IMX6硬件設計指南與硬件啟動

i.MXHWDesignGuide

andBoardBringUp

FAE:LindaLinConsolidatedbyi.MXFAE(Draftver0.2)Aug.6,2014Topics1.i.MX6HWDesignReferenceBoard.(gothroughschematicofi.MX6SDP)2.i.MX6HardwareDevelopmentGuide.(IMX6DQ6SDLHDG.pdf)3.i.MXHWCheckingList.(Excelfileofi.MX6HWDesignCheckingList)4.i.MX6XPowerdesign5.DDRCalibrationandStressTest.6.IOMuxTool7.i.MX6XHardwarebringupi.MX6HWDesignReferenceBoard.RelatedHardwarematerialsSABRESDP_DESIGNFILES.zip/SABRE_AI_DESIGNFILES.zip:SDP/AIboardschematic/layout.IMX6DQ6SDLHDG.pdf:i.MX6Xhardwaredesignguide,includeschematic/layoutcheckpoints,iomuxtools,bringup,IBIS/BSDL,RMIIinterface.IMX6DQ/DLS_A/I/CEC.pdf:i.MX6XDatasheet:includechipsetelectricalCharacteristicslikethevoltagerange,MaxcurrentandPowersequence.IMX6DQ/DLS_RM.pdf:i.MX6XChipsetreferencemanual.AN4509:i.MX6DQPowerConsumptionMeasurement.AN4576:i.MX6DLSPowerConsumptionMeasurement.IMX6_IOMUX_TOOL:iomuxconfigurationtools.Mfgtools-Rel-4.1.0_130816_MX6Q_UPDATER.tar.gz:MFGtools.L3.0.35_4.1.0_130816_images_MX6.tar.gz:linuxdemoimage.HWDesignCheckingListfori.Mx6Rev2.6.xlsx:i.MX6Xhardwarechecklist,downloadfrom:DDR_Stress_Tester_v1.0.3.zip:DDRtesttools,downloadfrom:i.Mx6DQSDLDDR3ScriptAid:DDRconfigurationtools,Downloadfrom:Freescalei.MX6DRAMPortApplicationGuide-DDR3

i.MX6ReferenceSolutionRelatedMaterialSelect“SABREPlatformforSmartDevices”HardwareMaterial(Schematic,PCB,Gerber.etc);SABREBoardforSmartDevices(SDB)i.MX6Quad1GhzCortex-A9ProcessorCanbeconfiguredasi.MX6DualFreescaleMMPF0100PMIC1GBDDR3memory(nonterminated)3”x7”8-layerPCBDisplayconnectors2xLVDSconnectorsConnectorfor24bit4.3”

800x480WVGAwith

4-wiretouchscreenHDMIConnectorAudioWolfsonAudioCodecMicrophoneandheadphonejacksExpansionConnectorCameraCSIportsignalsI2C,SSI,SPIsignalsConnectivity2xFull-sizeSD/MMCcardslot22-pinSATAconnector10/100/1000Ethernetport1xhigh-speedUSBOTGportmPCI-econnector

DebugJTAGconnectorSerialtoUSBconnectorAdditionalFeatures3-axisFreescaleacceleCompassPowersupplyNobatterychargerOSSupportLinuxandAndroidJBfromFreescale;Others:supportby3rdpartiesToolsSupportLauterbach,ARM(DS-5),Macraigordebug/IDEtoolchainPartNumbers: MCIMX6Q-SDB($399)Display(9.7”): MCIMX-LVDS1($499)Display(4.3”): MCIMX28LCD($199)SABREPlatformforSmartDevices(SDP)i.MX6Quad1GHzCortex-A9Processori.MX6DualLite1GHzCortex-A9ProcessorFreescaleMMPF0100PMIC1GBDDR3memory(nonterminated)3”x7”8-layerPCBDisplayconnectorsNative1024x768LVDSdisplay

(comeswithkit)2ndLVDSconnectorConnectorfor24bit4.3”

800x480WVGAwith

4-wiretouchscreenHDMIConnectorMIPIDSIconnectorAudioWolfsonAudioCodecMicrophoneandheadphonejacksDual1WSpeakersExpansionConnectorEnablesparallelLCDorHDMIoutputCameraCSIportsignalsI2C,SSI,SPIsignalsConnectivity2xFull-sizeSD/MMCcardslot22-pinSATAconnector10/100/1000Ethernetport1xhigh-speedUSBOTGportmPCI-econnector

DebugJTAGconnectorSerialtoUSBconnectorAdditionalFeatures3-axisFreescaleaccelGPSreceiverAmbientLightSensoreCompassDual5MPCamerasPowersupplyBatteryChargerBatteryconnectorsOSSupportLinuxandAndroidJBfromFreescale;Others:supportby3rdpartiesToolsSupportLauterbach,ARM(DS-5),Macraigordebug/IDEtoolchainPartNumbers: MCIMX6Q-SDP($999)

MCIMX6DL-SDP($999)Display(4.3”): MCIMX28LCD($199)WiFi: SilexWiFimoduleSABREPlatformforAutomotiveInfotainment(AI)PowerandMemoryFreescaleMMPF0100PMIC2GBDDR3memory(i.MX6Dual/Quad)1GBDDR3memory(i.MX6Solo)32GBParallelNORFlashNANDSocketDisplayLVDSconnectorcompatiblewithMCIMX-LVDS1ParallelRGBdisplayinterfaceHDMIoutput

connector

DebugJTAGconnectorDebugUARTconnectorConnectivityandExpansionSDCardSlotHighSpeedUSBOTGEthernetSATAMIPICSIPCIeMLB150INICconnector281-pinMXMcardedgeconnectorformainboardexpansionCanbereusedfromi.MX53SABREAIConnectivityandExpansionSDcardslot(WiFimoduleorSD)BluetoothorBluetooth+WiFiheaderAM/FMtunerheaderSiriusXMModuleheader(de-pop’’d)GPS(UART)moduleconnector2xCANDualHighSpeedUSBHostconnectorsMLB25/50INICconnectorSPINORflash

DisplayI/OLVDSconnectorcompatiblewithMCIMX-LVDS1AnalogVideoInputLVDSInputAudioCirrusmultichannelaudiocodecUpto8outputsDualmicrophoneinputsStereoLineLevelInputSPDIFreceiverOSSupportLinuxOthers:futuresupportby3rdpartiesCPUCardDetailsBaseBoardDetailsPartNumbersBaseBoard: MCIMXABASEV1($699)CPUCards: MCIMX6SAICPU1($799) MCIMX6QAICPU1($799)Display: MCIMX-LVDS1($499)i.MX6SMARTDEVICESYSTEMBlockDiagrami.MX6SMARTDEVICESYSTEMSchematic

Here,openi.MX6SabreSDSchematic,gothroughit.i.MX6HardwareDevelopmentGuide.Suggestion:Pre-design:Studythedatasheet,powerconsumption,schematictounderstandourchipsetrequirement.In-design:Checkthehardwaredesignguide,iomuxtoolsAfter-design:FilltheHWdesigncheckinglist,providetheiomuxdatatosoftware.Hardware-bringup:Checkthepower,powersequence,clock,reset,providethebootconfigurationtosoftware,runddrtest.Debugport:SuggesttohaveUSBOTGPort:Forimageprogram,YoucanuseitasUSBhostport,noproblem.MFGjustuseUSBdevicemode.Debugserialport,i.MX6Xubootcanchangetosupporteveryserialportasdebugport.Sdcardslot:SuggesttokeepatleastoneSdcardslot,itwillhelptousetheSdcardboot,whichcanburnimagedirectlyfromPCtoSdcard.NoneedtodebugtheMFGkernel.Jtag(optional).SuggesttousetheGPIOBoot_cfgbutnotthefuseBoot_cfg.Andbootmodepincanbepulled,becausewecanusethenon-imageboottoenterthedownloadmodei.MX6HardwareDevelopmentGuide

Here,open<<IMX6DQ6SDLHDG.pdf>>,gothroughit.1).DesignChecklist2).i.MX6SeriesLayoutRecommendations3).RequirementsforPowerManagement4).AvoidingBoardBring-upProblemsi.MXHWCheckingList.i.MXHWCheckingListHere,open<<HWDesignCheckingListfori.Mx6Rev2.6.xlsx>>,gothroughit.Clear1Isvoltagelevelmatchedonbus/signal/logic/buffertwoside?Clear2Suggestdrawingpull-upsnearpinareawithpowerdomaindescriptioninschematic.Clear3Pleasetakecareclocksourcecanmeetrequirementofperipheraldevices.(frequency/drivingcapability/jitter/tolorance/fly-timeetc.)Clear4WhenBuffer/Levelshifter/switchareused,SIimpactiononsignalshouldbeconsidered.Clear5ThecontrolsignalspolarityforDirectionSellect/EN/RESETshouldbecheckedforallthedevices.Clear6IOconfigurationshouldbecheckedusingIOMUXToolwhichprovidedbyFreescale.Clear7TheTESTandFAULTmodeinputsoftheindividualchipsshouldbetiedtotheproperlevelfornormaloperation.Clear8Pinsequence/direction/gendersofconnectorshouldbeconfirmedwithMechnicalconsideration.Clear9Pull-upsandvoltagesshouldbeverifiedforOC/ODsignals.Clear10Properpull-upandpull-downresistorvaluesprovidedtoavoidexcesssourcingorsinkingcurrent.Clear11Thepolaritiesofthecapsanddiodesconnectedto–vevoltagesshouldbeverified.Clear12Suggestallactivelowsignals--include“_B”atendofthesignalnetnameandallclocksignalsinclude“CLK”aspartofnetname.Clear13Pleaseconfirmifallpowersourcehavesufficientpowercapacityandgoodenoughripplenoiselevelforrequirementofpowerinput.Clear14Poweron/offsequencingshouldbeverifiedwhenmultiplepowersourcesareused.Clear15ThecurrentratingofDiodes/Inductorsusedinthepowersupplyandotherhighcurrentsectionsshouldbeprovidedproperly.Clear16PleasepayattentiononEMI/EMC/ESD/Ligteningconsideration(decouplingcaps/TVSdiodes/chokes/filters/beads/fueseetc).Clear17Pleaseconfirmifunusedpinsareconfiguredproperlyfollowingformalrecommend.Clear18Pleaseconfirmbootmodeandconfigurationpinsaresetproperlyandcanmeettheactualbootrequirment.Clear19Pleasetakecarewatchdog/cold/keyresetsystemdesign,PMICandbootdevicealsoshouldberesetatsametime.i.MX6XPowerdesigni.MX6PowerRelateddocIMX6DQCEC.pdf:i.MX6Dual/6QuadApplicationsProcessorsforConsumerProductsAN4509.pdf:i.MX6Dual/6QuadPowerConsumptionMeasurementIMX6SDLCEC.pdf:i.MX6Solo/6DualLiteApplicationsProcessorsforConsumerProductsAN4576.pdf:i.MX6DualLitePowerConsumptionMeasurementSDPschematic(PF0100):SPF-27392.pdfSaberliteschematic(DiscreteDCDC)(fromboundarydevices)IMX6DQ6SDLHDG.pdf(optional):DesignChecklist:Table2-6.PoweranddecouplerecommendationsPowerSupply,andCommonHardwareDesigni.MX6System-PowerDesignConsiderationsSystemPowerRequirements(oneachpowerrail)MaxCurrentrequirementVoltagerangeSystemOver-VoltageProtectionPowerOnSequencingSystemcontrolfunctionsLayout&decouplei.MX6PowerRailRequirementsToFunctionproperly,thei.MX6Processorrequiresninedifferentpowerrails(Somemaybecombined)VDDARMPowertoARMCoresAllowedvoltage:0.9V–1.5VVDDSOCVPPowertoonchipSystemPeripherals(VDDSOC_CAP):HDMIPHY,SATAPHY,PCIEPHY,&ARMCoreCachePowertoImageprocessingmodules(VDDPU_CAP)VPU,GPU2D,GPU3D,OpenVGAllowedvoltage:0.9V–1.5Vi.MX6PowerRailRequirements(con)VDDHIGHVPHPowertoonchipSystemPeripherals(VDDHIGH_CAP)MIPI,HDMI,SATA,PCIE,LVDS,USB,PLLsPowertomiscPeripherals(NVCC_PLL_OUT)USD,PLLs,24MHzOsc.SharedpowerofSNVSmoduleAllowedvoltage:2.7V–3.3VVSNVS32KHzOscillatorandSRTCfunctionsSharedpowerofSNVSmoduleAllowedvoltage:2.8V–3.3Vi.MX6PowerRailRequirements(con)USB_H1/OTG_VBUSPowertoUSBPHYAllowedvoltage:4.4V–5.25VNVCC_DRAMPowersupplyforDRAMmemoryAllowedvoltage:1.14V–1.575V(DependsontypeDRAM)EthernetIOpins(NVCC_RGMII)Allowedvoltage:1.14–1.9VGeneralIOpins(NVCC_)Typically1.8Vor3.3VAllowedvoltage:1.65V–3.6Vi.MX6PowerRailRequirements-SummaryInatypicalapplication,sixdifferentvoltagesarerequiredfortheprocessortofunction:FunctionTypicalVoltageVDDARM,VDDSOC1.375VVDDHIGH,VSNVS3.0VUSB_VBUS5.0VNVCC_DRAM1.5VNVCC_3.3V3.3VNVCC_1.8V1.8Vi.MX6PowerRequirements–VDDARM,VDDSOCDatasheetMaxRequirementsforVDDARM:3920mADatasheetMaxRequirementsforVDDSOC:1890mATypicalMaximumCurrentRequirements(AN4509):Showingthreeseparatevideooutputs1080pVideoplaybackHDMI1080pVideoplaybackIPUParallelport(LCD)3DgraphicsthroughLVDSportVDDARM:1625mAVDDSOC:1250mAi.MX6PowerRequirements–VDDHIGH,VSNVSDatasheetMaxRequirementsforVSNVS:300uAPullUpresistorsonVSNVSwilladdtocurrentrequirementsDatasheetMaxRequirementsforVDDHIGH:160mATypicalMaximumCurrentRequirements(AN4509):VDDHIGH:85mAi.MX6PowerRequirements–DRAM,IOPinsDatasheetMaxRequirementsforDRAM:1900mATypicalMaximumCurrentRequirements(AN4509):DRAM:1390mADatasheetrequirementsforIOPins,use:I(A)=NxCxVx(0.5xF)N–NumberofIOpinssuppliedC–Equivalentexternalcapacitiveload(Farads)V–IOvoltage(Volts)(0.5xF)–Datachangerate,whereF=Frequency(Hz)Typical=2-3mAfora3.3VpinSummaryPowerRequirementsPowerRailVoltageTypicalMaximumVDDARM1.375V1625mA3920mAVDDSOC1.375V1250mA1890mAVDDHIGH2.8V85mA160mAVSNVS3.0V-300uADRAM1.5V1390mA1900mAUSB5.0V500mA530mAI/OPins3.3V300mA500mA*I/OPins1.8V50mA275mA**MaximumvaluesaremutuallyexclusiveTypicalConsumerDevicePowerRequirementsFunctionVoltageTypicalMaximumSDCard3.3V100mAWIFI/BT3.3V1000mA3G/4GModem3.3V2000mA3000mALVDS3.3/5V300/370mAHDMI5V50mAEthernet3.3V130mAAudio1.8/5V40/100mA80/530mASATA5V500-1000mA1500mAeMMC3.3V100mA200mACAN5V70mAGPS1.5/3.3V20/100mACamera1.5/1.8V150/20mAGrandTotalPowerRequirementsVoltageTypicalFullPower1.375V1875mA5800mA1.5V1500mA2300mA1.8V100mA350mA3.0V160mA200mA3.3V2000mA5000mA5.0V1500mA3300mAi.MX6System-PowerDesignConsiderationsTotalSystemPowerRequirementsTypicalSystemrequirements(5Vsource):2.9ATypicalSystemrequirements(3.7Vsource):4.1ASystemOver-VoltageProtectionSelectPowercomponentswithhighvoltagetoleranceDesignOver-Voltageprotectionsub-systemUserbatterychargingcircuitwithprotection.PowerOnSequencingSystemcontrolfunctionsStand-by,reducedpoweroptionsi.MX6System-PowerOn/OffSequencingPowerOnSequencingVDD_SNVS_IN=<VDDHIGH_IN<anyotherpowersupply(FSLsuggestVDDHIGN_INpowerwithVDD_SNVS_INorinstep2)VDDARM_IN<=(VDDSOC_IN-1ms);Vvddarm_cap<=(Vvddsoc_cap+50mV):IfVDDARM_INandVDDSOC_INareconnectedtodifferentexternalsupplysourcesPowerOffSequencingN/ANotes:Needtoensurethatthereisnobackvoltage(leakage)fromanysupplyontheboardtowardsthe3.3Vsupply(forexample,fromtheexternalcomponentsthatuseboththe1.8Vand3.3Vsupplies)USB_OTG_VBUSandUSB_H1_VBUSarenotpartofthepowersupplysequenceandmaybepoweredatanytimeIMX6DQ6SDLHDG:Table2-6.PoweranddecouplerecommendationsVGEN5forVDDHIGH_INandincreaseto3VtoalignwithdatasheetOnlyone22μFbulkcapacitorshouldbeconnectedtoeachoftheseon-chipLDOregulatoroutputs:VDD_ARM/23/SOC/PU_CAPasnearaspossiblewithpins/vias.Thedistanceshouldbelessthan50milbetweenbulkcapandVDD_xx_CAPpins;ripplenoiseshouldbelessthan5%Vp-pofsupplyvoltageaveragevalueNVCC_LVDS2P5mustbepowered-onevenwhennotusingtheLVDSinterface becauseTheDDRpre-driverssharetheNVCC_LVDS2P5powerrailwiththeLVDSinterface33i.MX6Dual/Quad:5vINPUT+PFUSE100:SDP34i.MX6Dual/Quad:5vDiscretePowerDevelopTools

DDRStressTestDDRStressTestToolWhatisDDRStressTesterkit?Itisdownloadabletestapplicationarchitecture.AprogramrunningonPC(DDR_Stress_Tester.exe,whichrunningonCommandPromptwindow)willdownloadthetestimagetotargetboard’sIRAMwiththehelpofUART/USBconnection.ThetestimagewilldotheDDRstresstestandtheresultwillbesenttoPCthroughUART/USBandbeprintedontheCommandPromptwindow.Formx6dq,mx6dlsormx6sl,UARTisnotsupported.Supportmx53,mx51,mx6dq,mx6dlsandmx6sl.DDRStressTestToolcont.TestLog

LinkDevelopTools

IOMuxToolIOMUXToolApplicationWindowOverview

DownloadandInstalltheMicrosoft.NETFramework4.0SelectModulesandSignalsforBoardChecktheUARTS:UART1,UART2andUART3.ExpandallsignalsunderUART3.AccessingMuxed-SignalInfoAccessingMuxed-SignalInfoResolveConflictingSignalsSelectALT4–EIM_D30(J20)forUART3/CTS.SelectALT4–EIM_D31(H21)forUART3/RTS.SelectALT2–SD4_CLK(E16)forUART3/RXD_MUX.SelectALT2–SD4_CMD(B17)forUART3/TXD_MUX.AddingCommentsforClarityRight-clicktheUART2/TXD_MUXrowintheSignalstabtobringupthecontextmenu.Clickingonthemenuwillbringupatextentryfieldwheretheusermayentertext.AddingCommentsforClarityBallDiagramViewPads“Spreadsheet”ViewConfiguringIOMUXCRegistersSelectUART3/RXD_MUXintheleft-handpane.AlloftheIOMUXCRegistersassociatedwiththeAD4_CLK(E16)padareshownontheRegistersTabintheright-handpane.DragaSignaltoanotherModuleRenameSignaltoMatchSchematicsCAN1ModulewithAllSignalsCommentsauto-generatedtodenoteoriginalModule/Signal.CodeReflectsAddedSignalsBasicCodeStyleasaTooltip.GenerateConfigurationCodeSeveralCode-StylesavailableintheCodeMenu.ExamplesareshownintheUser’sGuide.Click“GenerateCode”tocreatethefilesforthecurrentdesign.Tryiti.MX6XHardwarebringupi.MX6XHardwarebringup:Doc&Tools.IMX6DQ6SDLHDG.pdf:Chapter8AvoidingBoardBring-upProblems.IMX6XRM.pdf:Chapter7SystemBoot,Chapter60:SystemResetController(SRC)MFGtools,DDRtesttools.USBline;有源可限流電源，萬用表，示波器i.MX6XHardwarebringup:Step1目視檢查檢查主要器件是否有錯貼的情況，比方說二極管，三極管，有沒有安裝位置反向或旋轉的問題?？梢栽赑CBA時使用X光檢查，有條件的使用BSDL檢查來確認焊接與連線i.MX6XHardwarebringup:Step2

電源檢查使用萬用表，先空板檢查每個電源有沒有對地短路的情況。使用限流電源上電，檢查i.MX6X每路電源的電壓是否符合我們datasheet要求，量測電壓是要求在電源輸出端和i.MX6X電源輸入端(越近越好，如在濾波電容上量測)都量測一下，以防止IR跌落。VDD_ARM/SOC_IN供給i.MX6X內部邏輯電路，需要仔細檢查，VDD_SNVS_IN，NVCC_JTAG,NVCC_DRAM也對正常啟動很重要，NVCC_LVDS2V5也供給了DDRI/OPads,也必須要正常供給。i.MX6X在各路電源穩(wěn)定后，才能釋放reset(POR_B)。如前電源上電時序要求，檢查上電時序。i.MX6XHardwarebringup:Step3

時鐘檢查一般在電源電壓正確，無跌落，24Mhz和32K晶體會自動起振?？墒褂檬静ㄆ髁繙y這兩個時鐘，如果24Mhz不工作，那么系統(tǒng)不能啟動，如果外部沒有32K，或32K不工作，那么i.MX6X會自動使用內部晶振，但根據newerrataIM6DQCERev.4,07/2014:ERR007926ROM:32kHzinternaloscillatortiminginaccuracymayaffectSD/MMC,NAND,andOneNANDboot,由于內部romcode的GPT使用這個時鐘，而GPT被用于外設訪問中一些event和timeout控制，所以不穩(wěn)定的時鐘有可能導致romcodes讀取外設失敗，所以建議連接外部32K.i.MX6XHardwarebringup:Step4準備bringup文檔一般硬件工程師需要準備三份文檔描述板級設計電源文檔:每一路電源的源，供給到?輸出，輸入電壓，測量點,時序。如SDPschematic:i.MX6XHardwarebringup:Step4準備bringup文檔IOMUX文檔：可以使用iomux工具導出，也可以手動準備,內容最好包括：以方便軟件工程師配置IOMUX，這個表應該至少包括所有數(shù)字管腳,軟件工程師根據這個表來配置iomux文件:arch\arm\mach-mx6\Board-mx6q_sabersd.hstaticiomux_v3_cfg_tmx6q_sabresd_pads[]={… /*UART1fordebug*/ MX6Q_PAD_CSI0_DAT10__UART1_TXD,//CSI0_DAT10為管腳名，UART1_TX會功能名。Notes:1i.MX6X根本所有的可做為GPIO的pin在reset狀態(tài)下都是iomux設為gpio,gpio設為輸入高阻，iopad設為100K上拉的.2i.MX6X的datasheet中也列出了一些例外:Formostofthesignals,thestateduringresetissameasthestateafterreset,However,therearefewsignalsforwhichthestateduringresetisdifferentfromthestateafterreset:EIM_A16~A25,EIM_DA0~DA15,EIM_EB1~EB3,EIM_LBA/RW/WAIT,GPIO_17/19,KEY_COL0，請注意有一些pin是用于bootgpio的.管腳名腳管序號網絡名IOMUX用于CSI0_DATA10M1UART1_TXALT3UART1_TXi.MX6XHardwarebringup:Step4準備bringup文檔Boot_Cfg文檔：說明Boot_cfg配置，以SDP的eMMCboot為例FuseSBMR1定義GPIO管腳默認值設置值默認值定義BOOT_CFG1[7:6]Bit7_6啟動設備接口EIM_DA7_6000101:BootfromUSDHCBOOT_CFG1[5]bit5SD/MMCSelEIM_DA5010:SD/eSD/SDXC;1:MMC/eMMCBOOT_CFG1[4]bit4FastBootSuppoEIM_DA4000:NormalBoot;1:FastBootBOOT_CFG1[3:2]bit3_2SD/MMC速度模式EIM_DA3_20000MMC:0x:HighSpeedMode;1x:NormalSpeedModeSD:0x:High/Normal;

10:SDR50;

11:SDR104BOOT_CFG1[1]bit1SDPowerCycleeMMCResetEIM_DA100MMC:0:eMMCresetdisabled.1:eMMCresetenabledviaSD_RSTpad(onUSDHC3/4)SD:0:Nopowercycle1:PowercycleenabledvisSD_RSTpad(onUSDHC3/4)BOOT_CFG1[0]bit0SDLoopbackClockSourceSel(SDR50/104only)EIM_DA0000:throughSDpad1:directBOOT_CFG2[7:5]bit15_13BusWidth/SDCalibrationStepEIM_DA15~13000010SD:BusWidth:xx0:1bit;xx1:4bit.SDCalibrationStep:00x~11x:1~3delaycellsMMC000~010:1,4,8bit.101~110:4,8bitDDR(MMC4.4)i.MX6XHardwarebringup:Step4準備bringup文檔SDP的BootSelect為:所以eMMC啟動的SBMR1=0Xxxx5860FuseSBMR1定義GPIO管腳默認值設置值默認值定義BOOT_CFG2[4:3]Bit12_11啟動設備接口EIM_DA12_11001100~11:USDHC1~4BOOT_CFG2[2]Bit10DLLOverride(eMMC)EIM_DA10000:BootROMdefault;1:ApplyvalueperfuseMMC_DLL_DLY[6:0]BOOT_CFG2[1]Bit9BootACKdisable/PulldownDuringPowerCycleEnableEIM_DA900MMC:0:BootACKEnabled;1:BootACKDisabled.SD:0:UsethedefaultSDpadsettingsduringpowercycle.1:SetPulldownonSDpadsduringpowercycleBOOT_CFG2[0]bit