The backup boot mode is selected via pins within the main BOOTMODE map. Table 5-5 lists all possible backup boot modes.
Table 5-5 Backup Mode SelectionBackup Boot Config | Backup Boot Mode Selection | Backup Boot Mode Selected |
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B13 | B12 | B11 | B10 |
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Reserved | 0 | 0 | 0 | None |
Mode | 0 | 0 | 1 | USB |
Reserved | 0 | 1 | 0 | Reserved |
Reserved | 0 | 1 | 1 | UART |
IF | 1 | 0 | 0 | Ethernet |
Port | 1 | 0 | 1 | MMCSD Boot (SD Card Boot or eMMC Boot ) |
Reserved | 1 | 1 | 0 | SPI |
Reserved | 1 | 1 | 1 | I2C |