From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Date: Tue, 22 Sep 2009 22:17:03 +0200 Subject: [U-Boot] [PATCH v2] ppc/85xx: PIO Support for FSL eSDHC Controller Driver In-Reply-To: <1252904203-9129-1-git-send-email-dipen.dudhat@freescale.com> References: <1252904203-9129-1-git-send-email-dipen.dudhat@freescale.com> Message-ID: <20090922201703.C1C6B832E864@gemini.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 Dear Dipen Dudhat, In message <1252904203-9129-1-git-send-email-dipen.dudhat@freescale.com> you wrote: > On some Freescale SoC Internal DMA of eSDHC controller has bug. > > So PIO Mode has introduced to do data transfer using CPU. > In PIO mode data transfer performance will be degraded by a large extent. > > Note: > In PIO mode multiple block read/write requires delay to complete the transfer. > > Signed-off-by: Dipen Dudhat My comments to v1 of the patch still apply. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de We do not colonize. We conquer. We rule. There is no other way for us. -- Rojan, "By Any Other Name", stardate 4657.5