Hi Shawn, > Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> hat am 7. August 2016 um 04:07 > geschrieben: > > > 在 2016/8/6 22:18, Stefan Wahren 写道: > > Hi Marek, > > > >> Marek Vasut <marex@xxxxxxx> hat am 6. August 2016 um 15:14 geschrieben: > >> > >> > >> On 08/06/2016 02:55 PM, Stefan Wahren wrote: > >>> This patch based on the work of Fabio Estevam: > >>> "[PATCH v2] mmc: core: Do not set mmc voltage to 1.8V when > >>> 'no-1-8-v' is present" > >>> > >>> It adds the support for 3.3V only DDR MMC hosts. > >> > >> Do such cards even exist ? Do you have a link where I can find some ? > > > > i never said anything about SD cards. I mean eMMC modules which usually have > > 8 > > data pins like this one [1]. > > > > Please don't blame me if it's not compatible to i.MX28. It's only an > > example. > > > > [1] - > > http://datasheet.octopart.com/THGBM3G4D1FBAIGH2H-Toshiba-datasheet-20748880.pdf > > > I download the datasheet you mentioned, and I explicitly see it > describe 1V8 everywhere, especially for the section of "ELECTRICAL > CHARACTERISTICS". > > I never see one eMMC claiming DDR52 capability but doesn't support 1V8 > so far. Could you kindly share me the part number of the eMMC you are > using? :) sorry the subject line is misleading. The capability flag is about the host not about the MMC itself. There are hosts which doesn't support 1.8V. I will clarify this in the next version. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
