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| S4-1 | S4-2 | Description |
|---|---|---|
| ON | ON | Default, boot from SD/eMMC or SPI Flash if no SD is detected |
| OFF | ON | Boot mode PJTAG0 |
| ON | OFF | Boot from eMMC |
| OFF | OFF | Boot mode main JTAG |
| Note |
|---|
If MicroSD is detected, the system boots from this SD-Card independents from S4 setting. |
UART
XMOD_TXD is sourced by MIO43 and MIO42 by XMOD_RXD.
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