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by Bakul Shah
Sat Nov 19, 2011 7:14 pm
Forum: Other projects
Topic: FreeBSD on Raspberry Pi
Replies: 22
Views: 9669

Re: FreeBSD on Raspberry Pi

<t>As simon says the issue is if you want to contribute your changes back to the upstream *BSD project. If you want to create your own source + binary distribution you can do so but then you are also going to have to merge further changes from the upstream project as the OS evolves -- a nontrivial a...
by Bakul Shah
Sat Nov 19, 2011 3:43 am
Forum: Other projects
Topic: FreeBSD on Raspberry Pi
Replies: 22
Views: 9669

Re: FreeBSD on Raspberry Pi

<r>Quote from Nexy on November 18, 2011, 19:46<br/> I appreciate that it would be best to BSD license the code too, but even if it's just GPL'd, that wouldn't stop us using GPL code altered to work under FreeBSD but still under the GPL license would it? <E>:?</E><br/> <br/> <br/> No, it won't. Once ...
by Bakul Shah
Fri Nov 18, 2011 11:00 am
Forum: Other projects
Topic: What software development environment...
Replies: 37
Views: 5936

Re: What software development environment...

<r>Assuming the final cards still has a 4 pin serial console, you can build your own serial cable and connect to your computer's serial port. If your computer doesn't have a serial port, that is when you need a FTDI based serial to usb adapter. When you hook it up to your computer, you will see a ne...
by Bakul Shah
Wed Nov 16, 2011 7:41 pm
Forum: Other projects
Topic: FreeBSD on Raspberry Pi
Replies: 22
Views: 9669

Re: FreeBSD on Raspberry Pi

<t>The Linux compatibility layer is for linux user programs (linux syscalls are emulated). But you can't use in a linux driver the last time I looked. You also need low level details, which can probably be derived from raspi specific linux code. Just that all this takes time and is really a wasted e...
by Bakul Shah
Tue Nov 15, 2011 3:27 am
Forum: Other projects
Topic: Lack of Broadcom documentation
Replies: 32
Views: 7750

Re: Lack of Broadcom documentation

<t>Quote from asb on November 14, 2011, 23:48<br/> The kernel code will of course be released under the GPL. This includes USB, SD access, and basic framebuffer support. You should be able to (with enough work) use that to implement basic support in the alternative OS of your choice.<br/> <br/> <br/...
by Bakul Shah
Tue Nov 08, 2011 6:47 pm
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 42988

Re: Break out board (GPIO, SPI, I2C, and UART)

Bacan, Why not just use the Beaglebone?
by Bakul Shah
Sun Nov 06, 2011 9:44 pm
Forum: Staffroom, classroom and projects
Topic: Inspirational people in Computer Science
Replies: 99
Views: 17943

Re: Inspirational people in Computer Science

<t>Sir Tony Hoare is one of my all time heroes too -- he did a lot more than invent Quicksort: Communicating Sequential Processes, Monitors, Hoare logic for reasoning about program correctness etc.<br/> <br/> How about some women inspirational figures like Jerri Ellsworth -- Self taught, cllege drop...
by Bakul Shah
Fri Nov 04, 2011 11:55 pm
Forum: General programming discussion
Topic: Educational Programming Language
Replies: 73
Views: 22829

Re: Educational Programming Language

<r>I think a competent programmer should know multiple languages including C but if it were up to me, I'd pick Scheme as the first language. Most of it is extremely simple, there are some decent introductory books on it, and Scheme being interactive you ignore dealing with a bunch of issues such as ...
by Bakul Shah
Fri Nov 04, 2011 6:19 pm
Forum: General discussion
Topic: Graphics preformance
Replies: 51
Views: 6762

Re: Graphics preformance

<t>Quote from asb on November 4, 2011, 15:03<br/> Quote from tufty on November 4, 2011, 14:52<br/> Well, there's the little matter of SD card access, USB, networking, serial ports, and so on. All of which, if I'm not mistaken, are non-ARM implementations on the silicon.<br/> <br/> <br/> Edit: sorry,...
by Bakul Shah
Fri Nov 04, 2011 12:36 am
Forum: Other projects
Topic: An OS for the R-Pi created completely in assembly
Replies: 54
Views: 16783

Re: An OS for the R-Pi created completely in assembly

<t>Quote from tufty on October 31, 2011, 21:41<br/> My current WIP is an on-the-metal scheme interpreter / compiler. It's maybe 10% ASM, 10% non-libc-dependent C, and the rest is (self-hosting, compiled) scheme. The whole damn thing compiles to under 50K, with symbols. Interpreter, compiler, IO, gar...
by Bakul Shah
Fri Nov 04, 2011 12:10 am
Forum: General discussion
Topic: Graphics preformance
Replies: 51
Views: 6762

Re: Graphics preformance

<t>Quote from jamesh on November 1, 2011, 17:36<br/> As for other OS's, I don't know how that will work. You should always be able to use the framebuffer, but acceleration will be more difficult. That said, porting an OS to a new platform isn't an easy task anyway.<br/> <br/> The Raspi is a Linux de...
by Bakul Shah
Tue Nov 01, 2011 5:03 pm
Forum: Other projects
Topic: Access to low level details
Replies: 0
Views: 977

Re: Access to low level details

<t>For porting alternative OSes one would need access to low level h/w interface details. Things like address map & details on programing non GPU things (usb, ethernet, gpio/i2s/spi, jtag, ...). Are these available? Also details how to access the "framebuffer" for 2D graphics would be useful.<br...
by Bakul Shah
Mon Oct 31, 2011 2:54 am
Forum: General discussion
Topic: 6V Lantern Battery
Replies: 11
Views: 5099

Re: 6V Lantern Battery

<r>The max capacity of a battery is measured at a <I><s>[i]</s>low<e>[/i]</e></I> current and the relationship is nonlinear -- if you draw 1Amp, it may only last an hour or two (when the voltage drops below 4.4V or so). Second, the cheaper batteries are zinc-carbon and have a lower capacity (11Ah to...
by Bakul Shah
Sun Oct 30, 2011 9:36 pm
Forum: Off topic discussion
Topic: PCB woes!
Replies: 21
Views: 4998

Re: PCB woes!

On the other hand, you can just *draw* a circuit with conductive ink! Just glue down components on a piece of paper and connect them! No need for vias. Just stick a piece of paper on existing `wire' and draw another on top! There is a video online that shows how to make your own conductive ink.
by Bakul Shah
Sat Oct 29, 2011 11:14 pm
Forum: Off topic discussion
Topic: PCB woes!
Replies: 21
Views: 4998

Re: PCB woes!

Here's a good list of PCB houses on ladyada.net. Also covers PCB software on another page.
by Bakul Shah
Sat Oct 29, 2011 9:11 pm
Forum: General discussion
Topic: Can the GPU be powered down?
Replies: 10
Views: 1959

Re: Can the GPU be powered down?

<t>Thanks for the quick response. Not really concerned about heat but wondered about the abs minimum power requirements when used as a server. A related question is if there is a `standby' or super low power mode. In such a case it would wake up with an external signal. For projects where it needs t...
by Bakul Shah
Sat Oct 29, 2011 8:50 pm
Forum: General discussion
Topic: Can the GPU be powered down?
Replies: 10
Views: 1959

Re: Can the GPU be powered down?

<t>When a RasPI is used as a server, there is no point in keeping the GPU warm! Once the OS is up and running, of course, since I understand the initial booting is done by the GPU. Just wondering if this is possible in the current design. Thanks.<br/> <br/> For 11 years I used a PentiumPro machine w...
by Bakul Shah
Fri Oct 28, 2011 9:00 am
Forum: Other projects
Topic: Cluster (Bramble...) Design Discussion (Advanced)
Replies: 170
Views: 87457

Re: Cluster (Bramble...) Design Discussion (Advanced)

<t>Here is a potential real application of a bramble: A giant billboard made from multiple displays. Of course, the displays will cost ridiculously more than the RasPis so may be you can dedicate N RasPis per display. Put tiny cameras at corners for interactivity. Create an edge to edge crisscross p...
by Bakul Shah
Fri Oct 28, 2011 8:19 am
Forum: Off topic discussion
Topic: Test
Replies: 8
Views: 1683

Re: Test

ping!

Yay! I can post again. Thanks Liz for fixing the problem. Much appreciated.
by Bakul Shah
Tue Oct 25, 2011 7:27 pm
Forum: Other projects
Topic: Cluster (Bramble...) Design Discussion (Advanced)
Replies: 170
Views: 87457

Re: Cluster (Bramble...) Design Discussion (Advanced)

<r>Check out Ron Minnich's cluster. 196 gumstix overos. 7 each attached to a gumstix stagecoach. the stagecoach has an 8 port 100MbE switch. 7 to connect the overos. 7 such assemblies in a 'shelf'. Each shelf has an 8 port switch. 7 go to the stagecoaches. In the end only one external connection. Re...
by Bakul Shah
Tue Oct 25, 2011 7:12 pm
Forum: Off topic discussion
Topic: Anyone going to ARM TechCon Oct 25-27 2011 in California
Replies: 13
Views: 2106

Re: Anyone going to ARM TechCon Oct 25-27 2011 in California

<r>Hi, I'd love to meet Eben and any RasPi hackers in the SF Bay area! I work not too far from Santa Clara Convention Center so if people are meeting, I can pop over for prawns & Pi given 15 minutes of notice (just email me)! With or without Eben, it would be good to form an informal group of Ba...

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