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refactor(esp_system): deduplicate ROM fast wake RTC digest reservation

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The digest length and the condition that reserves it at the end of RTC RAM were
duplicated in seven places. Hold the reservation in a hidden Kconfig value that
is zero when the feature does not apply, so every consumer subtracts it
unconditionally, and derive ESP_SECURE_BOOT_DIGEST_LEN from it.
This commit is contained in:
harshal.patil
2026-07-30 12:20:22 +05:30
parent f2b2bac778
commit e1d60fb89f
15 changed files with 57 additions and 99 deletions
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components/esp_system/ld/ld.rtc.sections
+9
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@@ -147,11 +147,20 @@
*/
*(.rtc_timer_data_in_rtc_mem .rtc_timer_data_in_rtc_mem.*)
KEEP(*(.bootloader_data_rtc_mem .bootloader_data_rtc_mem.*))
_bootloader_data_rtc_mem_end = ABSOLUTE(.);
/* ROM keeps the verified image digest in the last bytes of RTC RAM */
. = . + CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE;
#endif // CONFIG_IDF_TARGET_ESP32P4
_rtc_reserved_end = ABSOLUTE(.);
} > rtc_reserved_seg
#if CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE > 0
ASSERT((_bootloader_data_rtc_mem_end == ORIGIN(rtc_reserved_seg) + LENGTH(rtc_reserved_seg)
- CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE),
"The ROM secure boot fast wake up digest must occupy the last bytes of RTC RAM, and the bootloader retain mem must end where it begins. bootloader_common_get_rtc_retain_mem() computes that address.")
#endif
_rtc_ulp_memory_start = _rtc_reserved_start + LENGTH(rtc_reserved_seg);
_rtc_reserved_length = _rtc_reserved_end - _rtc_reserved_start;
ASSERT((_rtc_reserved_length <= LENGTH(rtc_reserved_seg)),