Search found 27 matches
- Tue Apr 14, 2020 5:12 pm
- Forum: OpenGLES
- Topic: glmark2-es2-drm slow on Pi4
- Replies: 2
- Views: 1249
glmark2-es2-drm slow on Pi4
I posted this in the raspbian forum, but it's really an OpenGLES question. Apologies to anyone who's already see it. Since glmark2 isn't in the raspbian apt repositories and the drm version in the ubuntu repo crashes, I pulled it down from git and built glmark2-es2 and glmark2-es2-drm. Overall glmar...
- Thu Apr 12, 2012 8:27 pm
- Forum: General discussion
- Topic: WiFi Adapter Support
- Replies: 33
- Views: 14501
Re: WiFi Adapter Support
<t>I've been using these USB devices with x86 and ARM linux for a couple of months now. They're very nice and have good range for such a small device. The drivers are standard in linux 3.x kernels (e.g., the beaglebone), but not 2.x kernels, at least up to 2.6.38, so I also had to build it on the ...
- Sat Mar 24, 2012 5:36 am
- Forum: General discussion
- Topic: Power for USB external 2.5" harddisk
- Replies: 25
- Views: 7521
Re: Power for USB external 2.5" harddisk
<t>Oh, I should also note that depending on the DRAM part, if the rows are wider, read and write operations are usually spaced further apart to dissipate heat properly, so total current draw over a microsecond or so of memory activity probably won't be much different between the two parts.<br/> <br/...
- Sat Mar 24, 2012 5:27 am
- Forum: General discussion
- Topic: Power for USB external 2.5" harddisk
- Replies: 25
- Views: 7521
Re: Power for USB external 2.5" harddisk
<t>Vindicator said: <br/> <br/> ...<br/> Also now that the model A has more memory that should mean it will consume more than the stated 300ma (maybe 400ma now) not sure.<br/> <br/> <br/> <br/> I would bet not: most DRAM current draw comes from the pin drivers and row activity. Also, parts of memor...
- Mon Feb 27, 2012 6:08 pm
- Forum: General discussion
- Topic: Linux Drivers
- Replies: 7
- Views: 2729
Re: Linux Drivers
<t>A lot of simpler devices (e.g., keyboards and mice) use standardized protocols over USB, so new drivers aren't necessary. Wifi dongles are a different matter. As new chipsets come out, new drivers are sometimes needed. When buying something like this, I make sure that linux drivers are availab...
- Tue Jan 17, 2012 12:32 am
- Forum: General discussion
- Topic: How to protect the filesystem without a save shutdown button?
- Replies: 61
- Views: 30805
Re: How to protect the filesystem without a save shutdown button?
<t>Yeah, most of the journaling file systems (like ext3) are very robust. I have yet to see one trashed by a reset, unplug of a USB drive w/o unmounting, etc., whereas I've seen a few FAT32 file systems destroyed this way. In fact, I have yet to see an ext3 file system ever need anything recovered...
- Thu Jan 12, 2012 10:38 pm
- Forum: Staffroom, classroom and projects
- Topic: Teaching Programming - How will it all work?
- Replies: 25
- Views: 9183
Re: Teaching Programming - How will it all work?
<t>Of you could use the laptops to connect to the RPis. If you have the ethernet-enabled RPis, you can use ssh or telnet and avoid using keyboards/monitors. If the laptops have USB ports, there's probably a way to plug them into a usb hub along with the RPi and get them to talk (sounds like a prog...
- Thu Jan 12, 2012 6:34 pm
- Forum: Other projects
- Topic: supercomputer
- Replies: 6
- Views: 4229
Re: supercomputer
<r>Actually, you should take a look at the FAWN (Fast Array of Wimpy Nodes) project at Carnegie Mellon University (<URL url="http://www.cs.cmu.edu/~fawnproj">http://www.cs.cmu.edu/~fawnproj</URL>). Their first project was a cluster of 21 500 MHz embedded boards connected via ethernet over consumer ...
- Thu Jan 12, 2012 6:10 pm
- Forum: General discussion
- Topic: Fragmentation
- Replies: 34
- Views: 9247
Re: Fragmentation
<t>Actually, you won't need to install anything to use FAT32 file systems, as this is very common across most linux systems, certainly all the ones that have been mentioned for the RPi. You may or may not need to install packages for NTFS, though.<br/> <br/> Ext2fs, ext3 and ext4 actually refer to ...
- Tue Jan 10, 2012 8:21 pm
- Forum: Other projects
- Topic: Raspberry Pi as HDMI Dongle
- Replies: 10
- Views: 10204
Re: Raspberry Pi as HDMI Dongle
That was announced a couple of days ago in the run up to CES. It uses the same Broadcom SoC as the RPi.
- Tue Jan 10, 2012 8:18 pm
- Forum: General programming discussion
- Topic: Best first language choice
- Replies: 140
- Views: 39180
Re: Best first language choice
<t>Unless you plan on doing a lot of web page development, I wouldn't start with JavaScript, as it requires more infrastructure to set up just to start writing simple programs. I'd start with something that either has an integrated IDE or an interpreted console mode so you can focus on learning how...
- Tue Jan 10, 2012 8:12 pm
- Forum: Other projects
- Topic: Raspberry Pi as HDMI Dongle
- Replies: 10
- Views: 10204
Re: Raspberry Pi as HDMI Dongle
WiMax? I think you mean WiDi.
- Fri Jan 06, 2012 7:15 pm
- Forum: General discussion
- Topic: Model A/B SD cross compatibility
- Replies: 5
- Views: 2192
Re: Model A/B SD cross compatibility
<t>My guess is that the same kernel will run on both boards. This has certainly been the case with other ARM-based boards with multiple memory configurations.<br/> <br/> If that's not the case, then you can wait for a uboot port, then use that to chain load the kernel, passing appropriate arguments...
- Fri Dec 09, 2011 10:32 pm
- Forum: Other projects
- Topic: WebOS
- Replies: 12
- Views: 3655
Re: WebOS
<t>WebOS, like Android, runs on a slightly customized linux kernel. The kernel mods for WebOS have always been available from Palm/HP; the WebOS UI framework has not -- until now.<br/> <br/> Of course, to run the UI framework, you'll need a touch screen or some way of emulating multitouch with a mou...
- Fri Sep 02, 2011 3:44 am
- Forum: Other projects
- Topic: Porting programs from x86 to ARM
- Replies: 8
- Views: 10175
Re: Porting programs from x86 to ARM
<r>Quote from Svartalf on September 1, 2011, 05:18<br/> Quote from patrickhwood on September 1, 2011, 01:13<br/> Well then, let's not forget endian-ness and sizeof(long), as long as we're talking portability (at least sizeof(int) hasn't been 2 for a long time on anything useful).<br/> <br/> In the c...
- Thu Sep 01, 2011 3:38 am
- Forum: General discussion
- Topic: FAT32 for SDCard and Patent Threat
- Replies: 18
- Views: 6790
Re: FAT32 for SDCard and Patent Threat
<t>Quote from hajj_3 on August 28, 2011, 11:09<br/> when do the FAT32 and NTFS patents end, isn't there a 14yr limit to patents or something then they become invalid?<br/> Used to be 17 years from the time of issue; now it's 20 years from the time of filing (minus any delays in the patent office sit...
- Thu Sep 01, 2011 3:25 am
- Forum: General discussion
- Topic: Additional RAM from USB?
- Replies: 30
- Views: 10892
Re: Additional RAM from USB?
<t>Hmmm, let's do a little math:<br/> <br/> For a 1GB swap partition, if we assume 100% write usage at 10MB/sec for one year, we get just over 300K GB of data, or ~300K write cycles. This is in the range (100k to 1m erase cycles) for most current flash devices. Now note that this assumes your system...
- Thu Sep 01, 2011 1:16 am
- Forum: Other projects
- Topic: Router with integrated Raspberry Pi.
- Replies: 45
- Views: 13643
Re: Router with integrated Raspberry Pi.
<r>You should be able to get most of the code you need from the dd-wrt CFE, which is based on this:<br/> <br/> <URL url="http://www.linux-mips.org/wiki.....nvironment">http://www.linux-mips.org/wiki.....nvironment</URL><br/> <br/> See also: <URL url="http://www.dd-wrt.com/phpBB2/v.....hp?t=25971">ht...
- Thu Sep 01, 2011 1:01 am
- Forum: Other projects
- Topic: Assembly Optimization
- Replies: 8
- Views: 3175
Re: Assembly Optimization
<t>The problem with the GPU being closed source is that there are many problems that are not display related that are handled by GPU hardware better than a general-purpose CPU like the ARM. You only have to look at CUDA and OpenCL for some examples of this. Similarly, lots of "media accelerators" no...
- Thu Sep 01, 2011 12:13 am
- Forum: Other projects
- Topic: Porting programs from x86 to ARM
- Replies: 8
- Views: 10175
Re: Porting programs from x86 to ARM
Well then, let's not forget endian-ness and sizeof(long), as long as we're talking portability (at least sizeof(int) hasn't been 2 for a long time on anything useful).
- Thu Sep 01, 2011 12:04 am
- Forum: Other projects
- Topic: Router with integrated Raspberry Pi.
- Replies: 45
- Views: 13643
Re: Router with integrated Raspberry Pi.
<t>Quote from Lob0426 on August 28, 2011, 18:43<br/> OK time for a little of the theoretical here. If you could replace the routers FLASH with DRAM, my theory is that you could use the RasPi to write to DRAM each time the router boots. You could then boot it with an image of client mode or a Site Su...
- Wed Aug 31, 2011 11:44 pm
- Forum: Other projects
- Topic: Raspberry Pi + arduino + opencv
- Replies: 14
- Views: 7283
Re: Raspberry Pi + arduino + opencv
<t>It's unclear whether a 700MHz ARM can run the OpenCV code fast enough for what you want to do. Most of this code is not optimized for any sort of GPU, even if you had access to the low level APIs for programming the Broadcom's GPU. Does anyone know whether there's any sort of SIMD support on the ...
- Wed Aug 31, 2011 11:33 pm
- Forum: Other projects
- Topic: File and/or media server
- Replies: 75
- Views: 24424
Re: File and/or media server
And back to the original idea -- what about a local NAS to cloud server? Something that talks to box.net storage or amazon S3 and shares that locally over samba?
- Wed Aug 31, 2011 11:32 pm
- Forum: Other projects
- Topic: File and/or media server
- Replies: 75
- Views: 24424
Re: File and/or media server
<t>We run a commercial RAID5 system at our office for network storage (Samba & NFS). There's a hot spare in the box, and if a disk dies, it emails the admin to make sure we replace it so we still have a hot spare. It'll prompt on a new drive that's too small as a hot spare, either letting us put...
- Wed Aug 31, 2011 11:17 pm
- Forum: General discussion
- Topic: Sonic screwdriver
- Replies: 10
- Views: 2303
Re: Sonic screwdriver
How about an original series communicator -- incoming message sound effects at random times and random comm clips from the show when you open it? All you'd need is a small speaker hooked up to the audio out and a connector between the flip-top and one of the switches.