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Re: Where are the specs?

Posted: Thu Mar 22, 2012 2:02 pm
by Shavano
I was surprised to find that after browsing around for a few minutes, I couldn't find the electrical and mechanical specs for a Raspberry Pi.

Where are they?

Re: Where are the specs?

Posted: Thu Mar 22, 2012 2:33 pm
by rurwin
Spread around thinly.

Electrical Spec is 5V +/- 0.25V @ 700mA input.

The USB ports supply up to 100mA.

GPIO ports are 3.3V signals at <5mA. It also supplies 5V at whatever is left from (either the input or 1A) whichever is lower, and 3.3V at a few mA.

HDMI output is digital only.

SD card is full size. Avoid Class 10.

USB is 2.0 only.

Ethernet is 10/100 only.

Mechanical specs are as per Gert's Mechanical drawings of the Beta boards, which is a topic pinned in one of the fora. The only difference is that the SD card holder is entirely within the confines of the board and about 3.5mm high.

Before the public/educational release, all of this stuff will be published in a reasonable form.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 2:35 pm
by meltwater
A lot of info is within the wiki or linked to from it.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 2:45 pm
by abishur
Specifically this page of the wiki has all the hardware info

Re: Where are the specs?

Posted: Thu Mar 22, 2012 3:53 pm
by Skygod
An SD card IS required to boot the Rpi, but where is it stated what the minimum size is?

Early discussions were that an image could be loaded onto a 1Gb device and then the rest of the filesystem could be mounted on external USB mounted devices.

This is no longer the case as the Fedora Remix requires 1.6Gb

My free supply of "useless" 1Gb SD cards would now appear to be "useless" to me.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 3:56 pm
by grumpyoldgit
All the images produced so far have been at the 2GB mark. I have never seen mention of 1GB in anything I have seen. 4GB and 8GB cards are dirt cheap.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 4:00 pm
by RaTTuS
you should be able to make a custom build yourself that works.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 4:14 pm
by abishur
I've been recommending 4GB cards simply because some people have had issues getting it onto 2GB cards (an issue with how they define the size of a GB) but as RaTTus says a custom build should drop that size down.  I'm also hoping that very small distros will start popping up (like Mint or even FreeNAS)

Re: Where are the specs?

Posted: Thu Mar 22, 2012 5:14 pm
by Skygod
It's simply a case of I was given a (substantial) number of 1Gb cards FOC. When the cost of a 2Gb card is equal to more than a days labour, costs matter!

(Average earnings = $7 der day)

Re: Where are the specs?

Posted: Thu Mar 22, 2012 5:49 pm
by Ravenous
Hang onto those 1GB cards, they may be usable - someone is bound to try and do a tiny cut-down operating system.  BBC basic anybody?

Re: Where are the specs?

Posted: Thu Mar 22, 2012 6:21 pm
by hippy
1GB should be plenty for cut down distros, bare metal programming, or minimal setups which facilitate booting from USB HDD or over a network.

I recall the GPU 'binary blob' was said to be about 18MB so there's even hope for old 32MB MMC cards to find new life.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 6:50 pm
by dom
openELEC is fine on a 1MB card (I think it could fit on a 128M card if you don't need much user data).

For other distributions you only need the boot (FAT) partition to be on the sdcard. I think you could get away with about 10MB for that, and then mount the rootfs from a network or usb drive.

Re: Where are the specs?

Posted: Thu Mar 22, 2012 7:35 pm
by HansH
Skygod said:



My free supply of "useless" 1Gb SD cards would now appear to be "useless" to me.


No, just wait a while, 1 gb should be more then enough to start a server version.

My soekris system is using 412 Mb storage for debian linux .

When the Pi's arrive, more img files will appear..

Re: Where are the specs?

Posted: Fri Mar 23, 2012 12:30 am
by SirLagz
I'm planning on using my 1 GB sd card to install Debian onto.

I doubt it will be that hard as I have already installed Debian x86 onto a 512Mb Disk-on-Module on one of my thin clients.

Re: Where are the specs?

Posted: Sun Mar 25, 2012 5:58 am
by cnxsoft
Skygod said:


It's simply a case of I was given a (substantial) number of 1Gb cards FOC. When the cost of a 2Gb card is equal to more than a days labour, costs matter!

(Average earnings = $7 der day)



You should still be able to use Fedora or Debian on a 1GB SD card + Thumbdrive.

You would just have the FAT32 partition on the SD, change the kernel boot command line and put the rootfs (second partition) on the USB drive. I think I may do that since I have 2 low capacity SD Cards (64 MB and 256 MB) around.

You could also make your own Debian distribution (with debootstrap) and not go over the 1 GB limit.