From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hector Palacios Date: Wed, 21 May 2014 13:52:33 +0200 Subject: [U-Boot] [PATCHv5 09/14] mmc: support the DDR mode for eMMC In-Reply-To: <537C0D84.70006@samsung.com> References: <1400216399-26721-1-git-send-email-jh80.chung@samsung.com> <1400216399-26721-10-git-send-email-jh80.chung@samsung.com> <537B84B6.2040401@digi.com> <537C0D84.70006@samsung.com> Message-ID: <537C9381.9010904@digi.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 05/21/2014 04:20 AM, Jaehoon Chung wrote: > Hi, Hector. > > On 05/21/2014 01:37 AM, Hector Palacios wrote: >> Hi, >> >> On 05/16/2014 06:59 AM, Jaehoon Chung wrote: >>> Signed-off-by: Jaehoon Chung >>> Tested-by: Lukasz Majewski >>> Acked-by: Lukasz Majewski >> >> What platforms did you test DDR mode on? > > I have tested DDR mode with exynos board. > >> I tried this on an Freescale i.MX6 based platform but the driver returned error code COM_ERR (-18) when trying to switch to any of the DDR modes. I guess the fsl_esdhc.c driver needs some adaptation for DDR to work. > > I didn't know how work DDR mode at fsl_esdhc.c.(If you share the host controller TRM, it's helpful to me.) > Host controller also need to change the DDR mode. > > I wonder your board didn't work not to enable the DDR mode? Thank you, yes the fsl_esdhc.c driver does not yet support enabling of DDR mode. I think it should be easy to implement, I believe it is just a question of changing the clock frequency. Best regards, -- Hector Palacios