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It's essential to note that i-boot does not initialize DDR DRAM, rendering it temporarily unavailable. Hence, x-boot must be loaded into SRAM for execution.
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Device drivers
Drivers | Features |
8-bit NAND | First block of 8-bit NAND flash should contain Sunplus Boot Profile Header. Support reading 1K60 ECC sectors. x-boot image should be stored in 1K60 ECC sectors. Set MS control of pins of 8-bit NAND flash. Read cycle-time is 240 nS.
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eMMC | x-boot image should be stored at Boot Area Partition 1. Set MS control of pins of eMMC device. Bus clock is 25 MHz.
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SPI-NAND | First block of SPI-NAND flash should contain Sunplus Boot Profile Header. Support reading 1K60 ECC sectors. x-boot image should be stored in 1K60 ECC sectors. Support X1 and X2 position of SPI-NAND. Set MS control-bit of pins of SPI-NAND flash. Bus clock is 11.2 MHz.
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SD card | x-boot image should be stored at offset 0 of the file ISPBOOOT.BIN. File ISPBOOOT.BIN should be stored root directory of first partition of the SD card. First partition of the SD card should be FAT32 or FAT16 format. Bus clock is 5 MHz.
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USB2.0 Host | x-boot image should be stored at offset 0 of the file ISPBOOOT.BIN. File ISPBOOOT.BIN should be stored root directory of first partition of the USB flash drive. First partition of the USB flash drive should be FAT32 or FAT16 format. Support high-speed read operation only
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USB3.0 Host | x-boot image should be stored at offset 0 of the file ISPBOOOT.BIN. File ISPBOOOT.BIN should be stored root directory of first partition of the USB flash drive. First partition of the USB flash drive should be FAT32 or FAT16 format. Support high-speed read operation only
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