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bootloader_support: Fix enable rtc_wdt for resolve issue with varying supply

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Eliminates the issue with the lock up in the bootloader due to a power drawdown during its operation.

Closes https://github.com/espressif/esp-idf/issues/1814
This commit is contained in:
Konstantin Kondrashov
2018-07-26 17:07:36 +08:00
committed by bot
parent 5f1844a0c8
commit 9c715d7946
8 changed files with 110 additions and 3 deletions
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32
components/bootloader/Kconfig.projbuild
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@@ -127,6 +127,38 @@ config BOOTLOADER_HOLD_TIME_GPIO
The GPIO must be held low continuously for this period of time after reset
before a factory reset or test partition boot (as applicable) is performed.
config BOOTLOADER_WDT_ENABLE
bool "Use RTC watchdog in start code"
default y
help
Tracks the execution time of startup code.
If the execution time is exceeded, the RTC_WDT will restart system.
It is also useful to prevent a lock up in start code caused by an unstable power source.
NOTE: Tracks the execution time starts from the bootloader code - re-set timeout, while selecting the source for slow_clk - and ends calling app_main.
Re-set timeout is needed due to WDT uses a SLOW_CLK clock source. After changing a frequency slow_clk a time of WDT needs to re-set for new frequency.
slow_clk depends on ESP32_RTC_CLOCK_SOURCE (INTERNAL_RC or EXTERNAL_CRYSTAL).
config BOOTLOADER_WDT_DISABLE_IN_USER_CODE
bool "Allows RTC watchdog disable in user code"
depends on BOOTLOADER_WDT_ENABLE
default n
help
If it is set, the client must itself reset or disable rtc_wdt in their code (app_main()).
Otherwise rtc_wdt will be disabled before calling app_main function.
Use function rtc_wdt_feed() for resetting counter of rtc_wdt.
Use function rtc_wdt_disable() for disabling rtc_wdt.
config BOOTLOADER_WDT_TIME_MS
int "Timeout for RTC watchdog (ms)"
depends on BOOTLOADER_WDT_ENABLE
default 9000
range 0 120000
help
Verify that this parameter is correct and more then the execution time.
Pay attention to options such as reset to factory, trigger test partition and encryption on boot
- these options can increase the execution time.
Note: RTC_WDT will reset while encryption operations will be performed.
endmenu # Bootloader