1336S-BRF100-AN-FR4 原因分析
關(guān)于上述問(wèn)題的原因，痞子衡先直接給，這是OTFAD外設(shè)本身的時(shí)鐘小限制，當(dāng)OTFAD被使能時(shí)，如果被加密的app代碼是XIP執(zhí)行，app里做系統(tǒng)時(shí)鐘配置時(shí)要始終保證Core時(shí)鐘高于FlexSPI外設(shè)時(shí)鐘。如果Core時(shí)鐘低于FlexSPI時(shí)鐘，此時(shí)Core去訪問(wèn)加密Flash區(qū)域，OTFAD無(wú)法正常解密，會(huì)導(dǎo)致指令錯(cuò)亂，發(fā)生系統(tǒng)故障。
我們配合上面的i.MXRT1010系統(tǒng)時(shí)鐘樹(shù)來(lái)認(rèn)真分析下OTFAD這個(gè)時(shí)鐘限制問(wèn)題。芯片上電總是從BootROM執(zhí)行，BootROM會(huì)先將Core配置到396MHz，將FlexSPI時(shí)鐘根據(jù)用戶放置在Flash偏移0x400處的FDCB里的設(shè)定配到30MHz - 200MHz不等，再讀取Flash偏移0地址處OTFAD DEK KeyBlob數(shù)據(jù)使能OTFAD，然后讀取IVT等頭信息去跳轉(zhuǎn)到App。很顯然只加密IVT部分根本不受OTFAD限制的影響，這部分解析是在BootROM里完成的，BootROM里時(shí)鐘配置符合OTFAD時(shí)鐘限制要求。
// BootROM里對(duì)Core時(shí)鐘配置
CCM_ANALOG->PFD_528[PFD3_FRAC] = 24, PLL2 PFD3輸出 (528MHz * 18) / 24 = 396MHz
CCM->CBCMR[PRE_PERIPH_CLK_SEL] = 2, 時(shí)鐘來(lái)自PLL2 PFD3
CCM->CBCDR[PERIPH_CLK_SEL] = 0， 內(nèi)核時(shí)鐘來(lái)自CCM->CBCMR[PRE_PERIPH_CLK_SEL]
CCM->CBCDR[AHB_PODF] = 0， 內(nèi)核時(shí)鐘不分頻
// BootROM里對(duì)FlexSPI時(shí)鐘配置
CCM_ANALOG->PFD_480[PFD0_FRAC] = x, PLL3 PFD0輸出 (480MHz * 18) / x
CCM->CSCMR1[FLEXSPI_CLK_SEL] = 3, 時(shí)鐘來(lái)自PLL3 PFD0
CCM->CSCMR1[FLEXSPI_CLK_SRC] = 0， FlexSPI時(shí)鐘來(lái)自CCM->CSCMR1[FLEXSPI_CLK_SEL]
CCM->CSCMR1[FLEXSPI_PODF] = y， FlexSPI時(shí)鐘做(y+1)分頻
當(dāng)BootROM跳轉(zhuǎn)到了App之后，我們?cè)賮?lái)看看App里對(duì)時(shí)鐘是怎么配置的，就是BOARD_BootClockRUN()函數(shù)，可以看到這個(gè)函數(shù)里將內(nèi)核頻率從BootROM設(shè)置的396MHz切換到外部OSC 24MHz。無(wú)論此時(shí)用戶FDCB里對(duì)FlexSPI時(shí)鐘是多少配置，至少也會(huì)大于30MHz，那么此時(shí)24MHz內(nèi)核頻率一定會(huì)低于FlexSPI時(shí)鐘頻率，此時(shí)只要發(fā)生內(nèi)核對(duì)Flash加密區(qū)域的訪問(wèn)（時(shí)鐘配置代碼就在Flash里執(zhí)行），就觸發(fā)了OTFAD時(shí)鐘限制問(wèn)題，App就會(huì)跑飛。
三、解決方案
知道了原因，解決方案就簡(jiǎn)單了，在App時(shí)鐘配置里，不要按照尋常套路去先將內(nèi)核時(shí)鐘源切換到外部OSC再切到PLL，而是直接切到PLL上。比如i.MXRT1010內(nèi)部有個(gè)PLL6（也叫Audio PLL），固定500MHz，正好是App要的最終內(nèi)核頻率，我們?cè)贐OARD_BootClockRUN()里將Audio(Enet) PLL初始化設(shè)置代碼提到前面，刪掉原來(lái)的切換OSC設(shè)置代碼即可。
voidBOARD_BootClockRUN(void)
{
//此處略去...
/*SetOscillatorreadycountervalue.*/
CCM->CCR=(CCM->CCR&(~CCM_CCR_OSCNT_MASK))|CCM_CCR_OSCNT(127);
-/*SettingPeriphClk2MuxandPeriphMuxtoprovidestableclockbeforePLLsareinitialed*/
-CLOCK_SetMux(kCLOCK_PeriphClk2Mux,1);/*SetPERIPH_CLK2MUXtoOSC*/
-CLOCK_SetMux(kCLOCK_PeriphMux,1);/*SetPERIPH_CLKMUXtoPERIPH_CLK2*/
//此處略去...
/*SetIPG_PODF.*/
CLOCK_SetDiv(kCLOCK_IpgDiv,3);
+/*InitEnetPLL.*/
+CLOCK_InitEnetPll(&enetPllConfig_BOARD_BootClockRUN);
+/*Setpreperiphclocksource.*/
+CLOCK_SetMux(kCLOCK_PrePeriphMux,3);
//此處略去...
/*EnableAudioPLLoutput.*/
CCM_ANALOG->PLL_AUDIO|=CCM_ANALOG_PLL_AUDIO_ENABLE_MASK;
-/*InitEnetPLL.*/
-CLOCK_InitEnetPll(&enetPllConfig_BOARD_BootClockRUN);
-/*Setpreperiphclocksource.*/
-CLOCK_SetMux(kCLOCK_PrePeriphMux,3);
//此處略去...
/*SetSystemCoreClockvariable.*/
SystemCoreClock=BOARD_BOOTCLOCKRUN_CORE_CLOCK;
}
最后再提一下，這個(gè)OTFAD時(shí)鐘限制問(wèn)題在i.MXRT1170上同樣存在，解決思路與上面類似，痞子衡就不再贅述了。
至此，系統(tǒng)時(shí)鐘配置不當(dāng)會(huì)導(dǎo)致i.MXRT1xxx系列下OTFAD加密啟動(dòng)失敗問(wèn)題便介紹完畢了
1336S-BRF100-AN-FR4
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1794
MFR. PART NUMBER DESCRIPTION
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ALLEN BRADLEY 1794-ACNR15 CTRLNET ADAPTER
ALLEN BRADLEY 1794-AND DEVICENET ADAPTER
ALLEN BRADLEY 1794-ASB I/O ADAPTER
ALLEN BRADLEY 1794-ASB2 I/O ADAPTER
ALLEN BRADLEY 1794-IA16 16 INPUT MODULE
ALLEN BRADLEY 1794-IA8 8 INPUT MODULE
ALLEN BRADLEY 1794-IA8I 8 INPUT MODULE
ALLEN BRADLEY 1794-IB10X0B6 I/O MODULE
ALLEN BRADLEY 1794-IB16 16 INPUT MODULE
ALLEN BRADLEY 1794-IB8 8 INPUT MODULE
ALLEN BRADLEY 1794-IC16 16 INPUT MODULE
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ALLEN BRADLEY 1794-IE8 8 INPUT MODULE
ALLEN BRADLEY 1794-IF2X0F21 O/I MODULE
ALLEN BRADLEY 1794-IF41 4 INPUT MODULE
ALLEN BRADLEY 1794-IJ2 FREQ INPUT MODULE
ALLEN BRADLEY 1794-IM8 8 INPUT MODULE
ALLEN BRADLEY 1794-IR8 RTD INPUT MOD
ALLEN BRADLEY 1794-IRT8 RTD MODULE
ALLEN BRADLEY 1794-IT8 INPUT MODULE
ALLEN BRADLEY 1794-IV16 16 INPUT MODULE
ALLEN BRADLEY 1794-OA16 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OA8 8 OUTPUT MODULE
ALLEN BRADLEY 1794-OA8I 8 OUTPUT MODULE
ALLEN BRADLEY 1794-OB16 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OB16P 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OB8 8 OUTPUT MODULE
ALLEN BRADLEY 1794-OB8EP 8 OUTPUT MODULE
ALLEN BRADLEY 1794-OC16 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OE4 4 OUTPUT MODULE
ALLEN BRADLEY 1794-OF4I 4 OUTPUT MODULE
ALLEN BRADLEY 1794-OM8 8 OUTPUT MODULE
ALLEN BRADLEY 1794-OV16 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OV16P 16 OUTPUT MODULE
ALLEN BRADLEY 1794-OW8 8 OUTPUT MODULE
ALLEN BRADLEY 1794-PS1 POWER SUPPLY MODULE
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ALLEN BRADLEY 1794-TB3G TERM BASE UNIT
ALLEN BRADLEY 1794-TB3GS TERM BASE UNIT
ALLEN BRADLEY 1794-TB3S TERM BASE UNIT
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ALLEN BRADLEY 1794-TB3TS TERM BASE UNIT
ALLEN BRADLEY 1794-TBN TERM BASE UNIT
ALLEN BRADLEY 1794-TBNF TERM BASE UNIT
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