757f58c3ba
Prior to this commit, we don't consider the offset of the irom vaddr start. If the offset + size is bigger than the MMU page size, for example: MMU page size: 0x10000 irom vaddr: 0x4200_0800, so offset = 0x800 irom size: 0xF900 offset + size = 0x10100 Under this condition, the 0x4200_0000 ~ 0x4202_0000, two MMU pages are used. With this commit, when reserving the irom and drom, we take the offset into consideration as well. Closes https://github.com/espressif/esp-idf/issues/2561
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.