From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Sun, 24 Jan 2016 12:07:14 +0100 Subject: [U-Boot] [PATCH] imx: mx6sxsabresd: support emmc In-Reply-To: <20151223031052.GC24788@linux-7smt.suse> References: <1450775035-2339-1-git-send-email-van.freenix@gmail.com> <20151223031052.GC24788@linux-7smt.suse> Message-ID: <56A4B062.9020803@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 Hi Peng, On 23/12/2015 04:10, Peng Fan wrote: > Hi Otavio, > On Tue, Dec 22, 2015 at 09:51:37AM -0200, Otavio Salvador wrote: >> On Tue, Dec 22, 2015 at 7:03 AM, Peng Fan wrote: >>> From: Peng Fan >>> >>> For i.MX6SX SABRESD, USDHC4 can be used for SD and EMMC, default >>> it is used for SD. >>> >>> This patch introduces EMMC pinmux settings and a new macro >>> CONFIG_MX6SXSABRESD_EMMC_REWORK. If the board has been reworked >>> to support emmc, need to enable this macro. >>> >>> Signed-off-by: Peng Fan >>> Cc: Stefano Babic >> >> Is it worth supporting this 'reworked' board? if someone reworks a >> board it is expected to have to rework the BSP of it, as well. > > usdhc4 can be used for SD and emmc. This is the feature of the board, > so I think we need to support it. But there is no way to dynamically check > whether using sd or emmc now, adding the macro for using emmc. I agree with Otavio that this is a very nasty hack, and the hardware developer should provide a way getting the board revision. Anyway, I would not certainly block it, as it concerns just this board, but I ask if it is not better to let decide to an environment variable if eMMC must be activated. Advantage is to have a single U-Boot binary for both boards, disadvantage is that it coul be set for the wrong board revision, too. But if USDHC4 was not used anymore, this drives just to a not found eMMC. Both ways are hacks, I fully agree, but CONFIG_MX6SXSABRESD_EMMC_REWORK remains undocumented at all, too. What do you think ? Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, Managing Director: Wolfgang Denk 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 =====================================================================