i.MX ProcessorsのトピックIMX8M Problem with 1.8 eMMC https://community.nxp.com/t5/i-MX-Processors/IMX8M-Problem-with-1-8-eMMC/m-p/1045845#M154040 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>we have a small firmware for the Cortex-A53 which handles eMMC access. Until nowhave we tested this functionally without problems. Now there is a new board (8MMINI-BB) which has an SDINBDG4 eMMC attached to SDHC3 Interface. Executing CMD0 works so far (but CMD1 fails.</P><P></P><P>It fails at the "command complete" polling (see Interrupt Status Register) because the command never completes. But we can see in the digitalanalyzer that the eMMC-Device is responding.</P><P></P><P>Note: before CMD1&nbsp; ~90 clock cycles and CMD0 is send</P><P></P><P>My question is: What can be the cause of this behaviour. I guess is has something to do with the 1.8V Bus voltage.</P></BODY></HTML> Wed, 19 Aug 2020 13:31:33 GMT awaken 2020-08-19T13:31:33Z IMX8M Problem with 1.8 eMMC https://community.nxp.com/t5/i-MX-Processors/IMX8M-Problem-with-1-8-eMMC/m-p/1045845#M154040 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>we have a small firmware for the Cortex-A53 which handles eMMC access. Until nowhave we tested this functionally without problems. Now there is a new board (8MMINI-BB) which has an SDINBDG4 eMMC attached to SDHC3 Interface. Executing CMD0 works so far (but CMD1 fails.</P><P></P><P>It fails at the "command complete" polling (see Interrupt Status Register) because the command never completes. But we can see in the digitalanalyzer that the eMMC-Device is responding.</P><P></P><P>Note: before CMD1&nbsp; ~90 clock cycles and CMD0 is send</P><P></P><P>My question is: What can be the cause of this behaviour. I guess is has something to do with the 1.8V Bus voltage.</P></BODY></HTML> Wed, 19 Aug 2020 13:31:33 GMT https://community.nxp.com/t5/i-MX-Processors/IMX8M-Problem-with-1-8-eMMC/m-p/1045845#M154040 awaken 2020-08-19T13:31:33Z Re: IMX8M Problem with 1.8 eMMC https://community.nxp.com/t5/i-MX-Processors/IMX8M-Problem-with-1-8-eMMC/m-p/1045846#M154041 <HTML><HEAD></HEAD><BODY><P>Hi&nbsp;Martin</P><P></P><P>&gt;<SPAN style="color: #51626f; background-color: #ffffff;">Now there is a new board (8MMINI-BB) which has an SDINBDG4 eMMC attached to SDHC3 Interface.</SPAN></P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>board (8MMINI-BB) has not emmc, it has&nbsp;MicroSD attached to SDHC2 (p.10 SPF-31407).</SPAN></SPAN></P><H3 class="" style="color: #20272d; font-size: 20px; margin-bottom: 11px;"><A data-dtmaction="Documents and Software Results - Software Link click" data-dtmsubaction="i.MX 8M Mini Evaluation Kit LPDDR4 Design Files" href="https://www.nxp.com/webapp/Download?colCode=8MMINILPD4-EVK-DESIGNFILES" style="color: #215bd6; background-color: transparent; text-decoration: none;">i.MX 8M Mini Evaluation Kit LPDDR4 Design Files</A><SUP style="font-size: 13.6px;"><SPAN>&nbsp;</SPAN></SUP></H3><P>i.MX8M Mini&nbsp;SOM Board has emmc&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>&nbsp;</SPAN>attached to SDHC3 Interface.</SPAN></P><P>It can be tested using Demo Images and documentation from link</P><P><A class="link-titled" href="https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab" title="https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab">Embedded Linux for i.MX Applications Processors | NXP</A>&nbsp;</P><P>i.MX8M EVK has emmc (p.9 SPF-38820)&nbsp;<SPAN style="color: #51626f; background-color: #ffffff;"><SPAN>&nbsp;</SPAN>attached to SDHC1</SPAN></P><H3 class="" style="color: #20272d; background-color: #ffffff; font-size: 20px; margin-bottom: 11px;"><A data-dtmaction="Documents and Software Results - Software Link click" data-dtmsubaction="Design Files for the i.MX 8M Evaluation Kit (EVKB)" href="https://www.nxp.com/webapp/Download?colCode=MCIMX8M-EVKB-DESIGNFILES&amp;appType=license" style="color: #215bd6; background-color: transparent; text-decoration: none;">Design Files for the i.MX 8M Evaluation Kit (EVKB)</A></H3><P><SPAN style="color: #51626f; background-color: #ffffff;">In general CMD1 (read Operating Conditions Register, used for eMMC initialization) may fail&nbsp;</SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;">due to voltage incompatibility, detailed description can be found in emmc specification.</SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"><A class="link-titled" href="https://www.jedec.org/document_search?search_api_views_fulltext=emmc" title="https://www.jedec.org/document_search?search_api_views_fulltext=emmc">Standards &amp; Documents Search | JEDEC</A>&nbsp;</SPAN></P><P></P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 19 Aug 2020 23:22:15 GMT https://community.nxp.com/t5/i-MX-Processors/IMX8M-Problem-with-1-8-eMMC/m-p/1045846#M154041 igorpadykov 2020-08-19T23:22:15Z