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arch/risc-v/espressif: keep RTC backup data in DRAM without RTC memory

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SoCs such as the ESP32-C2 have no RTC retention memory, so RTC_DATA_ATTR
cannot be used for the persistent RTC time.  Place the backup data in DRAM
on those chips, where the saved time does not survive deep sleep.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Marcio Ribeiro <marcio.ribeiro@espressif.com>
This commit is contained in:
Marcio Ribeiro 2026-09-16 14:56:15 -03:00 • committed by Michal Lenc
parent a73bea0653
commit ccf67497c7
1 changed files with 9 additions and 1 deletions
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10
arch/risc-v/src/common/espressif/esp_rtc.c
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@ -164,9 +164,15 @@ static bool g_hr_timer_enabled = false;
#endif /* CONFIG_RTC_DRIVER */
/* Saved data for persistent RTC time */
/* Saved data for persistent RTC time. Chips without RTC retention memory
* keep it in DRAM, so the saved time does not survive deep sleep.
*/
#ifdef SOC_RTC_MEM_SUPPORTED
static RTC_DATA_ATTR struct esp_rtc_backup_s g_rtc_saved_data;
#else
static struct esp_rtc_backup_s g_rtc_saved_data;
#endif
static struct esp_rtc_backup_s *g_rtc_save;
/****************************************************************************
@ -326,6 +332,7 @@ static int esp_rtc_rdtime(struct rtc_lowerhalf_s *lower,
if (gmtime_r(&timer, (struct tm *)rtctime) == 0)
{
int errcode = get_errno();
DEBUGASSERT(errcode > 0);
rtcerr("gmtime_r failed: %d\n", errcode);
@ -949,6 +956,7 @@ int esp_rtc_driverinit(void)
struct rtc_lowerhalf_s *lower = (struct rtc_lowerhalf_s *)&g_rtc_lowerhalf;
int ret = rtc_initialize(0, lower);
if (ret < 0)
{
return ret;