[lkml]   [2001]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Mounting a in-ROM filesystem efficiently
On Thu, 13 Dec 2001, Bradley D. LaRonde wrote:

> ----- Original Message -----
> From: "Thomas Capricelli" <>
> To: <>
> 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.

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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:14    [W:0.080 / U:2.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site