linux-kernel - Re: UBI fastmap updates

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Message-ID: <50200096.1070002@nod.at>
Date:	Mon, 06 Aug 2012 19:36:22 +0200
From:	Richard Weinberger <richard@....at>
To:	artem.bityutskiy@...ux.intel.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, Heinz.Egger@...utronix.de,
	thomas.wucher@...utronix.de, shmulik.ladkani@...il.com,
	tglx@...utronix.de, tim.bird@...sony.com, Marius.Mazarel@...l.ro,
	nyoushchenko@...sta.com
Subject: Re: UBI fastmap updates

Am 02.08.2012 16:58, schrieb Artem Bityutskiy:
> On Mon, 2012-07-09 at 14:18 +0200, Richard Weinberger wrote:
>> This is the next round of UBI fastmap updates.
>> It fixes all issues pointed out by Shmulik. :-)
> 
> Hi Richard,
> 
> when I try to attach mtdram (NOR flash), UBI fails:

Fastmap works fine with mtdram and NOR flash.
But if your MTD device has less than UBI_FM_MAX_START (64) PEBs
ubi_io_is_bad() will trigger.
The fix is to disable Fastmap if you have not enough PEBs.

I think we enable fastmap only if a MTD device has more than
UBI_FM_MAX_START*2 PEBs.
Any comments?

Thanks,
//richard


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