From: Jan Dąbroś <j...@semihalf.com> In order to force SD stack to use PIO mode, PcdSdForcePioMode flag is added. If it's set, driver will use this mode regardless controller capabilities.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jan Dabros <j...@semihalf.com> Signed-off-by: Marcin Wojtas <m...@semihalf.com> --- MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf | 2 ++ MdePkg/MdePkg.dec | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf b/MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf index 6f5e6ca..31b78ed 100644 --- a/MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf +++ b/MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf @@ -64,3 +64,5 @@ ## BY_START gEfiDevicePathProtocolGuid +[FeaturePcd] + gEfiMdePkgTokenSpaceGuid.PcdSdForcePioMode diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec index 458d568..b05f3ed 100644 --- a/MdePkg/MdePkg.dec +++ b/MdePkg/MdePkg.dec @@ -1689,6 +1689,13 @@ # @Prompt Validate ORDERED_COLLECTION structure gEfiMdePkgTokenSpaceGuid.PcdValidateOrderedCollection|FALSE|BOOLEAN|0x0000002a + ## Indicates if PIO mode should be used for data transfer with SD devices. + # If this flag isn't set, DMA modes will be used. + # TRUE - PIO mode will be forced for transfer with SD devices. <BR> + # FALSE - PIO mode won't be forced for transfer with SD devices. <BR> + # @Prompt Force PIO mode for data transfer with SD devices + gEfiMdePkgTokenSpaceGuid.PcdSdForcePioMode|FALSE|BOOLEAN|0x10000029 + [PcdsFixedAtBuild] ## Status code value for indicating a watchdog timer has expired. # EFI_COMPUTING_UNIT_HOST_PROCESSOR | EFI_CU_HP_EC_TIMER_EXPIRED -- 1.8.3.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
