Espressif Systems ESP Faq page 135

Chapter 4. Software framework
4.9.6 Which part of ESP8266 partition-tables should be paid special attention to?
Compared to those of ESP32, partition-tables of ESP8266 have some special requirements on OTA
partitions due to cache characteristics of ESP8266. For details, please refer to
Partition Tables。
4.9.7 Is it possible to compile the binaries in application layer and bottom layer sepa-
rately?
No, they cannot be compiled separately.
4.9.8 How can I to reduce the IRAM occupied by the ESP32 system?
• Please disable menuconfig > Component config > LWIP > Enable LWIP IRAM optimiza-
tion by typing N.
• Please change the configurations in menuconfig > Compiler option > Optimization Level >
Optimize for size (-Os).
• Please disable WiFi IRAM speed optimization (N) and WiFi RX IRAM speed optimiza-
tion (N) in menuconfig > Component config > wifi.
• For more details, please refer to
4.9.9 How can I optimize the size of binary files compiled by ESP32?
• Please optimize GCC compilation by idf.py menuconfig > Compiler options > Optimiza-
tion level (Optimize for size(-Os))。
• You can also optimize your code to improve the code reusability, and you can also adjust the log level to only
print necessary logs.
• For more details, please refer to
4.9.10 How can I turn off log output in ESP32？
• You can turn off the bootloader log by setting menuconfig > bootloader config > bootloader
log verbosity to No output.
• You can turn off the program log by setting menuconfig > Component config > log output >
Default log verbosity to No output.
• For ESP-IDF release/v4.3 and earlier versions, you can turn off UART0 output log by menuconfig > Com-
ponent Config > Common ESP-related > Channel for console output > None.
• For ESP-IDF release/v4.4 and later versions, you can turn off UART0 output log by Component config
> ESP System Settings > Channel for console output > None.
4.9.11 How to modify the GPIO used for log output on ESP32?
• Go to menuconfig > Component Config > ESP System Settings > Channel for console
output > Custom UART and select the UART port.
• Go back to the previous level of menu, find the options UART TX on GPIO# and UART RX on GPIO#, and use
them to modify the log output GPIO.
Espressif Systems
Minimizing RAM Usage。
Minimizing Binary Size。
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