Messages in this thread | | | Date | Fri, 22 Aug 2008 10:35:19 +0200 | From | "Frans Meulenbroeks" <> | Subject | Re: [PATCH 0/2][MTD] Support for > 2GiB MTD devices |
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Suggest you also post this to linux-mtd@lists.infradead.org
2008/8/22 Bruce Leonard <brucle@earthlink.net>: > All, > > Over the course of the last several months, I've been working on adding support to > the kernel for MTD devices that exceed 2GiB in size. In my particular case I > have a need for 8GiB of NAND flash that appears as a single device. I'm now > ready to submit my (first ever!) patch (please be kind :) ). > > Design Details: > The problem - The size field of struct mtd_info is only 32-bits, which limits > the size of mtd devices to 2GiB (0x80000000). > The solution - The size of a device can be calculated buy multiplying the number > of erase blocks by the erase block size. I added a new field to struct > mtd_info to hold the number of erase blocks and an inline function to > determine the device size by returning mtd_info->size if it's non-zero > or returning (mtd_info->num_eraseblocks * mtd_info->erasesize). > > A couple of comments. First and foremost, these patches don't completely change > the MTD layer. Due to my in-experience outside of what I was focused on > (NAND/UBI/UBIFS/MTDCHAR) I felt it was best if I restricted my changes to what I > knew. If the community feels I need to take these changes into the rest of the > MTD layer please advise. Secondly, there were changes that I needed to make in > mtd-utils, but I again only focused on the UBI sub-set. mtd-utils no longer builds > because of the changes (though the UBI tools still build). But I really do NOT > feel qualified to make changes to the rest of mtd-utils as they're tools I don't > use and don't understand and I don't want to accidentaly break something I don't > understand. The changes in mtd-utils are the same changes as in > .../include/linux/mtd/mtd.h and .../include/mtd/mtd-abi.h. If anyone has a > suggestion as to how I should handle mtd-utils I would appreciate it. > > Thanks again to everyone who's answered my endless stupid questions. > > Bruce > > -- > 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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