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Boot Process
tommie edited this page Nov 15, 2014
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- Reset vector is 40000000h (unconfirmed).
- Boots into Xtensa SROM (unconfirmed).
- Transfers control to Espressif code in IROM0 (unconfirmed).
- Starts executing ESP SDK-code shadowed SPI ROM (unconfirmed).
The Espressif code can boot in different modes, selected on power-up based on GPIO pin levels.
| GPIO0 | GPIO2 | MTDO | Mode | Description |
|---|---|---|---|---|
| L | H | L | UART | Download code from UART |
| H | H | L | SPI | Boot from SPI Flash |
| x | x | H | SDIO | Boot from SD-card |
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