SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
The primary boot mode is the first mode attempted after reset. Table 4-8 lists all possible primary boot modes. Boot modes with Boot Mode B = 1 are available during normal boot only.
| Primary Boot Mode B Pin | Primary Boot Mode A Pins | Boot Mode Selected | ||
|---|---|---|---|---|
| 0 | MCU 5 | MCU 4 | MCU 3 | |
| 0 | 0 | 0 | 0 | Hyperflash |
| 0 | 0 | 0 | 1 | OSPI |
| 0 | 0 | 1 | 0 | QSPI |
| 0 | 0 | 1 | 1 |
SPI(SR1.0) xSPI (SR2.0) |
| 0 | 1 | 0 | 0 | Ethernet RGMII |
| 0 | 1 | 0 | 1 | Reserved(1) |
| 0 | 1 | 1 | 0 | I2C |
| 0 | 1 | 1 | 1 | UART |
| 1 | 0 | 0 | 0 | MMC/SD card |
| 1 | 0 | 0 | 1 | eMMC |
| 1 | 0 | 1 | 0 | USB |
| 1 | 1 | 0 | 1 | Reserved(2) |
| 1 | 1 | 1 | 0 |
xSPI(SR1.0) SPI(SR2.0) |
| 1 | 1 | 1 | 1 | No-boot/Dev boot |