Chapter 2. API Reference
• CONFIG_BOOTLOADER_SKIP_VALIDATE_ON_POWER_ON
• CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
• CONFIG_BOOTLOADER_WDT_ENABLE
• CONFIG_BOOTLOADER_VDDSDIO_BOOST
CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION
Bootloader optimization Level
Found in: Bootloader config
This option sets compiler optimization level (gcc -O argument) for the bootloader.
• The default “Size”setting will add the -0s flag to CFLAGS.
• The “Debug”setting will add the -Og flag to CFLAGS.
• The “Performance”setting will add the -O2 flag to CFLAGS.
• The “None”setting will add the -O0 flag to CFLAGS.
Note that custom optimization levels may be unsupported.
Available options:
• Size (-Os) (BOOTLOADER_COMPILER_OPTIMIZATION_SIZE)
• Debug (-Og) (BOOTLOADER_COMPILER_OPTIMIZATION_DEBUG)
• Optimize for performance (-O2) (BOOTLOADER_COMPILER_OPTIMIZATION_PERF)
• Debug without optimization (-O0) (BOOTLOADER_COMPILER_OPTIMIZATION_NONE)
CONFIG_BOOTLOADER_LOG_LEVEL
Bootloader log verbosity
Found in: Bootloader config
Specify how much output to see in bootloader logs.
Available options:
• No output (BOOTLOADER_LOG_LEVEL_NONE)
• Error (BOOTLOADER_LOG_LEVEL_ERROR)
• Warning (BOOTLOADER_LOG_LEVEL_WARN)
• Info (BOOTLOADER_LOG_LEVEL_INFO)
• Debug (BOOTLOADER_LOG_LEVEL_DEBUG)
• Verbose (BOOTLOADER_LOG_LEVEL_VERBOSE)
CONFIG_BOOTLOADER_VDDSDIO_BOOST
VDDSDIO LDO voltage
Found in: Bootloader config
If this option is enabled, and VDDSDIO LDO is set to 1.8V (using eFuse or MTDI bootstrapping pin),
bootloader will change LDO settings to output 1.9V instead. This helps prevent flash chip from browning
out during flash programming operations.
This option has no effect if VDDSDIO is set to 3.3V, or if the internal VDDSDIO regulator is disabled
via eFuse.
Available options:
• 1.8V (BOOTLOADER_VDDSDIO_BOOST_1_8V)
• 1.9V (BOOTLOADER_VDDSDIO_BOOST_1_9V)
Espressif Systems 1063
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