SPRUJC6A December 2024 – July 2025 AM2752-Q1 , AM2754-Q1
MMCSD/eMMC Boot Parameter Table shows the boot parameter table for eMMC, MMC or SD card boot. Must be preceded with the common boot parameters described in Boot Parameter Table Common Header.
| Byte Offset | Size (bytes) | Name | Default Value | Description |
|---|---|---|---|---|
| 256 | 1 | Port | From Pins | Port for emmc and SD/MMC |
| 257 | 1 | eMMC | From Pins | 0 = SD/MMC, else eMMC |
| 258 | 1 | bootAck | 1 for eMMC 0 for SD/MMC |
If 1 and in eMMC mode the controller expects a boot ack from the eMMC |
| 259 | 1 | Media | 1 for eMMC 0 for SD/MMC |
0 = auto detect card type 1 = MMC 2 = SD |
| 260 | 1 | busWidth | 8 for eMMC From Pins for SD/MMC |
Number of data pins (1, 4, or 8). If 0, max supported pins of the port are used. |
| 261 | 1 | bootAlt | 1 for eMMC 0 for SD/MMC |
If 1 and in eMMC mode, the controller uses the alt boot method (CMD1 with arg 0xFFFF_FFFA) to initiate data transfer |
| 262 | 1 | sigVolt | 0x18 for port0 0x33 for port1 |
Sets the signal voltage for the controller. 0x18 = 1.8V 0x33 = 3.3V |
| 263 | 1 | Reserved | 0 | Reserved |
| 264 | 4 | Max Bus Freq | 0 | Max bus frequency in kHz. If 0, the value is determined by reading the CSD register from the card (still maxes out at 25 MHz) |
| 268 | 4 | refClkkHz | 0 | Module reference clock frequency, in kHz. If 0, the ROM code computes the value. |
| 272 | 4 | respTimeout | 40000 | The timeout period on initial card read, in milli-seconds, Q3 number format |
| 276 | 128 | Filename | "\tiboot3.bin" | For SD/MMC, boot filename in 16-bit Unicode characters (max 64) |
| 404 | 4 | Mode | 0x1144D091 | 0x1144D091 = file system boot 0x1144C180 = raw image boot |
| 408 | 4 | CardIsInit | 0 | 0 = card not yet initialized 1 = card has been initialized |
| 412 | 4 | Rsvd | 0 | Reserved |
| 416 | 4 | RawIndex | 0 | Current active read offset (0 or 1) |
| 420 | 4 | Rsvd | 0 | Reserved |
| 424 | 4 | Raw Offset 0 | 0x000000 | Raw read offset |
| 428 | 4 | Raw Offset 1 | 0x400000 | Backup raw read offset |
| 432 | 4 | Rsvd | 0 | Reserved |
| 436 | 4 | Rsvd | 0 | Reserved |