From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Sun, 23 Sep 2012 20:01:50 +0200 Subject: [U-Boot] [PATCH] KARO TX25: Fix NAND Flash R/W cycle times In-Reply-To: <176388006.2143625.1344434132868.JavaMail.root@advansee.com> References: <176388006.2143625.1344434132868.JavaMail.root@advansee.com> Message-ID: <505F4E8E.5010506@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 08/08/2012 15:55, Beno?t Th?baudeau wrote: > The NAND Flash of the KARO TX25 board is a Samsung K9F1G08U0B with 25-ns R/W > cycle times. However, the NFC clock for this board was set to 66.5 MHz, so using > the NFC driver in symmetric mode (i.e. 1 NFC clock cycle = 1 NF R/W cycle) > resulted in NF R/W cycle times of 15 ns, hence corrupted NF accesses. > > This patch fixes this issue by setting the NFC clock to the highest frequency > complying to the 25-ns NF R/W cycle times specification, i.e. 33.25 MHz. > Applied to u-boot-imx(fix), thanks. Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de =====================================================================