To improve the boot time of SD card, set the CPU clock divider to 2 instead of 4. The setting
assumes a 33 MHz PS_CLK. If a faster clock is used, then a larger
divider must be considered.
| Register | Security | Value | Description |
|---|---|---|---|
| slcr.ARM_CLK_CTRL | Both |
0x1F000200
|
CPU divisor = 2 (433 MHz) |