linux-kernel - Re: [PATCH] UBI: add minimal amount of reserved erase blocks in Kconfig

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Message-ID: <1340982422.3070.226.camel@sauron.fi.intel.com>
Date:	Fri, 29 Jun 2012 18:07:02 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Richard Genoud <richard.genoud@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: [PATCH] UBI: add minimal amount of reserved erase blocks in
 Kconfig

On Fri, 2012-06-29 at 16:57 +0200, Richard Genoud wrote:
> 2012/6/29 Artem Bityutskiy <dedekind1@...il.com>:
> >> I was thinking that instead of giving to ubiattach the MBB, we could
> >> give it the MBB percentage (maximum bad blocks percentage of the whole
> >> flash device).
> >> From this % and the whole flash size, we get the MBB number, and set
> >> beb_rsvd_level for each MTD part.
> >
> > Well, I thought that it may be not flexible enough for some people,
> > because you cannot give 1.5%, since flaoting-point arithmetic in the
> > kernel is not used.
> So there's 2 ways to bypass that :
> - use per-1024 instead of percent => the default value would be 20.
> - let ubiattach do the conversion from MBB% to MBB
> I like the 1st one because it gives a number close to what we have in
> the datasheets.
> What do you think ?

Yeah, probably, centi-percents would be OK.

-- 
Best Regards,
Artem Bityutskiy

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