67a1fe6373
For cases where the bootloader is not enabled with the security features ends up receiving an incorrect application with flash encryption enabled should not really program any security efuses. In the startup sequence, we first used to program the ROM DL mode configuration but now we check for the flash encryption related checks first. If the flash encryption related checks finds that flash encryption is not enabled on the device then it aborts the boot process. This is the case with `CONFIG_SECURE_FLASH_CHECK_ENC_EN_IN_APP` enabled. This would at-least ensure that accidental program of security enabled application does not really program any ROM DL mode efuses and there is chance to recover the device.
System Notes
Timekeeping
The following are the timekeeping mechanisms available and their differences:
- System time (
esp_system_get_time)
Time with the origin at g_startup_time. The implementation is not handled by esp_system,
but it does provide a default implementation using RTC timer. Currently, esp_timer
provides system time, since the hardware timers are under the control of that
component. However, no matter the underlying timer, the system time provider
should maintain the definition of having the origin point at g_startup_time.
esp_timertime (esp_timer_get_time)
This is the time read from an underlying hardware timer, controlled through config. Origin is at the point where the underlying timer starts counting.
newlibtime (gettimeofday)
Timekeeping function in standard library. Can be set (settimeofday) or moved forward/backward (adjtime);
with the possibility of the changes being made persistent through config.
Currently implemented in terms of system time, as the point of origin is fixed.
If persistence is enabled, RTC time is also used in conjuction with system time.
- RTC time (
esp_rtc_get_time_us)
Time read from RTC timer.
Brownout
on some boards, we name BOD1 as ana_bod, to unify the usage, using BOD1 in following passage.
BOD1 will be a little faster then BOD0, but BOD0 can be widely used(can reset rf, flash, or using interrupt, etc.) So, in IDF code, we use BOD1 in bootloader and BOD0 in the app.