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Date: Tue, 15 May 2012 20:10:01 +0200 From: Richard Weinberger <richard@....at> To: Subodh Nijsure <snijsure@...d-net.com> CC: linux-mtd@...ts.infradead.org, Heinz.Egger@...utronix.de, tglx@...utronix.de, tim.bird@...sony.com, linux-kernel@...r.kernel.org, dedekind1@...il.com Subject: Re: [RFC v4] UBI: Fastmap support (aka checkpointing) Hi Subodh, Am 15.05.2012 19:48, schrieb Subodh Nijsure: > Hello Richard, > > On 05/15/2012 10:11 AM, Richard Weinberger wrote: >> v1: https://lwn.net/Articles/481612/ >> v2: https://lwn.net/Articles/496586/ >> v3: Didn't release it to linux-mtd > Will kernel that has older UBI drivers be able to mount and update the > UBI volumes that have been created with checkpointing feature? Of course! > Say I have bootrom that has 3.0.X kernel that has no knowledge of UBI > checkpointing, and my flash /dev/mtd2 has UBI volume with checkpointing > enabled. Will this bootrom be able to attach /dev/mtd2 and mount UBI > volume and read/write files on it? Sure! Your bootrom will scan the UBI volume and detect two unknown internal volumes with compat=delete in their volume headers. So, it will delete the two fastmap volumes and continue scanning. It can alter the volume and so on. Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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