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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
2026-07-31 11:28:31 +08:00
committed by wuzhenghui
parent d4d00e6ab7
commit e37d6e40b0
11 changed files with 86 additions and 47 deletions
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components/bootloader_support/src/bootloader_common_loader.c
+10 -10
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@@ -14,9 +14,6 @@
#include "esp_rom_crc.h"
#include "esp_rom_gpio.h"
#include "esp_flash_partitions.h"
#if CONFIG_SECURE_BOOT
#include "esp_secure_boot.h"
#endif
#include "bootloader_flash.h"
#include "bootloader_common.h"
#include "soc/gpio_periph.h"
@@ -33,6 +30,14 @@
#define ESP_PARTITION_HASH_LEN 32 /* SHA-256 digest length */
#define IS_FIELD_SET(rev_full) (((rev_full) != 65535) && ((rev_full) != 0))
#if ESP_ROM_HAS_LP_ROM && CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE > 0
#error "Retain mem is placed at the start of RTC RAM on this target, while the ROM keeps the secure boot fast wake up digest at the end of it. The layout needs to be re-evaluated."
#endif
#if CONFIG_SECURE_BOOT && ESP_ROM_SUPPORT_SECURE_BOOT_FAST_WAKEUP && CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE == 0
#error "esp_rom_caps.h advertises ROM secure boot fast wake up support that Kconfig.soc_caps.in does not, so the digest area is left unreserved."
#endif
static const char* TAG = "boot_comm";
uint32_t bootloader_common_ota_select_crc(const esp_ota_select_entry_t *s)
@@ -243,13 +248,8 @@ rtc_retain_mem_t* bootloader_common_get_rtc_retain_mem(void)
{
#ifdef BOOTLOADER_BUILD
#define RTC_RETAIN_MEM_ADDR (SOC_RTC_DRAM_HIGH - sizeof(rtc_retain_mem_t))
#if CONFIG_SECURE_BOOT && ESP_ROM_SUPPORT_SECURE_BOOT_FAST_WAKEUP
/* ROM stores the verified image digest in the last ESP_SECURE_BOOT_DIGEST_LEN
* bytes of LP/RTC RAM on deep-sleep wake. Keep retain mem below that region. */
static rtc_retain_mem_t *const s_bootloader_retain_mem = (rtc_retain_mem_t *)((uintptr_t)RTC_RETAIN_MEM_ADDR - ESP_SECURE_BOOT_DIGEST_LEN);
#else
static rtc_retain_mem_t *const s_bootloader_retain_mem = (rtc_retain_mem_t *)RTC_RETAIN_MEM_ADDR;
#endif
static rtc_retain_mem_t *const s_bootloader_retain_mem =
(rtc_retain_mem_t *)((uintptr_t)RTC_RETAIN_MEM_ADDR - CONFIG_SECURE_BOOT_ROM_FAST_WAKE_RESERVE_SIZE);
return s_bootloader_retain_mem;
#else
static __attribute__((section(".bootloader_data_rtc_mem"))) rtc_retain_mem_t s_bootloader_retain_mem;