microSD support

[Crane, Matthew]

I think it can be a more general then that.   The cards that are
supported would be any standards compliant card, and the adress space
would be limited by what the kernel supports.  
 
The SD card association has limtied the size of sdhc to 32gb, the max
size of a fat32 system.  The kernel can support disks this large as can
the mmc card driver.
 
No doubt there's a lot of crappy SD cards out there that don't comply
well to standard interfaces though, but unless you're really really
skimping there's likely nothing to worry about with any common microsd
cards.
 
You could even support larger cards because we aren't limited to fat32
on a linux phone.
 
But has anybody found an SD card that doesn't work with existing
hardware??   I only wish I had hardware so I can't test the few cards I
have.. 
 
Matt
 

 
________________________________

From: community-bounces at lists.openmoko.org
[mailto:community-bounces at lists.openmoko.org] On Behalf Of Travis Tabbal
Sent: Friday, May 09, 2008 9:52 AM
To: List for Openmoko community discussion
Subject: Re: microSD support


I think he's asking if the phone will support SDHC, which is required
for larger cards and many older devices do not support. Or perhaps if
8GB in particular has been tested. It would be nice to know exactly what
is supported, as those 8GB cards are getting cheap lately. We might have
to wait for the first phones to ship to know for sure what will or will
not work. Right now, only the OM dev team at FIC could test it for sure,
and they are kind of busy getting mass production going. I think I'd
rather have them do that and test the microSD size limits later. 



On Fri, May 9, 2008 at 6:16 AM, Crane, Matthew <mcrane03 at harris.com>
wrote:



	>From wikipedia entry on current sd cards:
	
	Memory capacity = (C_SIZE+1) * 512 K = (222-1+1) * 512 K =
(4194304-1+1)
	* 512K = 2147483648 K = 2048 GB
	
	So you're probally good.
	


	-----Original Message-----
	From: community-bounces at lists.openmoko.org
	[mailto:community-bounces at lists.openmoko.org] On Behalf Of
Giorgio M.
	Sent: Friday, May 09, 2008 6:53 AM
	To: List for Openmoko community discussion
	Subject: microSD support
	
	
	I know that freerunner will support MicroSD memory.
	
	I want know wich capacity it will support?can i use 8GB
microSD??
	
	what is the limit?
	
	thanks
	
	
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