Re: [RFC] MTD driver for MMC cards

Jörn Engel
2007-04-16T00:36:15Z

On Mon, 16 April 2007 01:33:17 +0200, Arnd Bergmann wrote:
>
> There is also still some need for performance testing. Jörn
> brought up the point that if a specific card can't have multiple
> open erase block simulateously, it's rather pointless for
> logfs. It might still be useful to use jffs2 on those cards,
> because IFAIK that only writes to one erase block at any
> time.

This appears to be a problem for practically all consumer-available
flash media. They spend a lot of effort trying to hide any flash
properties from their users. And while this is a decent strategy for
FAT, ext3, ntfs and similar, it is actually very inefficient for a flash
filesystem.

After talking to several manufacturers, most seemed to be fairly
open-minded towards supporting an alternate interface with raw flash
access. So much for the good news. Bad news is that such an elternate
interface still needs to be defined.

Jörn

--
Courage is not the absence of fear, but rather the judgement that
something else is more important than fear.
-- Ambrose Redmoon