From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Thu, 18 Jul 2013 17:10:05 +0200
Subject: [U-Boot] [RFC][DFU] Unification of dfu_alt_info alt settings
	description + command execution
In-Reply-To: <20130718080926.27474380DF1@gemini.denx.de>
References: <20130716173521.3dd7ec9e@amdc308.digital.local>
	<51E77A1D.90403@denx.de>
	<20130718080926.27474380DF1@gemini.denx.de>
Message-ID: <201307181710.05980.marex@denx.de>
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To: u-boot@lists.denx.de

Hi,

> Dear Heiko Schocher,
> 
> In message <51E77A1D.90403@denx.de> you wrote:
> > > Try "nand write.trimffs" to write UBI images produced with ubinize .
> > 
> > This solves not the erasecounter problem, or?
> > 
> > For UBI we need something like this:
> > http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo
> > 
> > But I am not an UBI expert. It is possible I overlook something
> > obvious ...
> 
> No, you don't.  Devices managed by UBI should never be erased by
> other, non-UBI-aware tools.

I based my reply on the following commit in U-Boot and the fact that 
write.trimffs is used to flash UBI images. Maybe I was wrong?

commit c9494866df835bcee68e17339aec1090faa704da
Author: Ben Gardiner <bengardiner@nanometrics.ca>
Date:   Tue Jun 14 16:35:07 2011 -0400

    cmd_nand: add nand write.trimffs command
    
    Add another nand write. variant, trimffs. This command will request of
    nand_write_skip_bad() that all trailing all-0xff pages will be
    dropped from eraseblocks when they are written to flash as-per the
    reccommended behaviour of the UBI FAQ [1].
    
    The function that implements this timming is the drop_ffs() function
    by Artem Bityutskiy, ported from the mtd-utils tree.
    
    [1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo

Best regards,
Marek Vasut