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Following this initialization phase, i-boot loads x-boot from external storage devices into SRAM and performs a checksum verification. If the verification passes, i-boot proceeds to execute x-boot.
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Key features
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Output log at UART0 with a baud rate of 115,200 bps.
UART0 pins can be turned off through an OTP bit.
Read bootstrap pins IV_MX[6..3] to decide boot-device.
Support for five boot devices: SPI-NOR flash, SPI-NAND flash, 8-bit NAND flash, eMMC, SD card, and USB flash drive (on either USB2.0 or USB3.0 port).
Implementation of secure-boot with the ability to verify the digital signature of the x-boot image and decrypt it.
Secure-boot activation controlled by an OTP bit.
Support for warm-boot, enabling wake-up from deep-sleep mode.
Support for the peripheral-reset signal (output from G_MX2).
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