Re: XO-1 cpu temperature [Devel Digest, Vol 71, Issue 43]
On 01/23/2012 02:56 AM, Yioryos Asprobounitis wrote: The thing is that XO-1.5 has about twice the XO-1 processing power and is quite usable. So getting another 50%+ out of the XO-1 (albeit with risks) may keep it in stride with the new software versions a bit longer. Of course I do realize that this should have nothing to do with OLPC, thus the vague questions ;) It won't work that way. Although in some cases you can increase the clock frequency a bit and have it still function the system is designed to run at the specified frequency. We didn't use parts that were rated for 1Ghz and then dial it down. We used the highest speed parts that we could get in our cost range and designed for that operating frequency. But may be all this is irrelevant now as pushing the XO-1 to 600MHz (extrapolating from these guys) results in kernel panics and/or errors. If this is because of the protection mechanisms I would appreciate if someone lets me know off-list (I promise not to tell) of a possible way around it. Its not a protection mechanism. Its because one of the system buses is corrupted because its being forced to operate above its design rating. A thermal shutdown will be a hang since the clock to the CPU is stopped. The thermal shutdown is not configurable and you can't bypass it. -- Richard A. Smith rich...@laptop.org One Laptop per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1 cpu temperature [Devel Digest, Vol 71, Issue 43]
if you don't feel like hunting down the correct
block device on the linux side
But there __is__ no block device defined by the 12.1.0 operating system
when running on the XO-1. { Raw /dev/ubi0, whose partition contains the
root file system, is defined as a character device. } I don't want to
get into making my own major and minor inode numbers, etc., etc.
[ I normally don't run Gnome. When I now switched over to Gnome -- it
saw the same devices (and only those devices) as when running Sugar. ]
you can probably edit it from OFW
I will liken finding out OFW capabilities (and commands) to pulling
hen's teeth. When I inquired in 2008, the answer was read the code.
Still haven't gotten around to doing that.
Thank you for responding, mikus
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Re: XO-1 cpu temperature [Devel Digest, Vol 71, Issue 43]
On Mon, Jan 23, 2012 at 6:03 PM, Mikus Grinbergs mi...@bga.com wrote: I will liken finding out OFW capabilities (and commands) to pulling hen's teeth. When I inquired in 2008, the answer was read the code. Still haven't gotten around to doing that. And then January 2012 came, and some lunatic gave you an exact command to type! Man, that's so different! Maybe it even works -- now that'd be a change! ;-) m -- martin.langh...@gmail.com mar...@laptop.org -- Software Architect - OLPC - 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 cpu temperature [Devel Digest, Vol 71, Issue 43]
Access to the jffs2 boot partition of the XO-1 NAND Flash is required for any kernel upgrade ... so having it missing should be breaking olpc-update. I expect this will need to be fixed during development of 12.1.0, and when it is fixed your access to the boot partition should be easier. It isn't a matter of hunting down a correct block device. I don't think there should be any block devices for the XO-1 NAND Flash ... they will be mtd or character devices. We did have mtdblock by mistake once, fixed in #11234. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1 cpu temperature [Devel Digest, Vol 71, Issue 43]
On 01/23/2012 04:20 PM, Mikus Grinbergs wrote: Please (I'm trying to ask nicely!), can you all tell me what I need to tweak to make customizing the olpc.fth (plus run 'rpm -U kernel...') be effective on 12.1.0. [ I know how to make them work on 11.3.0. ] Ah.. I misunderstood you. When you said device I thought you were referring a to an OFW device tree device, like the device that lets you do MSR access. I didn't realize you were talking about access to the boot partition. I could help you with a firmware issue but I'm afraid I can't help much with 12.1.0. The boot partition is supposed to be accessible via /bootpart/boot or /boot if its not then its just a bug that will get fixed up later. 12.1.0 is still in its infancy. I wouldn't expect much to work for quit a few more builds. Like Martin's e-mail suggested you can open 'olpc.fth' in a small editor under OFW. You can edit the file there and make your changes. No Linux involved. Although I'm not sure if that version of firmware can edit files on the bootpart correctly. There have recently been a bunch of fixes for OFW ext2/3/4 support. Alternatively you could decompress the os image file on a desktop machine, edit the file and then re-compress it. -- Richard A. Smith rich...@laptop.org One Laptop per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1 cpu temperature
On 01/21/2012 09:58 AM, Yioryos Asprobounitis wrote: I was wondering if there is anyway to monitor the geode temperature on the XO-1. I would like to test how far I can push it without ruining it. The CPU is protected by a thermal shutdown circuit it will shutdown before you cause any thermal damage. Unless you are trying hardware modifications I doubt you will do anything worse than these guys. http://www.olpcnews.com/forum/index.php?topic=2389.0 What exact are you going to try and push? -- Richard A. Smith rich...@laptop.org One Laptop per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: XO-1 cpu temperature [Devel Digest, Vol 71, Issue 43]
I was wondering if there is anyway to monitor the geode temperature on the XO-1. I would like to test how far I can push it without ruining it. The CPU is protected by a thermal shutdown circuit it will shutdown before you cause any thermal damage. Unless you are trying hardware modifications I doubt you will do anything worse than these guys. http://www.olpcnews.com/forum/index.php?topic=2389.0 What exact are you going to try and push? -- Richard A. Smith rich...@laptop.org One Laptop per Child Something worse than these guys! ;) With the XO-1 being EOL some time now and the ones in the field aging some dangerous playing might not be unthinkable. As you know kids are notorious for not playing safe... The thing is that XO-1.5 has about twice the XO-1 processing power and is quite usable. So getting another 50%+ out of the XO-1 (albeit with risks) may keep it in stride with the new software versions a bit longer. Of course I do realize that this should have nothing to do with OLPC, thus the vague questions ;) But may be all this is irrelevant now as pushing the XO-1 to 600MHz (extrapolating from these guys) results in kernel panics and/or errors. If this is because of the protection mechanisms I would appreciate if someone lets me know off-list (I promise not to tell) of a possible way around it. Thanks ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
XO-1 cpu temperature
I was wondering if there is anyway to monitor the geode temperature on the XO-1. I would like to test how far I can push it without ruining it. Could not find the relevant info anywhere but I think I have seen at some point that this may not be possible (due to limited connections?). Is it possible? Thanks ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
