From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Fri, 24 Jun 2016 19:26:44 -0400 Subject: [U-Boot] [PATCH] cmd, nand: add an option to disable the verification when writing in raw mode In-Reply-To: <1465980138-18496-1-git-send-email-boris.brezillon@free-electrons.com> References: <1465980138-18496-1-git-send-email-boris.brezillon@free-electrons.com> Message-ID: <20160624232644.GJ19080@bill-the-cat> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Wed, Jun 15, 2016 at 10:42:18AM +0200, Boris Brezillon wrote: > Modern NANDs do not guarantee that data written in raw mode will not > contain bitflips just after writing them. This is fine since the number > of bitflips should be rather low and thus fixable by the ECC engine, > but since we are reading data in raw mode to verify if they match the > input data we cannot prevent failures if some bits are flipped. > > The option of using standard mode to verify the data is not acceptable > either, since one of the usage of raw mode is to allow flashing images > that do not respect the standard NAND page layout or the default ECC > config (this is the case on Allwinner platforms, where the ROM code > tests several hardcoded configs, which are not necessarily matching the > NAND characteristics). > > Add an extension to the nand write.raw command allowing one to disable > the verification step. > > Signed-off-by: Boris Brezillon Reviewed-by: Tom Rini -- Tom -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: