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docs(general_notes): Add general notes to main page of document

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Dong Heng
2019-01-30 15:49:20 +08:00
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*************
General Notes
*************
Adding this content here is to improve the user's development efficiency and avoid stepping into known problems.
1. Bootloader
^^^^^^^^^^^^^
V3.1 updated the bootloader to initialize SPI flash I/O mode and clock. So if you are using the V3.0 bootloader,
and now upgrade to the new SDK, please disable the following configuration in the menuconfig:
- "Bootloader config ---> [ ] Bootloader init SPI flash"
2. Sniffer or Smartconfig
^^^^^^^^^^^^^^^^^^^^^^^^^
We moved some functions from IRAM to flash, including `malloc` and `free` fucntions, to save more memory.
In this case, please do not read/write/erase flash during sniffer/promiscuous mode.
You need to disable the sniffer/promiscuous mode at first, then read/write/erase flash.
3. ESP8285 or ESP8266 + 1MB flash
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ESP8285 or ESP8266 + 1MB flash can use "Copy OTA Mode" for OTA, more details are in the `examples/system/ota <https://github.com/espressif/ESP8266_RTOS_SDK/tree/master/examples/system/ota/>`_.