Messages in this thread | | | From | "Bradley D. LaRonde" <> | Subject | Re: Mounting a in-ROM filesystem efficiently | Date | Thu, 13 Dec 2001 11:22:15 -0500 |
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I have maintained, on and off, a patch to crafms that supports traditional cramfs decompress-and-read/run-from-RAM, plus direct mmaping with no decompression and read/run straight out of ROM:
http://www.ltc.com/~brad/mips/cramfs-linear-root-xip-linux-2.4.9-2.diff
It includes a modification to mkcramfs to compress or not compress individual files based on their +t mode setting. Mkcramfs will leave +t uncompressed in the cramfs image and cramfs will directly mmap them.
Please note that the patch is against 2.4.9. I haven't tried to use it since then.
Regards, Brad
----- Original Message ----- From: "Thomas Capricelli" <orzel@kde.org> To: <linux-kernel@vger.kernel.org> Sent: Thursday, December 13, 2001 11:02 AM Subject: Mounting a in-ROM filesystem efficiently
> > > Hello, > > I'm looking for a way to put a filesystem into ROM. > Seems pretty trivial, isn't it ? > > My understanding is (the way initrd does, and the way I do as of today) > * create a RAMDISK > * loads the data into ramdisk > * mount the ramdisk > > problem is that I don't want to waste the RAM as the data in the ROM is > already in the address space. (it's an embedded system, btw) > > Speed is not an issue here. ROM access might be slower than RAM, it will > always be so much quicker than a disk access. (wrong?) > > Ideally, i would give address/length of the fs in ROM to a function, and I > would get a ramdisk configured to read its data exactly there, and not in > ram. > > Any hint ? > > I've tried to look in the different options from mainstream kernels and > embedded-oriented kernels whithout success. > > > thanx, > Thomas > ps : i'm subscribed to lkml, no need to cc: > > -- > Thomas Capricelli <orzel@kde.org> > boson.eu.org, kvim, zetalinux- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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