Re: Rebuilding a kernel with olpc-kernel-builder
On Wed, Nov 17, 2010 at 12:49 PM, Chris Ball wrote: > Haven't seen that before. I've only used olpc-kernel-builder > for 2.6.35+ kernels. 2.6.31 kernels are still built using > http://dev.laptop.org/git/users/dsaxena/olpc-2.6-rpm/.git/ That's probably my problem. Thanks - 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
Re: XO-1.5 audio input DC mode
Sascha This matches what Walter and I are observing with TurtleArt 103. TA uses commands issued to amixer, amixer seems to be behaving inconsistently. Biases of 5k and 15k have been observed but unpredictably. The amixer commands that should switch the bias off just change the gain. With 0dB gain, bias off commands, the output is +26000 0V, 0, 1.7V, -26000 3.4V. Try to switch off the bias and the gain changes to +-14000. I am using the tip of a stereo plug which I thought was the right channel? Tony > Hi! > > I'm trying to use the XO-1.5 as an oscilloscope, using xoscope (*) [1]. > I thought that should be easy to do given that the audio input seems to > be specifically designed to do something like this. However my experiences > so far are strange at best... > > For a start there always is a bias voltage. I can reduce its impedance > from ~ 15kΩ to ~ 5kΩ and increase it from ~1.75V to ~2.5V, but never turn > it off. > > I also don't understand the values I am seeing: It's always oscillating > with half the sampling rate. The Capture level seems to affect both the > base line and a partitioning into several value ranges. E.g. for level > 39 (-43dB), I get a waveform growing downward from 100 and apparently > proportional to the input voltage for 0-1.65V, a jump to an waveform > that starts at 100, but gets smaller as I further increase the voltage > and at about 1.9V it grows downward again (from 100) until at about > 3.3V it reaches a maximum (values 103 and -104). > > This is for the left channel (hooked up to a 5kΩ potentiometer acting as > a voltage divider for 5V from a PC power supply) - the right one behaves > even more strangely. Maybe it's been left floating (no pun intended)? > > It would be nice if somebody could explain how the XO-1.5 audio input > is wired up exactly. A simplified schematic would be awesome (AIUI Quanta > has the "IP rights" for the schematic, but a simplified version should > be fine I think). > > Sascha > > (*) X11 OscilloSCOPE. No relationship with the hardware. :) > [1] http://xoscope.sourceforge.net/ > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/ > ___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > > _ > This mail has been virus scanned by Australia On Line > see http://www.australiaonline.net.au/mailscanning ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1.5 audio input DC mode
On Wed, Nov 17, 2010 at 2:46 PM, C. Scott Ananian wrote: > As a wild stab at a first guess, it sounds like a software problem to > me -- seems like xoscope is not successfully turning off either the > bias voltage or the decoupling capacitor (high pass filter). Perhaps > a silent failure of some sort? If you've got access to a signal generator (or another machine with a sound card), feeding in a 1kHz square wave with an offset (say 0 off, 1V on) is probably a better diagnostic than using your potentiometer. If my wild guess is correct, then you should see a characteristically rounded square wave with no offset. Then you could poke at the software until (a) the rounding goes away, and (b) you see the offset you expect, which would indicate that the decoupling capacitor has successfully been switched out of the circuit. --scott -- ( http://cscott.net/ ) ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1.5 audio input DC mode
As a wild stab at a first guess, it sounds like a software problem to me -- seems like xoscope is not successfully turning off either the bias voltage or the decoupling capacitor (high pass filter). Perhaps a silent failure of some sort? --scott -- ( http://cscott.net/ ) ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1.5 audio input DC mode
On Wed, Nov 17, 2010 at 1:38 PM, Sascha Silbe wrote: > Hi! > > I'm trying to use the XO-1.5 as an oscilloscope, using xoscope (*) [1]. > I thought that should be easy to do given that the audio input seems to > be specifically designed to do something like this. However my experiences > so far are strange at best... > > For a start there always is a bias voltage. I can reduce its impedance > from ~ 15kΩ to ~ 5kΩ and increase it from ~1.75V to ~2.5V, but never turn > it off. > > I also don't understand the values I am seeing: It's always oscillating > with half the sampling rate. The Capture level seems to affect both the > base line and a partitioning into several value ranges. E.g. for level > 39 (-43dB), I get a waveform growing downward from 100 and apparently > proportional to the input voltage for 0-1.65V, a jump to an waveform > that starts at 100, but gets smaller as I further increase the voltage > and at about 1.9V it grows downward again (from 100) until at about > 3.3V it reaches a maximum (values 103 and -104). > > This is for the left channel (hooked up to a 5kΩ potentiometer acting as > a voltage divider for 5V from a PC power supply) - the right one behaves > even more strangely. Maybe it's been left floating (no pun intended)? > > It would be nice if somebody could explain how the XO-1.5 audio input > is wired up exactly. A simplified schematic would be awesome (AIUI Quanta > has the "IP rights" for the schematic, but a simplified version should > be fine I think). > > Sascha > > (*) X11 OscilloSCOPE. No relationship with the hardware. :) > [1] http://xoscope.sourceforge.net/ > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/ > > ___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > > With whatever you learn, maybe you can help me sort out the remaining issues with the Sugar Oscilloscpe (Measure) activity (http://activities.sugarlabs.org/en-US/sugar/addon/4197). Meanwhile, this thread may be of interest: http://lists.laptop.org/pipermail/devel/2010-November/030326.html -walter -- Walter Bender Sugar Labs http://www.sugarlabs.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
XO-1.5 audio input DC mode
Hi! I'm trying to use the XO-1.5 as an oscilloscope, using xoscope (*) [1]. I thought that should be easy to do given that the audio input seems to be specifically designed to do something like this. However my experiences so far are strange at best... For a start there always is a bias voltage. I can reduce its impedance from ~ 15kΩ to ~ 5kΩ and increase it from ~1.75V to ~2.5V, but never turn it off. I also don't understand the values I am seeing: It's always oscillating with half the sampling rate. The Capture level seems to affect both the base line and a partitioning into several value ranges. E.g. for level 39 (-43dB), I get a waveform growing downward from 100 and apparently proportional to the input voltage for 0-1.65V, a jump to an waveform that starts at 100, but gets smaller as I further increase the voltage and at about 1.9V it grows downward again (from 100) until at about 3.3V it reaches a maximum (values 103 and -104). This is for the left channel (hooked up to a 5kΩ potentiometer acting as a voltage divider for 5V from a PC power supply) - the right one behaves even more strangely. Maybe it's been left floating (no pun intended)? It would be nice if somebody could explain how the XO-1.5 audio input is wired up exactly. A simplified schematic would be awesome (AIUI Quanta has the "IP rights" for the schematic, but a simplified version should be fine I think). Sascha (*) X11 OscilloSCOPE. No relationship with the hardware. :) [1] http://xoscope.sourceforge.net/ -- http://sascha.silbe.org/ http://www.infra-silbe.de/ signature.asc Description: PGP signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Upgrading a _very_ old OLPC
sameer wrote: > Krishnan is local to SF. We'll help him get upgraded. be sure and verify what hardware he has before starting. build 417 is pretty old, and could represent a pre-B3, or whatever the oldest machine still installable with current s/w is. paul > > Sameer > > > On Wed, Nov 17, 2010 at 1:16 AM, C. Scott Ananian wrote: > > -- Forwarded message -- > > From: Krishnan R.S. > > Date: Wed, Nov 17, 2010 at 2:48 AM > > Subject: Upgrading a _very_ old OLPC > > To: csc...@laptop.org > > > > > > Hello, > >I managed to get my hands on a very old OLPC XO laptop for my > > daughter. I've been trying, unsuccessfully, to upgrade the OS to > > something current. The main issues are: > > > > My image has no olpc-update > > I tried to follow the wiki instruction to update olpc-update - alas > > that leads to more issues about missing python2.5 > > I tried to install python using apt/deb/dpkg but all of these fail > > since the apt/deb/dpkg tools are missing :( > > Looking at /etc/issue - I see build 417 - and some messages that look > > like errors "kernel \r \m " :) so maybe I have a pre-alpha build > > :) > > > > So ... I'm somewhat at a loss as to what my next steps are. My > > daughter seems pretty excited with the device and enjoys the "paint" > > application. I'd like to get a more recent build so she can use the > > newer apps/toos. > > Can you point me in the right direction ? Or am I wasting my time > > trying to do the impossible? > > Thanks, > > Krishnan > > +1-415-606-3069 > > -- > > Krishnan Subramaniam > > rskrish...@hotmail.com > > > > > > > > > > -- > > ( http://cscott.net/ ) > > ___ > > 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 =- paul fox, p...@laptop.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Upgrading a _very_ old OLPC
On 11/17/2010 06:53 PM, Sameer Verma wrote: > Krishnan is local to SF. We'll help him get upgraded. > > Sameer Depending on the data you want to save, you might just save the content of home (Jounal) and reflash the machine with the current stable build (and then copy that stuff back in). Cheers, Simon ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Upgrading a _very_ old OLPC
Krishnan is local to SF. We'll help him get upgraded. Sameer On Wed, Nov 17, 2010 at 1:16 AM, C. Scott Ananian wrote: > -- Forwarded message -- > From: Krishnan R.S. > Date: Wed, Nov 17, 2010 at 2:48 AM > Subject: Upgrading a _very_ old OLPC > To: csc...@laptop.org > > > Hello, > I managed to get my hands on a very old OLPC XO laptop for my > daughter. I've been trying, unsuccessfully, to upgrade the OS to > something current. The main issues are: > > My image has no olpc-update > I tried to follow the wiki instruction to update olpc-update - alas > that leads to more issues about missing python2.5 > I tried to install python using apt/deb/dpkg but all of these fail > since the apt/deb/dpkg tools are missing :( > Looking at /etc/issue - I see build 417 - and some messages that look > like errors "kernel \r \m " :) so maybe I have a pre-alpha build > :) > > So ... I'm somewhat at a loss as to what my next steps are. My > daughter seems pretty excited with the device and enjoys the "paint" > application. I'd like to get a more recent build so she can use the > newer apps/toos. > Can you point me in the right direction ? Or am I wasting my time > trying to do the impossible? > Thanks, > Krishnan > +1-415-606-3069 > -- > Krishnan Subramaniam > rskrish...@hotmail.com > > > > > -- > ( http://cscott.net/ ) > ___ > 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: Rebuilding a kernel with olpc-kernel-builder
Hi, > The script in the SPEC file gets in an unwhole tangle with > directories and symlinks. I honestly cannot figure out WTH it > doing. make -s mrproper dies with getcwd errors (as per log > attached). Haven't seen that before. I've only used olpc-kernel-builder for 2.6.35+ kernels. 2.6.31 kernels are still built using http://dev.laptop.org/git/users/dsaxena/olpc-2.6-rpm/.git/ - Chris. -- Chris Ball One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Rebuilding a kernel with olpc-kernel-builder
I am trying to rebuild our kernel with a couple of patches on top... - on a F11 build host, trying to build an XO-1.5 / F11 series kernel - cloned olpc-kernel-builder - fiddled with the paths to match my local setup - run and ... fail! The script in the SPEC file gets in an unwhole tangle with directories and symlinks. I honestly cannot figure out WTH it doing. make -s mrproper dies with getcwd errors (as per log attached). Any hints? 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 build.log Description: Binary data ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Fwd: Upgrading a _very_ old OLPC
-- Forwarded message -- From: Krishnan R.S. Date: Wed, Nov 17, 2010 at 2:48 AM Subject: Upgrading a _very_ old OLPC To: csc...@laptop.org Hello, I managed to get my hands on a very old OLPC XO laptop for my daughter. I've been trying, unsuccessfully, to upgrade the OS to something current. The main issues are: My image has no olpc-update I tried to follow the wiki instruction to update olpc-update - alas that leads to more issues about missing python2.5 I tried to install python using apt/deb/dpkg but all of these fail since the apt/deb/dpkg tools are missing :( Looking at /etc/issue - I see build 417 - and some messages that look like errors "kernel \r \m " :) so maybe I have a pre-alpha build :) So ... I'm somewhat at a loss as to what my next steps are. My daughter seems pretty excited with the device and enjoys the "paint" application. I'd like to get a more recent build so she can use the newer apps/toos. Can you point me in the right direction ? Or am I wasting my time trying to do the impossible? Thanks, Krishnan +1-415-606-3069 -- Krishnan Subramaniam rskrish...@hotmail.com -- ( http://cscott.net/ ) ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
