6578 2014-07-25 17:21:53 +0000 SD DDR50 support should be disabled by default in the BIOS settings 2014-08-07 06:35:42 +0000 1 1 12 Hardware Platforms MinnowBoard MAX Firmware minnowmax-edk2 unspecified MinnowBoard Max x86_64 RESOLVED FIXED Low normal Production Release 1 ivan.rouzanov tim.he sjolley.yp.pm warthog9 --- --- Don't know oldest_to_newest 44727 0 ivan.rouzanov 2014-07-25 17:21:53 +0000 Due to the known errata in E3800 SD card support, UHS-I might not work correctly. The suggestion is to make DDR50 support disabled by default in order to reduce the chance for a negative experience for the user/reduce support request volume. http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/atom-e3800-family-spec-update.pdf " SD Card UHS-I Mode is Not Fully Supported Problem: The SD Card Specification rev 3.01 Addendum 1 specifies a relaxed NCRC (Number of clocks to Cyclic Redundancy Check) timing specification for UHS-I (DDR50) mode. Due to this erratum, the SD Host Controller is not fully compatible with this relaxed timing specification. Implication: Using UHS-I mode with SD devices that rely upon relaxed NCRC may cause SD host commands to fail to complete, resulting in device access failures. " 44939 1 warthog9 2014-08-04 05:31:26 +0000 IS there a way we can disable this from the UEFI shell for testing? I've got an UHS-I card that's behaving oddly under Linux, and I'd like to try disabling this and seeing if it resolves the issue. 44945 2 tim.he 2014-08-04 08:04:09 +0000 Yes, you can disable by setup page, please select "Device Manager -> System Setup -> South Cluster Configuration -> Lpss and Scc Configuration -> SD DDR50" to disable it. 44955 3 warthog9 2014-08-04 20:13:37 +0000 ok that's working better, I'll try and get that mentioned on the wiki 44990 4 tim.he 2014-08-07 06:35:42 +0000 The "SD DDR50" item on setup pages is disabled by default.