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Add RTC memory overlap comment in preferences.cpp

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J. Nick Koston
2026-04-05 13:33:27 -10:00
parent 82d178486b
commit 42f9b4225f
1 changed files with 3 additions and 0 deletions
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esphome/components/esp8266/preferences.cpp
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@@ -22,6 +22,9 @@ static constexpr uint32_t ESP_RTC_USER_MEM_SIZE_BYTES = ESP_RTC_USER_MEM_SIZE_WO
// RTC memory layout for preferences:
// - Eboot region: RTC words 0-31 (reserved, mapped from preference offset 96-127)
// - Normal region: RTC words 32-127 (mapped from preference offset 0-95)
// Note: The crash handler (crash_handler.cpp) uses RTC blocks 174-191 (words 110-127)
// for stack backtrace data written only during crashes. Preferences fill from the start
// so this only conflicts if 110+ words of RTC preferences are allocated.
static constexpr uint32_t RTC_EBOOT_REGION_WORDS = 32; // Words 0-31 reserved for eboot
static constexpr uint32_t RTC_NORMAL_REGION_WORDS = 96; // Words 32-127 for normal prefs
static constexpr uint32_t PREF_TOTAL_WORDS = RTC_EBOOT_REGION_WORDS + RTC_NORMAL_REGION_WORDS; // 128