#touchbook IRC Log

Index

IRC Log for 2010-06-30

Timestamps are in GMT/BST.

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[8:54] <tommd> gregoiregentil: Thanks, running that kernel now.
[9:02] <tommd> Patched kernel and running it again!
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[9:33] <gregoiregentil> good. What's the size of kernel before and after patching?
[9:47] <tommd> Oh, basically the same - (6.5 MB) my patches only export more symbols, not adding any new code.
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[11:12] <tommd> gregoriegentil: I was previously running 2.6.32 console-only (neuvoo). Just tried with Ubuntu (X.org server + either xmonad or xfce) and the x.org doesn't stay visible for more than a minute. Should I file a bug or are you on this already?
[11:12] <tommd> Not sure if filing bugs against a not-yet-released kernel is something you want.
[11:15] <tommd> The dmesg is rather interesting:
[11:15] <tommd> "Unable to handle kernel paging request at virtual address ....."
[11:15] <tommd> And I get a kernel oops.
[11:16] <tommd> Eventually I see four "Unhandled fault: external abort on non-linefetch (0x1018) at 0x40345000"
[11:17] <tommd> Those faults are different between when I run Ubuntu/X.org (they are there) and running Neuvoo/console only (the faults don't come up). The kernel OOPS is there in both setups.
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[12:17] <tommd> Is there a simple script to collect the .ko modules from a kernel build into an appropriate tarball?
[12:21] <Mrkva> tommd: tar cf modules.tar /lib/modules/$version ? :)
[12:21] <tommd> Mrkva: Yes, so that would require me to install them locally first.
[12:22] <tommd> I just figured the kernel devs would have made a direct way, but it doesn't look like it.
[12:22] <Mrkva> tommd: so, you mean from the kernel tree?
[12:22] <Mrkva> *kernel source tree
[12:22] <tommd> yes, something like "make modules-tarball" but the makefile lacks any such target
[12:22] <tommd> Seeing as I don't want/need arm modules installed on my dev box.
[12:25] <Mrkva> make INSTALL_MOD_PATH=/some/directory modules_install
[12:26] <Mrkva> and modules will be installed to /some/directory/lib/modules/ instead of /lib/modules/
[12:28] <tommd> thanks!
[12:29] <Mrkva> :)
[12:29] <Mrkva> no problem :)
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[15:25] <tommd> Can anyone tell me about the state of FCSE in the ai kernel? I've grepped though the patches and don't see it mentioned, but that's not proof it isn't there.
[15:26] <Corsac> fcse?
[15:26] <Corsac> what's that?
[15:30] <tommd> Corsac: fcse = Fast Context Switch Extension
[15:31] <Corsac> no idea then :)
[15:31] <tommd> I.E. using ARMs tagged TLB to speed up context switches
[15:32] <tommd> I'm getting 80uS for a context switch, so I'm guessing it isn't part of the ai-kernel.
[15:33] <tommd> I'd expect more like 20uS per switch if it were in there.
[15:33] <Corsac> is it upstream?
[15:33] <tommd> No
[15:33] <tommd> But Android uses it.
[15:33] <Corsac> and?
[15:33] <tommd> Another largish os, can't recall which.
[15:33] <tommd> It will probably be upstream eventually.
[15:34] <tommd> Perhaps its in .32 - I'm testing my benchmarks with .29 right now.
[15:34] <Corsac> well, if it's an android patch, I'm not that sure, considering how well android is pushed :/
[15:34] <Corsac> hmhm, though, the .29 kernel had some android patches
[15:34] <Corsac> (but it was for android 1.6, and maybe not everything was there)
[15:34] <tommd> It wasn't developed specifically for android.
[15:35] <tommd> lwn.net/images/conf/rtlws11/papers/proc/p01.pdf
[15:35] <tommd> pdf warning
[15:35] <Mrkva> tommd: I guess you don't have to warn about pdfs when there's a clean .pdf in the nam
[15:35] <Mrkva> e
[15:35] <tommd> Mrkva: Just trying to be polite
[15:35] <tommd> :-)
[15:35] <Corsac> seems deprecated in armv6 though, replaced by something like ???context id register??? ?
[15:36] <tommd> Same concept
[15:36] <tommd> It isn't going away.
[15:36] <Corsac> yeah but it's still deprecated :)(
[15:36] <Corsac> :)
[15:36] <tommd> The overall idea is there - just not in the form of FCSE.
[15:36] <tommd> That's the main point.
[15:37] <Corsac> yeah but maybe that means grepping on fcse won't give anything :)
[15:37] <tommd> true
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[21:02] <javaJake> Where is the documentation on how to compile 2.6.32?
[21:12] <gregoiregentil> http://www.alwaysinnovating.com/wiki/index.php/Kernel_compilation
[21:18] <tommd> javaJake: In Neuvoo it seems ok, but in Ubuntu I haven't been able to keep the screen from flaking out / flicking off.
[21:18] <tommd> There's about 1 minute of uses time in ubuntu before the screen blanks for me.
[21:20] <tommd> javajake: And sorry about the lack of testing - this 2.6.32 business has ment no wifi, which means I haven't emerged Xorg yet on my neuvoo.
[21:21] <tommd> (no wifi just because I didn't copy the modules over yet INSTALL_MOD_PATH didn't work right off and I haven't looked at why)
[21:29] <javaJake> Oh, no worries!
[21:29] <javaJake> I was just getting information because 2.6.29 was the last stable as far as I was aware
[21:30] <javaJake> tommd: stage5 should already have X?
[21:30] <tommd> Oh? Huh... let me look then.
[21:30] <tommd> 2.6.29 is still the current stable.
[21:30] <tommd> I play with 2.6.32 off and on.
[21:31] <javaJake> gregoiregentil: are there 2.6.32 patchfiles anywhere?
[21:31] <tommd> there are patches for it on the git
[21:31] <javaJake> gregoiregentil: even better if you have a git repo
[21:31] <tommd> git.alwaysinnovating.com
[21:31] <javaJake> Wonderful :)
[21:31] <gregoiregentil> Applied to the sources mentioned on the wiki page
[21:31] <tommd> see the ai.openembedded.dev
[21:31] <gregoiregentil> or available in OE git
[21:32] <gregoiregentil> http://git.alwaysinnovating.com/cgit.cgi/ai.openembedded.dev/tree/recipes/linux/linux-omap-psp-2.6.32/omap3-touchbook
[21:32] <tommd> javajake: so the sources mentioned was (I believe) because I kept complaining that the git repo wouldn't build properly for me - eventually GG set up this tarball.
[21:32] <javaJake> OK
[21:33] <javaJake> Interestingly enough, when I booted the beagleboard with a touchbook kernel, some beagleboard features, like LEDs, actually worked :P
[21:33] <javaJake> So the sooner you guys merge with linux-omap the better ;)
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