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SubjectRe: Mounting a in-ROM filesystem efficiently
On Thu, 13 Dec 2001, Bradley D. LaRonde wrote:

> ----- Original Message -----
> From: "Thomas Capricelli" <orzel@kde.org>
> To: <linux-kernel@vger.kernel.org>
> Sent: Thursday, December 13, 2001 11:41 AM
> Subject: Re: Mounting a in-ROM filesystem efficiently
>
>
> > Does it mean that NONE of the existing embedded linux is able to use a ROM
> > directly as a filesystem ?? (either root fs or not)
>

Generally, ROM based stuff is compressed before being written to
NVRAM. It's uncompressed into a RAM-Disk and the RAM-Disk is mounted.

That way, you can use, say, 2 megabytes of NVRAM to get a 10 to 20
megabyte root file-system. This also allows /tmp and /var/log to be
writable, which is a great help because the development environment
closely approximates the run-time environment.

FYI, generally NVRAM access is sooooo slow. I don't think you'd
like to use it directly as a file-system and access-time will be
a problem unless you modify the kernel.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).
Santa Claus is coming to town...
He knows if you've been sleeping,
He knows if you're awake;
He knows if you've been bad or good,
So he must be Attorney General Ashcroft.


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