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Reserve crash handler RTC region from preferences

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Reduce preferences normal region from 96 to 78 words (words 32-109)
to formally reserve words 110-127 for the crash handler backtrace.
Preferences that don't fit in RTC fall back to flash storage, so
this has no functional impact for typical configurations.
This commit is contained in:
J. Nick Koston
2026-04-05 13:35:01 -10:00
parent 42f9b4225f
commit 2657bdc97a
1 changed files with 6 additions and 8 deletions
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esphome/components/esp8266/preferences.cpp
+6 -8
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@@ -19,15 +19,13 @@ static constexpr uint32_t ESP_RTC_USER_MEM_START = 0x60001200;
static constexpr uint32_t ESP_RTC_USER_MEM_SIZE_WORDS = 128;
static constexpr uint32_t ESP_RTC_USER_MEM_SIZE_BYTES = ESP_RTC_USER_MEM_SIZE_WORDS * 4;
// 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.
// RTC memory layout:
// - Eboot region: RTC words 0-31 (reserved, mapped from preference offset 78-109)
// - Normal region: RTC words 32-109 (mapped from preference offset 0-77)
// - Crash handler: RTC words 110-127 (reserved for crash_handler.cpp backtrace data)
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
static constexpr uint32_t RTC_NORMAL_REGION_WORDS = 78; // Words 32-109 for normal prefs
static constexpr uint32_t PREF_TOTAL_WORDS = RTC_EBOOT_REGION_WORDS + RTC_NORMAL_REGION_WORDS; // 110
// Maximum preference size in words (limited by uint8_t length_words field)
static constexpr uint32_t MAX_PREFERENCE_WORDS = 255;