! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Version
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |X.Y.Z2021/02/24| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Month Year| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |TBDFirst Release
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |[TBD_link X.Y.Z]
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Month Year
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |TBD
|-
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |...
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |...
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |...
|-
|}
<section end="History" />
__FORCETOC__
<section begin="Body" />
* determines whether the boot is secure or non-secure
* performs some initialization of the system and clean-ups
* reads the OTP settings
* reads the mode pins to determine the primary boot device
* once it is satisfied, it executes the boot code
=== Boot options ===
The default primary boot device is internally set by pull-up or pull-down resistors according to the Boot Mode fileld of the ordering code.
The following table shows all the available options:
[[File{| class="wikitable" style="width:STM32MP1 50%;"|-|'''BOOT_MODE2'''|'''BOOT_MODE1'''|'''BOOT_MODE0'''|'''PRIMARY BOOT DEVICE'''|-|0|0|0|UART and USB|-|0|0|1|Serial NOR on QUADSPI|-|0|1|0|eMMC on SDMMC2|-|0|1|1|SLC NAND on FMC|-|1|0|0|no boot modes(for debug access)|-|1|0|1|SD card on SDMMC1|-|1|1|0|UART and USB|-|1|1|1|Serial NAND on QUADSPI|} Use 1k resistors either to VDD or DGND to drive externally the BOOT_MODEx signals. === On board OTP === The reading of BOOT_MODEx pins can be disabled by OTP configuration, in this case the OTP settings are used by the ROM code to determine the boot device.png | 800px]]
Use 1k resistors either to VDD or DGND to drive Boot sources can be individually disabled by the BOOT_MODEx signalsOTP settings.
----
[[Category:ETRA]]