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Boot Process
jcmvbkbc edited this page Nov 17, 2014
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13 revisions
- Reset vector is 0x40000080.
- Boots into Xtensa XTOS code in IROM0.
- Transfers control to Espressif code in IROM0.
- 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.
| MTDO | GPIO0 | GPIO2 | Mode | Description |
|---|---|---|---|---|
| L | L | H | UART | Download code from UART |
| L | H | H | Flash | Boot from SPI Flash |
| H | x | x | SDIO | Boot from SD-card |
- Chinese seller with boot modes
- Translated boot modes
- ESP8266_Module Application Design Guide Chinese.pdf
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- AT Command set
- 0.9.1