Date: Mon, 6 Apr 2009 12:24:10 +0400 From: Stanislav Sedov <stas@FreeBSD.org> To: Andrew Turner <andrew@fubar.geek.nz> Cc: freebsd-embedded@freebsd.org, freebsd-geom@freebsd.org Subject: Re: FreeBSD NAND flash driver Message-ID: <20090406122410.daab24b3.stas@FreeBSD.org> In-Reply-To: <20090405175014.6aef7016@fubar.geek.nz> References: <20090405175014.6aef7016@fubar.geek.nz>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sun, 5 Apr 2009 17:50:14 +1200 Andrew Turner <andrew@fubar.geek.nz> mentioned: > I've been working on a FreeBSD NAND flash driver and NAND simulator [1]. > I have tested reading and writing to the simulated NAND device but not > erasing. Great news! > It is not usable yet as the write will not perform any deletes from the > device, either the file system or another geom will have to issue > a BIO_DELETE followed by BIO_WRITE's to write to the disk. This is done > to support NAND flash aware file systems. > So, for ordinary file systems we're going to use the special geom layer that will sit above the nand(8) device and perform BIO_DELETE operations when required? > TODO: > * ECC support. > * Add GEOM attributes to get information about the NAND device out, > eg. Block size, OOB data, etc. > * Test the erase code. > * Add support for real hardware. > * Read the parameter page on parts that support it to get the required > information. > > Andrew > > [1] http://fubar.geek.nz/files/freebsd/nand/freebsd-nand-20090405.tar.gz What about putting this information to the wiki? Seems like a good start for anyone who'll be working on the real hardware. And thanks again for the great work! - -- Stanislav Sedov ST4096-RIPE -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAknZvC4ACgkQK/VZk+smlYFgGQCeP/sXZcjhEBrvHQtdcO+iPC6R yKoAnisUV9Jmfagx4sQCcE5wWGABI/y0 =cmW/ -----END PGP SIGNATURE----- !DSPAM:49d9bc2e967004191370449!
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