SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
Table 4-64 shows the boot parameter table for UART boot. Must be preceded with the common boot parameters described in Table 4-51.
| Byte Offset | Size (bytes) | Name | Default Value | Description |
|---|---|---|---|---|
| 256 | 1 | Magic | 0x49 | Required Magic value |
| 257 | 1 | Protocol | 63 (0x3F) | Specifies the transfer protocol = XMODEM |
| 258 | 2 | Reserved | 0 | Reserved |
| 260 | 1 | Max error Count | 10 | Error count resulting in boot abort |
| 261 | 1 | Ack timeout | 3 | Timeout in seconds on ack |
| 262 | 1 | Char timeout | 20 | Inter-character timeout in milliseconds |
| 263 | 1 | Reserved | 0 | Reserved |
| 264 | 4 | Port | From Pins | Physical port number |
| 268 | 4 | Mod Ref Clk | 48000 | Module reference clock, in kHz |
| 272 | 4 | Data Rate | 115200 | Baud rate (bps) |
| 276 | 1 | Parity | 0 | 0=none, 1=odd, 2=even |
| 277 | 1 | Data bits | 8 | Only 8 data bit width is supported |
| 278 | 1 | Stop bits | 2 | Stop bits in Q7.1 format (2 = 1 stop bit) |
| 279 | 1 | Flow Control | 0 | 0=none, 1= RTS/CTS |
| 280 | 1 | Over sample | 16 | Only 16× and 13× oversample are supported |
| 281 | 1 | Magic 2 | 0xB7 | Required magic value |