Messages in this thread | | | Date | Thu, 13 Dec 2001 13:02:45 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Mounting a in-ROM filesystem efficiently |
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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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