Ivan Grokhotkov e324707cc8 esp_restart: fix possible race while stalling other CPU, enable WDT early ... Previously esp_restart would stall the other CPU before enabling RTC_WDT. If the other CPU was executing an s32c1i instruction, the lock signal from CPU to the arbiter would still be held after CPU was stalled. If the CPU running esp_restart would then try to access the same locked memory pool, it would be stuck, because lock signal would never be released. With this change, esp_restart resets the other CPU before stalling it. Ideally, we would want to reset the CPU and keep it in reset, but the hardware doesn't have such feature for PRO_CPU (it is possible to hold APP_CPU in reset using DPORT register). Given that ROM code will not use s32c1i in the first few hundred cycles, doing reset and then stall seems to be safe. In addition to than, RTC_WDT initialization is moved to the beginning of the function, to prevent possible lock-up if CPU stalling still has any issue.		2017-11-09 16:05:35 +08:00
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soc	esp_restart: fix possible race while stalling other CPU, enable WDT early	2017-11-09 16:05:35 +08:00
esp_brownout.h	soc: add source code of rtc_clk, rtc_pm	2017-04-11 15:45:54 +08:00