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by jojopi
Wed Jan 25, 2012 6:37 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<r>sylvan said: <br/> <br/> <br/> Liam Fraser said:<br/> <br/> <br/> The size of the actual device is not stored in the partition table...<br/> <br/> <br/> You are wrong about that.<br/> <br/> The table stores the size of the device and the size of each partition.<br/> <br/> <br/> The device size is...
by jojopi
Wed Jan 25, 2012 4:06 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<t>Montekuri said: <br/> <br/> And if this is a ISO img we can just use ISO to USB app to write to a SD card:<br/> The ISO9660 file system is designed to be used on read-only media such as CD-ROMs.  Linux distributions for PCs are often available as ISOs because it is a well supported way to boot an...
by jojopi
Wed Jan 25, 2012 7:55 am
Forum: General discussion
Topic: ArchLinux ARM difficulties...
Replies: 31
Views: 7444

Re: ArchLinux ARM difficulties...

<t>rurwin said: <br/> <br/> FAT stands for File Allocation Table. That is a table stored in the partition that has one bit for every block of the partition. If the bit is 1 then the block is used, if it is 0 then the block is free.<br/> What you have described is a used/free blocks bitmap.  A FAT ha...
by jojopi
Sun Jan 15, 2012 11:12 pm
Forum: General discussion
Topic: ICS anyone?
Replies: 13
Views: 3846

Re: ICS anyone?

<t>rurwin said: <br/> <br/> <br/> I have an ASUS Transformer, so I have a keyboard and mouse. It works, but it"s obvious that it"s an add-on. Android is not designed to use it. For instance, there"s no Delete key on Android. There"s a backspace, but no delete. Consider what that would do for your ty...
by jojopi
Sat Jan 14, 2012 3:32 pm
Forum: General discussion
Topic: USB ports model A
Replies: 12
Views: 3188

Re: USB ports model A

<t>DeliciousRaspberryCake said: <br/> <br/> Now I'm not sure what the HDMI protocol says about the maximum current rating; but HDMI does describe a 5v supply to power up certain small chips for identification (like letting the tv know you connected a blu-ray player even when the player isn't on.<br/...
by jojopi
Sat Jan 14, 2012 1:20 pm
Forum: General discussion
Topic: remote desktop could simplify things a lot - Model C ?
Replies: 9
Views: 3962

Re: remote desktop could simplify things a lot - Model C ?

<t>rurwin said: <br/> <br/> <br/> Dave Kimble said: <br/> <br/> <br/> I can run the mail server on a EeePC with Atom N450 OK. How does that compare ?<br/> <br/> <br/> The RPi should be at least as good since the eeePC has the same speed processor. I have no experience of the ARM, but the rule of thu...
by jojopi
Wed Jan 11, 2012 12:20 am
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<r>Neil Mayhew said: <br/> <br/> Online resizing is less capable than offline (eg it doesn't increase the number of inodes,<br/> resize2fs on a mounted filesystem does increase the number of inodes, to exactly the same extent that offline resizing would.<br/> <br/> (Kernel-only (mount option) resizi...
by jojopi
Tue Jan 10, 2012 5:45 pm
Forum: Other projects
Topic: STICKY: Beta Boards mechanical data
Replies: 72
Views: 109732

Re: Beta Boards mechanical data

Interesting, thanks.

I note that your PCB measurements of 85×56 are squarer than the advertised 85.60×53.98 — and agree better with the board photos and Gerber screenshots.

Edit: though, according to your conventions it should be 56×85.
by jojopi
Tue Jan 10, 2012 9:26 am
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<t>sylvan said: <br/> <br/> I wouldn't bother replacing the initrd.  In fact, I don't see any reason for an initrd on the R-Pi.<br/> Also, what we have been told about the boot sequence on the Pi is that the GPU loads kernel.img and cmdline.txt from FAT before booting the ARM -- no mention of initrd...
by jojopi
Tue Jan 10, 2012 12:57 am
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<t>Neil Mayhew said: <br/> <br/> <br/> Most of what I"ve read elsewhere says this won"t work. If the kernel is using the file system, even read-only, it"s not safe to change the partition table, and certainly not safe to resize the file system. For example, the resizing utility itself could get move...
by jojopi
Mon Jan 09, 2012 11:20 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<t>Neil Mayhew said: <br/> <br/> So another possibility is to have a single partition that gets expanded on startup while Linux is still running out of the initrd (initial ram disk) before it has mounted the root partition. This requires putting parted and resize2fs into the initrd, which would caus...
by jojopi
Tue Jan 03, 2012 4:56 pm
Forum: General discussion
Topic: Can It handle Blu-ray playback ?
Replies: 42
Views: 26136

Re: Can It handle Blu-ray playback ?

<t>Also, BD players are required to support both H.264 and VC-1.  I have seen nothing to indicate that the Pi will support VC-1.  (The GPU is probably capable but the Foundation may wish to avoid any additional patent licenses for redundant codecs.)<br/> <br/> I do not know what percentage of BDs ac...
by jojopi
Wed Dec 28, 2011 5:37 pm
Forum: Other projects
Topic: PiCard - GUI SD Preparation Tool
Replies: 268
Views: 78328

Re: PiCard - GUI SD Preparation Tool

<t>You should consider whether it would be less work, and make it easier to support Windows, if you pre-prepared compressed image files for each common size of flash card.  Then no actual partitioning and formatting would be required at "burn" time.<br/> <br/> Better still, the distros should releas...
by jojopi
Tue Dec 27, 2011 7:34 pm
Forum: General discussion
Topic: D-sub/Vga Monitor Cables/ Accesories
Replies: 24
Views: 10883

Re: D-sub/Vga Monitor Cables/ Accesories

<t>liam said: <br/> <br/> <br/> I have a HDMI to DVI connector and an Apple DVI to VGA connector from a mini-mac. When I get my hands on a RPi I will try and bolt it all together and see if it works with an old VGA monitor I have.<br/> <br/> <br/> <br/> The Mac Mini had DVI-I (digital and analog out...
by jojopi
Fri Dec 16, 2011 12:16 pm
Forum: General discussion
Topic: Coburns take on powering the Raspberry Pi via batteries
Replies: 69
Views: 14777

Re: Coburns take on powering the Raspberry Pi via batteries

<t>Quote from abishur on November 30, 2011, 14:46<br/> You can make sure just to get a voltage boost with a fixed output.<br/> <br/> <br/> But what actual boost converter are you proposing to use, and what does its datasheet say about input voltages greater than its fixed output? How does efficiency...
by jojopi
Mon Dec 12, 2011 7:03 am
Forum: General discussion
Topic: GPU and boot
Replies: 28
Views: 4472

Re: GPU and boot

<r>[quote]<B><s>[b]</s>Quote from sylvan on December 12, 2011, 05:52<e>[/b]</e></B><br/> It\'s handy to know that the GPU is also ARM. That gives a starting point to subvert or reverse engineer it. (that seems a really odd engine for a GPU, but whatever works...)[/quote]<br/> <br/> It would be if ab...
by jojopi
Mon Dec 12, 2011 2:11 am
Forum: General discussion
Topic: GPU and boot
Replies: 28
Views: 4472

Re: GPU and boot

<r>[quote]<B><s>[b]</s>Quote from gsh on December 11, 2011, 16:26<e>[/b]</e></B><br/> I\'m not sure what you mean, are you suggesting that signing a boot image is not a level of security? Or are you just another troll spoiling for a fight?[/quote]<br/> <br/> Sorry, the last thing I intended was to g...
by jojopi
Sun Dec 11, 2011 12:13 pm
Forum: General discussion
Topic: GPU and boot
Replies: 28
Views: 4472

Re: GPU and boot

<r>[quote]<B><s>[b]</s>Quote from gsh on December 11, 2011, 09:35<e>[/b]</e></B><br/> Plus it is more secure because it\'s far harder to reverse engineer the code to make changes (the bootrom image is signed such that you can\'t go messing around with the binary blob)[/quote]<br/> <br/> Then do you ...
by jojopi
Sat Dec 10, 2011 11:27 pm
Forum: General discussion
Topic: New forum request
Replies: 11
Views: 2593

Re: New forum request

Even apart from the fact that it would it be a lot of work, I also see no reason to port the existing forum threads.

Once we all have RPis, discussions will become a lot more concrete. And we know that most threads re-erupt every few weeks anyway.
by jojopi
Sat Dec 10, 2011 6:35 pm
Forum: General discussion
Topic: UART for using Raspi without a screen
Replies: 48
Views: 11795

Re: UART for using Raspi without a screen

<r>[quote]<B><s>[b]</s>Quote from xkxx on December 10, 2011, 16:10<e>[/b]</e></B><br/> I think uart is for outputting kernel boot messages and once I connect to uart I can use it as a console. It doesn\'t depend on any special drivers on the images loaded on raspberry pi, does it?[/quote]<br/> <br/>...
by jojopi
Sat Dec 10, 2011 3:36 pm
Forum: General discussion
Topic: UART for using Raspi without a screen
Replies: 48
Views: 11795

Re: UART for using Raspi without a screen

<t>As I understand it, the UART pins will be low-voltage logic level. So you will need a special serial adapter anyway, not a regular RS232 adapter. And there is no universally standard pinout for these, so you would always need to work out cabling.<br/> <br/> Actually, I think it is probably easier...
by jojopi
Sat Dec 10, 2011 4:16 am
Forum: General discussion
Topic: Powering the Pi
Replies: 28
Views: 3376

Re: Powering the Pi

[quote]Quote from hamjudo on December 9, 2011, 16:41
The 3 terminal package on the board suggests that there is a second diode in use on each port.[/quote]

There do not appear to be any tracks or vias connected to the north pads.
by jojopi
Fri Dec 09, 2011 3:43 pm
Forum: General discussion
Topic: Powering the Pi
Replies: 28
Views: 3376

Re: Powering the Pi

[quote]Quote from hamjudo on December 9, 2011, 15:19
What are D10 and D11?[/quote]

These connect to the PRTCTL pins on the 9512 to prevent it from powering the device but allow it to detect if the PPTC opens. See the datasheet for details.
by jojopi
Fri Dec 09, 2011 4:56 am
Forum: General discussion
Topic: How different are the A and B boards?
Replies: 9
Views: 1920

Re: How different are the A and B boards?

<r>[quote]<B><s>[b]</s>Quote from willrandship on December 9, 2011, 04:33<e>[/b]</e></B><br/> 1 more ram module, 1 USB Lan chip and 1 LAN connector, plus the extra USB Header.[/quote]<br/> <br/> Plus three LEDs, polyfuse and diode pair, quartz crystal, quite a number of resistors and capacitors. Min...
by jojopi
Fri Dec 09, 2011 12:00 am
Forum: Off topic discussion
Topic: Its Gone Awfully Quiet...
Replies: 80
Views: 7872

Re: Its Gone Awfully Quiet...

Quote from Bacan on December 8, 2011, 23:14
Is this a UK only link or is my server (AT&T) all mucked up?


Extraneous period at end of URL.

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