Raspberry Pi Forums

patrickhwood

<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 ...

patrickhwood

<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/...

patrickhwood

<t>Vindicator said: ... 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. I would bet not: most DRAM current draw comes from the pin drivers and row activity. Also, parts of memor...

patrickhwood

<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...

patrickhwood

<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...

patrickhwood

<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...

patrickhwood

<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 ...

patrickhwood

<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. Ext2fs, ext3 and ext4 actually refer to ...

patrickhwood

That was announced a couple of days ago in the run up to CES. It uses the same Broadcom SoC as the RPi.

patrickhwood

<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...

patrickhwood

WiMax? I think you mean WiDi.

patrickhwood

<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. 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...

patrickhwood

<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. Of course, to run the UI framework, you'll need a touch screen or some way of emulating multitouch with a mou...

patrickhwood

<r>Quote from Svartalf on September 1, 2011, 05:18 Quote from patrickhwood on September 1, 2011, 01:13 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). In the c...

patrickhwood

<t>Quote from hajj_3 on August 28, 2011, 11:09 when do the FAT32 and NTFS patents end, isn't there a 14yr limit to patents or something then they become invalid? 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...

patrickhwood

<t>Hmmm, let's do a little math: 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...

patrickhwood

<r>You should be able to get most of the code you need from the dd-wrt CFE, which is based on this: <URL url="http://www.linux-mips.org/wiki.....nvironment">http://www.linux-mips.org/wiki.....nvironment</URL> See also: <URL url="http://www.dd-wrt.com/phpBB2/v.....hp?t=25971">ht...

patrickhwood

<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...

patrickhwood

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).

patrickhwood

<t>Quote from Lob0426 on August 28, 2011, 18:43 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...

patrickhwood

<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 ...

patrickhwood

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?

patrickhwood

<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...

patrickhwood

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.

patrickhwood

My guess is that he wants to use a separate dongle to do the firewall/dhcp so it can be used with any router/AP, rather than attempting to find a dd-wrt port for every box in the field (not possible, of course).

Search found 26 matches

Re: WiFi Adapter Support

Re: Power for USB external 2.5" harddisk

Re: Power for USB external 2.5" harddisk

Re: Linux Drivers

Re: How to protect the filesystem without a save shutdown button?

Re: Teaching Programming - How will it all work?

Re: supercomputer

Re: Fragmentation

Re: Raspberry Pi as HDMI Dongle

Re: Best first language choice

Re: Raspberry Pi as HDMI Dongle

Re: Model A/B SD cross compatibility

Re: WebOS

Re: Porting programs from x86 to ARM

Re: FAT32 for SDCard and Patent Threat

Re: Additional RAM from USB?

Re: Router with integrated Raspberry Pi.

Re: Assembly Optimization

Re: Porting programs from x86 to ARM

Re: Router with integrated Raspberry Pi.

Re: Raspberry Pi + arduino + opencv

Re: File and/or media server

Re: File and/or media server

Re: Sonic screwdriver

Re: Firewall/DHCP aka router (Difficulty: Novice->Moderate)