Pandaboard Support
David R. Lane (77) 760 posts |
@Rick |
Raik (463) 2058 posts |
Sorry is Kuemmel’s not mine! |
Rick Murray (539) 13764 posts |
I would say – completely off the top of my head and without an iota of anything resembling “proof” (this is the internet, after all) – that if your chip is a package-on-package (the RAM is on top of the CPU), that straying over 85C is “too much”. Not for the health of the processor, but more because things change shape slightly at different temperatures and a PoP design welds together two solid things at different temperatures. [this is why adding a heatsink is much less effective than forced air cooling (ie a fan) – a heatsink on top will be cooling the RAM, not the SoC] Last year, after lots of tests, the Pi foundation decided that the ~700MHz Pi could be overclocked up towards 1GHz safely so long as two conditions were met:
More on that here: http://www.raspberrypi.org/archives/2008
So they seem to think 85C is when it is getting too much. I’d prefer 75C just to be paranoid. BTW, that link above is worth reading just for the comment by the guy who misinterprets the overvolt value of ‘6’ (means ramping up the CPU power from 1.2V to 1.35V) as “need another 6 volts, where can I find an 11V power supply for my Pi?”. Eeeeeek! :-) :-) |
Rick Murray (539) 13764 posts |
The test is, of course, to fire up something computationally intensive and see how that affects the temperature. If it doesn’t rise much, stop worrying. ;-) Now while you might expect a rise – playing a 480P (SD!) H.264 video on my eeePC causes a jump from ~55C to ~68C (well, it is an Intel chipset!); yesterday I watched an episode of Red Data Girl (720P (HD!) H.264+subs) on the Pi with RaspXBMC and according to the on-screen temperature report (overlaid on top of the video), the temperature rose from ~48C to 51C. You gotta love the Pi to do it better and not even break into a sweat… ;-) How will your Panda fare? [though your post implies that something is keeping the CPU in fast mode as a matter of course?] |
Chris Hall (132) 3548 posts |
As at June 4th 2013: There are also at least 2 changes that haven’t made it into CVS yet. The Smartreflex driver (CPU runs much cooler) and the CJE Power control module support. (This solves the problem of shutdown/restart not working). I have tweaked !CPUTmpMon to show both processor speed and temperature (by adding the following lines to !RunImage) which will be useful once the SmartReflex driver makes it into CVS as I’ll be able to see the processor speed up and slow down as the SmartReflex driver operates:
I have also renamed my ‘MLO’ and used the ‘MLO1500’ instead. My Pandaboard ES is now running at 1500MHz and about 56°C. Otherwise I am running the RComp 32Gbyte dual-partition PandaLand SD card with RISC OS 5.19 (30-Sep-2012) which is the latest supported image (AIUI). |
Chris Hall (132) 3548 posts |
I have tried RISC OS 5.21 (03-Sep-2012) on my Pandaboard. The SmartReflex driver seems to switch between 350MHz and 1200MHz as you do more or less intensive tasks. I am using the MLO1500 (rather than the MLO1200) but the SmartReflex driver overrides this and seems to have 1200MHz as the fastest speed. However the processor runs much cooler. The new !Boot structure has confused !NewIconsX (the sprite name for the drive icon can live at FCxxxxxx and a $wimp%!32="Sname"+CHR$0 therefore fails with an abort, so I commented out that line of BASIC in the RunImage). Moving from 5.19 (30-Sep-2012) [the version from PandaLand] to 5.21 (03-Sep-2013) causes the sound to be much worse – rather than just getting the timing wrong, the pitch is now worse. It would be nice to get sound sorted out. I am using !SignalBox to test the sound (which uses sound scheduling to add future sounds). |
Malcolm Hussain-Gambles (1596) 811 posts |
I’ve found the SmartReflex driver causes my Pandaboard to crash, not immediately but it’s not stable enough to use :-( . Mine seems to crash also if I try and use non smart reflex with the MLO1500. |
Chris Hall (132) 3548 posts |
I used MLO1500 extensively with no crash. Also I have not had a crash with SmartReflex. |
David R. Lane (77) 760 posts |
My Pandaboard has an RTC card fitted with 3V button battery; but, if the time is set manually in ‘Time and Date’ configure, the time is not correct when Panda is next powered up. For one SD card running RISC OS 5.19 of 9/2/13, the time shown after boot up is the time at the last shutdown, while for another SD card running RISC OS 5.21 of 22/9/13, the time shown after boot up is for 1/1/00. :-(( |
Wouter Rademaker (458) 197 posts |
For a RTC card to work something needs to be changed https://www.riscosopen.org/wiki/documentation/show/HALDeviceSysPeri_RTC |
David R. Lane (77) 760 posts |
Thanks for this. Following the link at the bottom of that page, |
Jan Rinze (235) 368 posts |
Finally got RISC OS 5.21 running on my Panda. First impressions: On the bright side: |
Jan Rinze (235) 368 posts |
Hmm.. the dreaded ‘ambigious name’ has popped up when using a USBstick. apparently i need to reboot before i can use it again. Hmm.. the dreaded ‘ambigious name’ has popped up when using a USBstick. apparently i need to reboot before i can use it again. |
Chris Hall (132) 3548 posts |
Is there a guide to properly format a SDcard for use with SDFS. combining a Filecore partition and a fat32 for booting? Two options – download the Raspberry Pi RC11 SD card image and tweak the FAT partition contents to include MLO, riscos (OMAP4 version), etc. This gives 2Gbytes available to RISC OS. Otherwise buy a 32Gbyte Pandaland SD card from R-Comp (ready to go, 32Gbyte available to RISC OS, fast SD card). |
Jan Rinze (235) 368 posts |
SDcard formatting: The card i use is Sandisk 8GB Extreme III and does 20MB/s read 5.5MB/s write :-) just installed !NetSurf so i am typing this from the Panda. To get the network adapter recognized I needed to modify Autosense/EtherUSB into a Obey file with the string: Set InetSetup$Driver$USB EtherUSB:ej0:EtherUSB:0.26:EtherUSB And then configure as usual. :-) |
Jan Rinze (235) 368 posts |
!MoonFish and !SunFish are not doing as well as !smbserver for file sharing. Oh. Aemulor on the Panda! :-) Sweeeet!! |
Wouter Rademaker (458) 197 posts |
The Pandaboard ROMs have disappeared from https://www.riscosopen.org/content/downloads/other-zipfiles. Where can I find the most recent one? |
Malcolm Hussain-Gambles (1596) 811 posts |
I got smartreflex working fine now, it seems I’d borked my !Boot with duplicate files. |
Steve Revill (20) 1361 posts |
Yes, We had a query relating to licensing and decided the best option was to temporarily take down the OMAP4 build. Sorry. :( It’s pretty trivial so we hope normal service will be restored in the next few days (although attending the London Show means we can’t sort it out before next week). |
Wouter Rademaker (458) 197 posts |
Is https://www.riscosopen.org/viewer/revisions/logs?ident=1383093681-831331.html the licensing problem fix? Can normal service be restored? |
Chris Evans (457) 1614 posts |
I suspect that the changes were too late for last nights autobuild but will appear after tonight’s build. |
Rob Heaton (274) 515 posts |
Hopefully the OMAP4 builds will be back again soon. |
Jan Rinze (235) 368 posts |
@Rob: do you need a more recent ROM? i have built one from sources, 26 oct. |
Rob Heaton (274) 515 posts |
@Jan: Yes please! I don’t have a working RISC OS machine setup, so I can’t build my own at the moment. Any OMAP4 ROM would do, so I can get my Pandaboard ES setup again. My Email address is: rob at robheaton.co.uk Cheers! |
Jan Rinze (235) 368 posts |
@Rob. done. |