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by summers
Sat Aug 25, 2012 1:25 pm
Forum: Linux Kernel
Topic: Hard Float kernel for Rasbrian
Replies: 5
Views: 3718

Re: Hard Float kernel for Rasbrian

Interesting article. Yes I can see why the set -msoft-float now. Logic a bit convoluted. Guess its just strongly encouraging people not to use floats in the kernel, which I guess could be more transparanetly done by one of the coding rules for the kernel.
by summers
Tue Aug 21, 2012 1:23 pm
Forum: Linux Kernel
Topic: Hard Float kernel for Rasbrian
Replies: 5
Views: 3718

Hard Float kernel for Rasbrian

Noticed something odd last night, when compiling a plain vanilla linux kernel for my panda board. My default gcc is hard float, but passing V=1 to the make command could see -msoft-float was being defined. Turns out its defined that way in arch/arm/Makefile. So just wondering if the same issue is th...
by summers
Sat Jul 21, 2012 8:23 am
Forum: General discussion
Topic: What's yours called?
Replies: 42
Views: 5142

Re: What's yours called?

George
by summers
Fri Jul 20, 2012 10:44 am
Forum: Raspbian
Topic: Error: selected FPU does not support instruction
Replies: 4
Views: 4253

Re: Error: selected FPU does not support instruction

Isn't NEON only implemented in cortex-a8 and cortex-a9, didn't think it was available in arm11 ....

e.g. are you sure neon is available on the RPi?
by summers
Fri Jun 29, 2012 9:22 am
Forum: General discussion
Topic: Help on saving sdcard image?
Replies: 5
Views: 2041

Re: Help on saving sdcard image?

One the size of the partiation has been increased on the SD card, a DD of the raw image will give rather a large file. If you want to save some space, instead just take a copy of the files, so something like: cd /path/to/root tar cf ../debian.tar . then probably compress the result bzip2 debian.tar ...
by summers
Thu Jun 28, 2012 3:04 pm
Forum: Raspbian
Topic: How can I debug the RPi's kernel without a monitor?
Replies: 2
Views: 3203

Re: How can I debug the RPi's kernel without a monitor?

Something else to add. When booting the kernel pass the argument "console=whatever" Where /dev/whatever is the device file of the serial line you are watching ... Kernel takes a short time to get far enough though to be able to direct messages to the console though - so you may not get a message ...
by summers
Mon Jun 25, 2012 9:11 pm
Forum: Raspbian
Topic: MATE for Raspbian
Replies: 145
Views: 101485

Re: MATE for Raspbian

Suspect this isn't where raspbian is at right now - its still alpha/beta software. Means that at the moment it probably going to be a bit clunky. So first time users probably better off by using one of the other builds. Of course Rasbrian is aiming at how to get the best out of the RPi hardware - so...
by summers
Mon Jun 25, 2012 8:22 pm
Forum: Raspbian
Topic: Cross Compiling for Raspbian?
Replies: 12
Views: 9411

Re: Cross Compiling for Raspbian?

when I compile a cross compiler (I do it from scratch, so using gcc, binutils, uClibc), I normally do: --target=armv7-hardfloat-linux-gnueabi --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu so give the full name, and for me specify host and build (as well as target) as I compile and run the c...
by summers
Sun Jun 03, 2012 8:35 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

Yup, and this work is still on-going too: https://github.com/raspberrypi/linux Ta - thanks, most interesting post so far. Hard to dig into github - but shows activity, which is good. Odd how much is focsued on the GPU - yes I guess its what most people are interested in - but there is so much more ...
by summers
Sun Jun 03, 2012 9:49 am
Forum: General discussion
Topic: how to make PI out of PI?
Replies: 16
Views: 3513

Re: how to make PI out of PI?

# pi.py - calculates the constant pi (the ratio of the circumference to the diameter of a circie) # to any arbitrary number of digits # Usage: python pi.py number_of_digits - e.g., to calculate pi to 100 digits of accuracy, python pi.py 100 # This program uses Machin's formula (per John Machin circ...
by summers
Sun Jun 03, 2012 8:58 am
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

Just noticed that Rob Clark of TI (well seems he's also linarno) has a blog. Its worth reading his post of Saturday, April 14, 2012 - just his view of someone hacking about with arm based boards, and more relevent someone doing something about it: http://bloggingthemonkey.blogspot.co.uk/ I guess the...
by summers
Sat Jun 02, 2012 2:18 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

I think thats why I wanted to talk far wider than just GPU software interafces to hardware interfaces. As GPUs are a complex area. So lets back off a bit. The operating system that is based to run on the RPI is GNU/Linux - both open source developments. The open source nature of both GNU and Linux i...
by summers
Fri Jun 01, 2012 11:20 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

@summers I'm not sure if I am understanding you correctly, but dom and the others (so far as i know) are trying to open-source the userspace libraries (OpenVG , OpenMAX , OpenGL etc.). As usual no promises , no ETA. Yes that was what I'm asking, what open source activity specific to RPi hardware is...
by summers
Fri Jun 01, 2012 2:50 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

But MOST video codecs are proprietary!! When you play video in XYZ format, that format is the Intelectual Property of someone and you have to pay that someone to use it. There are people who develope "converters" that change XYZ format to play on your ABC device, but most of the time that is done i...
by summers
Fri Jun 01, 2012 2:20 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

You seem to be missing the point. We have the driver for the GPU. What we are missing are some of the codecs for decoding video formats. Do you get the difference? It isn't a question of Broadcom giving them to us. Broadcom doesn't own them. In order for Broadcom to implement them for the RPi someo...
by summers
Fri Jun 01, 2012 12:44 pm
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Re: Open Sourcing the drivers

I think one of the differences is that TI is much more supportive of the "hobbyist market" - their chips are available in small volumes. But Broadcom is geared up much more towards the industrial/mobile phone market - their chips are only available in large volumes. But from what's been said, it lo...
by summers
Fri Jun 01, 2012 10:27 am
Forum: General discussion
Topic: Open Sourcing the drivers
Replies: 16
Views: 2904

Open Sourcing the drivers

I'll start off by saying that I'm not having a go at anyone here - the world is the way it is, and lets live with it. Anyway, the question, linux is only just starting out in a big way on arm cpus, so comparing it to the x86 linux its going though much of what x86 did 15 years ago or so. Mainly I'l ...
by summers
Fri May 18, 2012 6:25 pm
Forum: General discussion
Topic: Spinning down HDD?
Replies: 33
Views: 68435

Re: Spinning down HDD?

FollowingGhosts wrote:I tried all night last night, but HDParm kept giving me errors ...
what errors out of interest

I've usually found errors are bcause the HDD doesn't support some options ...
by summers
Fri May 18, 2012 10:34 am
Forum: General discussion
Topic: Spinning down HDD?
Replies: 33
Views: 68435

Re: Spinning down HDD?

Yes hdparm is he way to do this. Can make things a tad unstable, when the OS tries to access the hard disk, and it needs to spin up first, things time out. There are various flags you can pass, -y -Y -s -S, read the man page. Not all hard drive take all options - but you might as well try. Usually s...
by summers
Tue May 15, 2012 10:23 am
Forum: Other programming languages
Topic: Programming the ARM chip
Replies: 134
Views: 44450

Re: Programming the ARM chip

If you want to go in the JTAG direction, then you'll need to get something like a pandaboard, and the JTAG dongle isn't cheap either .... Now you'll be able to get the same code inro the ARM be writing fictional kernel images and writing to SD, as using the JTAG. It isn't clear if the arm comes up i...
by summers
Fri May 11, 2012 3:29 pm
Forum: General discussion
Topic: config.txt
Replies: 172
Views: 76069

Re: config.txt

dom said:

@summers
cmdline.txt is written by GPU blob to space allocated for "ATAGs" inside the kernel image (at 0x100). The kernel *will* see the command line arguments.


OOps yes - i was think of config.txt ....
by summers
Fri May 11, 2012 11:53 am
Forum: General discussion
Topic: config.txt
Replies: 172
Views: 76069

Re: config.txt

<t>Mjiig said: <br/> <br/> <br/> Regarding the arguments that was new to me. How does the kernel get at it's options then? (GRUB I think allows passing of "command line" options to linux, and on the RiPi that appears to be the point of cmdline.txt).<br/> <br/> <br/> Probably the easiest way is to co...
by summers
Wed May 09, 2012 10:41 am
Forum: General discussion
Topic: Where to get a good PSU from
Replies: 33
Views: 8548

Re: Where to get a good PSU from

<r>hzrnbgy said: <br/> <br/> <br/> If you fancy reading datasheets from the manufacturers regarding their PSUs ripple, efficiency levels, etc, nothing beats good 'ol mouser.com<br/> <br/> <URL url="http://www.mouser.com/Power/Pl.....fmZ1z0wda9">http://www.mouser.com/Power/Pl.....fmZ1z0wda9</URL><br/...
by summers
Wed Mar 28, 2012 10:09 am
Forum: Other projects
Topic: Parallel Pi, Combining 2 raspberry pis 2 get one more powerful computer
Replies: 18
Views: 37937

Re: Parallel Pi, Combining 2 raspberry pis 2 get one more powerful computer

<t>I find it hard to see the point of two pi's. Look at the specs of:<br/> <br/> RPi -> Beagleboard (bone) -> Pandaboard<br/> <br/> Both prices and processing power go up as you move the the right. So if you need a machine with more grunt - wouldn't you just buy a board to the  right, rather than 2 ...
by summers
Sun Mar 18, 2012 5:50 pm
Forum: General discussion
Topic: How do I build my own cross-compiler?
Replies: 4
Views: 1560

Re: How do I build my own cross-compiler?

<r>Check the linux from scratch web site: <URL url="http://www.linuxfromscratch.org/">http://www.linuxfromscratch.org/</URL><br/> <br/> Whilst it doesn't explain exactly what you want to do (e.g. they are building something that will run on the same machine you are building on) - it does explain the...

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