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by psergiu
Thu Jun 21, 2012 2:58 pm
Forum: Advanced users
Topic: Decoding the RPi serial number
Replies: 29
Views: 14175

Decoding the RPi serial number

Hi everyone, Can someone from the foundation please tell us the serial number encoding scheme ? Surely it's not incremental - even if the first 10 RPis that were sold on the eBay had a low serial number, my 2nd pi has 000000004db34690 - that's "1303594640" in decimal and there's no way that many hav...
by psergiu
Thu Jun 21, 2012 1:27 pm
Forum: Advanced users
Topic: Disabling Video (for a little more ARM RAM bandwidth)
Replies: 9
Views: 9904

Re: Disabling Video completely

Yeah, but those 1-2% are on top of the ones gained by overclocking :) Next step - install Gentoo and start recompiling everything with -O99 -fexpensive-optimizations :P Then paint two white lines on the RPi board, add some tiny racing stickers on the sides of the USB & Ethernet ports and replace the...
by psergiu
Thu Jun 21, 2012 12:19 pm
Forum: Advanced users
Topic: Disabling Video (for a little more ARM RAM bandwidth)
Replies: 9
Views: 9904

Re: Disabling Video completely

So it's 1% or 2% extra general performance for a headless RPi by adding just two lines in rc.local.
Yay ! :D
by psergiu
Wed Jun 20, 2012 10:13 pm
Forum: Advanced users
Topic: Disabling Video (for a little more ARM RAM bandwidth)
Replies: 9
Views: 9904

Re: Disabling Video completely

fbset -xres 16 -yres 16 -vxres 16 -vyres 16 -depth 8
/opt/vc/bin/tvservice -o

and i got 149.80 Mb/s

That's a 5% gain over the default HDMI resolution [email protected]
by psergiu
Wed Jun 20, 2012 9:30 pm
Forum: Advanced users
Topic: Disabling Video (for a little more ARM RAM bandwidth)
Replies: 9
Views: 9904

Re: Disabling Video completely

I did some tests with RAMspeed ( Debian 6, bootc's 3.2.20, serial console, ramspeed flags used: "-b 3 -l 5 -r") [email protected] - RAM speed ======================= [email protected] (PAL w/ overscan) - 148.69 Mb/s [email protected] - 146.16 Mb/s [email protected] - 142.72 Mb/s Not able to set a higher resolution with...
by psergiu
Wed Jun 20, 2012 4:24 pm
Forum: Advanced users
Topic: Disabling Video (for a little more ARM RAM bandwidth)
Replies: 9
Views: 9904

Disabling Video (for a little more ARM RAM bandwidth)

The VideoCore shares the RAM with the ARM - the same way the SGI O2 did. With the SGI O2, you would have up to 13% increase in performance by lowering the video resolution . That is because 50 or 60 times every second (video refresh rate), the video DAC on the O2 will have exclussive RAM access in o...
by psergiu
Wed Jun 20, 2012 4:02 pm
Forum: Advanced users
Topic: squeeze more RAM out of the GPU
Replies: 12
Views: 4649

Re: squeeze more RAM out of the GPU

For x86 there is an offical way of allocating a RamDisk in the video RAM http://en.gentoo-wiki.com/wiki/Using_Graphics_Card_Memory_as_Swap but: how to find the start & size of the video RAM ? Is this the address: [ 1.277076] BCM2708FB: start = ce900000,4f385000 width=656, height=512, bpp=1 6, pitch=...
by psergiu
Fri Jun 15, 2012 10:33 am
Forum: Off topic discussion
Topic: Windows & OS X on Raspberry Pi
Replies: 24
Views: 13786

Re: Windows & OS X on Raspberry Pi

Nice one! What I am REALLY curious about though, is if you can run a hackintosh version on the RPi? Nope. The hardware emulated by Bochs is not supported by OS X 10.4 Intel or newer. Max you can do with Bochs is Rhapsody. it COULD be possible with QEMU - the main issue being that OS X for Intel wan...
by psergiu
Mon Jun 04, 2012 5:02 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C installation
Replies: 12
Views: 4173

Re: I2C installation

run rpi-update to get the latest firmware before copying the kernel in /boot.

Warning - rpi-update will also replace kernel.img - keep a copy of your i2c-enabled vmlinuz
by psergiu
Sun Jun 03, 2012 7:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C installation
Replies: 12
Views: 4173

Re: I2C installation

http://www.bootc.net/raspberrypi/linux- ... _armel.deb

if you don't want to install the .deb, you can unpack-it with:

Code: Select all

ar xv linux-image-3.2.18-rpi1+_5_armel.deb
tar xvf data.tar.gz
and move vmlinuz from there as /boot/kernel.img
by psergiu
Fri Jun 01, 2012 9:34 pm
Forum: Off topic discussion
Topic: Windows & OS X on Raspberry Pi
Replies: 24
Views: 13786

Re: Windows & OS X on Raspberry Pi

Wasn't able to check - the poor Pi was so loaded that the mouse cursor was jumping around the screen good seconds after i was moving the mouse. sshd and all the rest of the daemons were down so i could not login remotely. When the X11 screensaver came on, it took around 30 seconds for the screen to ...
by psergiu
Fri Jun 01, 2012 9:14 pm
Forum: Advanced users
Topic: squeeze more RAM out of the GPU
Replies: 12
Views: 4649

Re: squeeze more RAM out of the GPU

I remember toiling for 2 whole days, calling all BBS-es i knew and trying all the memory management software i could download in order to squeeze 2 more Kilobytes of XMS RAM on my 286 in order to be able to play Prince of Persia 2 with sound :-) If it's there, why not use it ? I think 8Mb of swap in...
by psergiu
Fri Jun 01, 2012 3:08 pm
Forum: Advanced users
Topic: squeeze more RAM out of the GPU
Replies: 12
Views: 4649

Re: squeeze more RAM out of the GPU

If we only use the serial console, can we somehow use the framebuffer as a block device for swap or ramdisk ?
1920x1080x4 (32 bit) =~ 8Mb.
16Mb if there's double buffering in there.
by psergiu
Thu May 31, 2012 1:30 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Kernel panic w/ PCF8563 I2C RTC & bootc kernel
Replies: 4
Views: 5270

Re: Kernel panic w/ PCF8563 I2C RTC & bootc kernel

Oh yes, it works ! Thanks a lot. [email protected]:~# echo pcf8563 0x51 > /sys/class/i2c-adapter/i2c-0/new_device [email protected]:~# dmesg | tail -5 [ 52.712747] i2c /dev entries driver [ 73.359291] rtc-pcf8563 0-0051: chip found, driver version 0.4.3 [ 73.360958] rtc-pcf8563 0-0051: low voltage det...
by psergiu
Wed May 30, 2012 10:47 pm
Forum: Debian
Topic: New Debian images
Replies: 11
Views: 3359

Re: New Debian images

Whoopsie, posted in the wrong forum, i was sure this thread was in Raspbian.

Thanks a lot for the info, Dom !
by psergiu
Wed May 30, 2012 4:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Kernel panic w/ PCF8563 I2C RTC & bootc kernel
Replies: 4
Views: 5270

Kernel panic w/ PCF8563 I2C RTC & bootc kernel

Hi everyone, I built myself a Olimex MOD-RTC clone with the PCF8563 chip using the schematics from their page: http://www.olimex.com/dev/mod-rtc.html (i even included the 330ohm resistors on the SDA & SCL lines, the RTC board works ok when connected to a DuinoMite) I'm using the "official" debian im...
by psergiu
Wed May 30, 2012 7:46 am
Forum: Debian
Topic: New Debian images
Replies: 11
Views: 3359

Re: New Debian images

I'm one of the ones not able to run rpi-update. I dd the default raspbian-r3.img to a SD card, and it boots ok with some SD-card timeouts. Upgrading with apt-get is no problem, but every time i run rpi-update, i get some SD timeouts and the result is an unbootable SD card. (yes, i know i should try ...
by psergiu
Wed May 23, 2012 6:34 am
Forum: Off topic discussion
Topic: Who has the most raspis?
Replies: 9
Views: 1525

Re: Who has the most raspis?

I might have three if i manage to persuade my two RPis to have babies.
How does one finds out which RPi is a girl and which is a boy ? :lol:
by psergiu
Wed May 23, 2012 6:26 am
Forum: Off topic discussion
Topic: VIA's entry into the low cost computer market
Replies: 102
Views: 13448

Re: VIA's entry into the low cost computer market

Since Raspberry Pi appeared, a ton of various "RPi killers" were announced by various companies. Some of them are vapourware, the rest exist as less than a dozen prototype boards and none of them are yet in the market. The Raspberry Pi is shipping. I have one in front of me. Let's wait and see if VI...
by psergiu
Fri May 18, 2012 9:39 am
Forum: Off topic discussion
Topic: R-Pi as a Webserver - Performance
Replies: 10
Views: 4567

Re: R-Pi as a Webserver - Performance

also - what are the my.ini DB cache settings on the VPS server and on the Pi ?
by psergiu
Wed May 16, 2012 11:39 pm
Forum: Off topic discussion
Topic: Windows & OS X on Raspberry Pi
Replies: 24
Views: 13786

Re: Windows & OS X on Raspberry Pi

abishur: At install time (on a faster box), i stopped almost all the services from that WinXP image - Task Manager was showing that way less than 96Mb of ram was used.
I guess if had allocated 128Mb of ram to XP it would have booted in 4 hours instead of 5 :)
by psergiu
Wed May 16, 2012 11:06 pm
Forum: Off topic discussion
Topic: Windows & OS X on Raspberry Pi
Replies: 24
Views: 13786

Re: Windows & OS X on Raspberry Pi

Windows finally finished loading.
SAM_0390s.jpg
SAM_0390s.jpg (62.86 KiB) Viewed 13769 times
by psergiu
Wed May 16, 2012 10:31 pm
Forum: Off topic discussion
Topic: Windows & OS X on Raspberry Pi
Replies: 24
Views: 13786

Windows & OS X on Raspberry Pi

Do Windows and OS X run on Raspberry Pi ? YES ! They do ! Both at the same time ! SAM_0386s.jpg SAM_0389s.jpg RPi booted with 224Mb blob, Debian, all daemons stopped, WindowMaker WM WinXP sp2 with almost all services disabled installed under Bochs, 96Mb RAM Mac OS X 10.3 installed under PearPC 0.5, ...
by psergiu
Wed May 16, 2012 10:15 pm
Forum: Off topic discussion
Topic: Bling-Bling
Replies: 1
Views: 783

Bling-Bling

Designer clothing ? Thick golden chains ? Diamond tooth fillings ? nah ... The ultimate Bling are multiple Raspberry Pis ... Who else has TWO RPis ? :lol: SAM_0379s.jpg (nr.1 from Farnell, nr.2 from RS - after some experiments, nr.2 will get lended to techie friends who have not received their Pi yet)
by psergiu
Wed May 16, 2012 12:00 pm
Forum: Troubleshooting
Topic: Debian 19-04-2012 issues
Replies: 13
Views: 6121

Re: Debian 19-04-2012 issues

656x416
adding the default 32 pixel overscan on each of the sides:
720x480 - Perfect maximal composite resolution.
If you want more, use HDMI.

Case closed.

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