the latest of everything but I've got gen 1.5 bring up tasks that I need to attend to. -- Richard Smith rich...@laptop.org One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Ambient light sensing via LED response
These measurements are really cool. But the question remains in whether the ADC could have a resolution of 1mv?, i mean in light of these measurements is necessary to have an ADC that can reliable sense these variations and then with that basis have a transfer function and add it to the algorithm. (haven't checked the specs though..) My two cents..;). Rafael Ortiz On Tue, May 5, 2009 at 3:24 PM, Reinder de Haan r...@mveas.com wrote: Hallo, C. Scott Ananian wrote: snip A last resort would be hooking up a MOSFET as a simple amplifier -- again, you're not worried about linearity or any such niceties, but you'd still need a good match for your MOSFET's threshold voltage... some real measurements to replace the WAGes would go a long way. --scott measured on a B1 XO1 laptop (where the leds and the series resistor are wired in parallel it seam) : almost dark: 0mv ~3meter away from a 8w PL; bare led: ~2mv ~50 cm below ~25W halogen desk lamp; bare led: ~40mv bright white led directly on bare led ~200mv bright white led directly on light guide of the bat.led (lcd side) ~50mv ~50 cm below ~25w halogen desk lamp (~75* angle to the axis of the light guide) ~5mv i measure this between GND of the laptop the led side of the series resistor. all leds seam to be about the same.. i did not compare the different light guides. the main battery and DC power where removed, the RTC baterry was still in place. the meter i measured this with was fixed in the 2000mv range and was abou 10Mohm when i connected it to another meter in resistance mode; the (volt) meter read 250mv at that time. adding a 10Mohm resistor across the meter halved the ~50 cm below ~25W halogen desk lamp; bare led: ~40mv reading to ~20mv strangely enough when i add that resistor in series the meter said ~60mv so voltage on the leds must have been ~120mv? i will have to investigate this at a later time... if you want more measurement doen feel free to ask.. i also have a XO1 (production model ?C1?) that i could measure. i dont have a lux meter :-( Greetings, Reinder ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: from Peru, sugar in DEBIAN
You can also try to download activities from activities.sugarlabs.org. Many will work without recomipiling, just by installing the packages within sugar. Since the debian package for Browse is broken you need to download the file with wget or from GNOME, etc. and then install it within sugar using the terminal activity using sugar-install-bundle. Cheers, Andrés On Sun, Apr 26, 2009 at 7:17 PM, OLPC Puno olpcp...@gmail.com wrote: My name is Sdenka from Puno Peru, since one month we are using Debian at Glorioso San Carlos High School in PERU. We installed the sugar and 10 activities including in Debian packages, then added ETOYS, SCRATCH AND LOGOTURTLE. I need the other activities' source code to compilate in Debian to use and test them with teenagers students this year. Our goal is testing and then use Debian in elementary school which didn't receive LAPTOP XO, but like to use the wonderful activities FOR EDUCATION. Thanks in advance for your reply, SDENKA ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Andrés ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Ambient light sensing via LED response
On May 5, 2009, at 6:44 PM, Rafael Enrique Ortiz Guerrero wrote: These measurements are really cool. But the question remains in whether the ADC could have a resolution of 1mv?, i mean in light of these measurements is necessary to have an ADC that can reliable sense these variations and then with that basis have a transfer function and add it to the algorithm. Absolutely not. The A/D is eight bits, with an input range spanning 0 - 3.3V, so the best you can hope for is about 13 mV per LSB. I would guess actual accuracy to be closer to 26 mV. But why do you say you would need 1 mV accuracy ? Bright sunlight is far stronger than the light sources he used. (haven't checked the specs though..) Having the data sheet for the EC controller doesn't help --- 8 bits and recommended operating voltage for the analog reference voltage is about all it provides. I had to ask a chinese speaker to call the app. engineer to find out the input impedance... My two cents..;). Rafael Ortiz On Tue, May 5, 2009 at 3:24 PM, Reinder de Haan r...@mveas.com wrote: Hallo, C. Scott Ananian wrote: snip A last resort would be hooking up a MOSFET as a simple amplifier -- again, you're not worried about linearity or any such niceties, but you'd still need a good match for your MOSFET's threshold voltage... some real measurements to replace the WAGes would go a long way. --scott measured on a B1 XO1 laptop (where the leds and the series resistor are wired in parallel it seam) : almost dark: 0mv ~3meter away from a 8w PL; bare led: ~2mv ~50 cm below ~25W halogen desk lamp; bare led: ~40mv bright white led directly on bare led ~200mv bright white led directly on light guide of the bat.led (lcd side) ~50mv ~50 cm below ~25w halogen desk lamp (~75* angle to the axis of the light guide) ~5mv i measure this between GND of the laptop the led side of the series resistor. all leds seam to be about the same.. i did not compare the different light guides. the main battery and DC power where removed, the RTC baterry was still in place. the meter i measured this with was fixed in the 2000mv range and was abou 10Mohm when i connected it to another meter in resistance mode; the (volt) meter read 250mv at that time. adding a 10Mohm resistor across the meter halved the ~50 cm below ~25W halogen desk lamp; bare led: ~40mv reading to ~20mv strangely enough when i add that resistor in series the meter said ~60mv so voltage on the leds must have been ~120mv? i will have to investigate this at a later time... if you want more measurement doen feel free to ask.. i also have a XO1 (production model ?C1?) that i could measure. i dont have a lux meter :-( Greetings, Reinder ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Ambient light sensing via LED response
On Tue, May 5, 2009 at 8:34 PM, John Watlington w...@laptop.org wrote: On May 5, 2009, at 6:44 PM, Rafael Enrique Ortiz Guerrero wrote: These measurements are really cool. But the question remains in whether the ADC could have a resolution of 1mv?, i mean in light of these measurements is necessary to have an ADC that can reliable sense these variations and then with that basis have a transfer function and add it to the algorithm. Absolutely not. The A/D is eight bits, with an input range spanning 0 - 3.3V, so the best you can hope for is about 13 mV per LSB. I would guess actual accuracy to be closer to 26 mV. But why do you say you would need 1 mV accuracy ? Bright sunlight is far stronger than the light sources he used. i don't know if the measurements at sunlight would show the same variations.. we would have to make new measurements, but for experience, the variations of voltage regarding light sensing are not of considerable amounts, so if the accuracy is 26mv, we would have to see if a perceptible change in ambient light could be of a higher magnitude than 26mv, if not the accuracy could be lost.. (haven't checked the specs though..) Having the data sheet for the EC controller doesn't help --- 8 bits and recommended operating voltage for the analog reference voltage is about all it provides. I had to ask a chinese speaker to call the app. engineer to find out the input impedance... Ok, thanks :). On Tue, May 5, 2009 at 3:24 PM, Reinder de Haan r...@mveas.com wrote: Hallo, C. Scott Ananian wrote: snip A last resort would be hooking up a MOSFET as a simple amplifier -- again, you're not worried about linearity or any such niceties, but you'd still need a good match for your MOSFET's threshold voltage... some real measurements to replace the WAGes would go a long way. --scott measured on a B1 XO1 laptop (where the leds and the series resistor are wired in parallel it seam) : almost dark: 0mv ~3meter away from a 8w PL; bare led: ~2mv ~50 cm below ~25W halogen desk lamp; bare led: ~40mv bright white led directly on bare led ~200mv bright white led directly on light guide of the bat.led (lcd side) ~50mv ~50 cm below ~25w halogen desk lamp (~75* angle to the axis of the light guide) ~5mv i measure this between GND of the laptop the led side of the series resistor. all leds seam to be about the same.. i did not compare the different light guides. the main battery and DC power where removed, the RTC baterry was still in place. the meter i measured this with was fixed in the 2000mv range and was abou 10Mohm when i connected it to another meter in resistance mode; the (volt) meter read 250mv at that time. adding a 10Mohm resistor across the meter halved the ~50 cm below ~25W halogen desk lamp; bare led: ~40mv reading to ~20mv strangely enough when i add that resistor in series the meter said ~60mv so voltage on the leds must have been ~120mv? i will have to investigate this at a later time... if you want more measurement doen feel free to ask.. i also have a XO1 (production model ?C1?) that i could measure. i dont have a lux meter :-( Greetings, Reinder ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Server-devel] backup : problem opening /library/users/XXXX/datastore-xxxxx/store
Sure thing. It's on its way to your inbox. Thanks !!! ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
