Hello Prasad, Which revision of the BeagleBoard are you using? And which type and size of MMC/SD/MMCplus/SDHC card are you using ?
What might happen is UEFI fails to reset the MMC controller to start again the MMC state machine from the MMC Identification mode after u-boot did it. There are two solutions: 1. Skip u-boot from your boot process and directly start from UEFI. See instructions there: https://sourceforge.net/apps/mediawiki/tianocore/index.php?title=BeagleBoard Pkg 2. Ensure the MMC state machine is correctly reset by: - doing a platform specific MMC reset in the function NotifyState() of MMC Host protocol when State == MmcHwInitializationState - ensuring the MMC CMD0 is sent to the MMC controller Olivier From: Prasad Deshpande [mailto:prasa...@samsung.com] Sent: 29 November 2012 12:31 To: edk2-devel@lists.sourceforge.net Subject: [edk2] UEFI on beagleboard with MMC issue Hi, I am trying to bring up UEFI on beagleboard with the help of link: http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=BeagleBoardP age I am able to bring up UEFI shell with the SD Card connected. However if i try to use MMC card, UEFI MmcDxe driver through an error saying no device found. I have enclosed the log for better understanding. Looks like MmcDxe driver code does not support MMC protocol. Please correct if my understanding is wrong. Or is there any way to have MmcDxe driver that supports MMC card protocol? Please help. Regards Prasad Image removed by sender.
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