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Merge branch 'bugfix/esp_random_bringup_bypass' into 'master'

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fix(esp_hw_support): bypass esp_random during chip bringup

See merge request espressif/esp-idf!45170
This commit is contained in:
Aditya Patwardhan
2026-01-21 08:43:00 +05:30
parent af0d40e0d6 e4a0a6439e
commit 469ead652b
1 changed files with 15 additions and 1 deletions
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components/esp_hw_support/hw_random.c
+15 -1
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@@ -1,5 +1,5 @@
/* /*
* SPDX-FileCopyrightText: 2016-2025 Espressif Systems (Shanghai) CO LTD * SPDX-FileCopyrightText: 2016-2026 Espressif Systems (Shanghai) CO LTD
* *
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
*/ */
@@ -14,6 +14,7 @@
#include "soc/wdev_reg.h" #include "soc/wdev_reg.h"
#include "esp_private/esp_clk.h" #include "esp_private/esp_clk.h"
#include "soc/soc_caps.h" #include "soc/soc_caps.h"
#include "esp_log.h"
#if !ESP_TEE_BUILD #if !ESP_TEE_BUILD
#include "esp_private/startup_internal.h" #include "esp_private/startup_internal.h"
@@ -47,8 +48,20 @@
#define APB_CYCLE_WAIT_NUM (16) #define APB_CYCLE_WAIT_NUM (16)
#endif #endif
#if CONFIG_ESP_BRINGUP_BYPASS_RANDOM_SETTING
static bool s_random_warning_printed = false;
#endif
uint32_t IRAM_ATTR esp_random(void) uint32_t IRAM_ATTR esp_random(void)
{ {
#if CONFIG_ESP_BRINGUP_BYPASS_RANDOM_SETTING
if (!s_random_warning_printed) {
ESP_LOGW("esp_random", "esp_random is not yet supported and will not give proper random values");
s_random_warning_printed = true;
}
// Return a fixed pattern for bringup purposes
return 0x5A5A5A5A;
#else
/* The PRNG which implements WDEV_RANDOM register gets 2 bits /* The PRNG which implements WDEV_RANDOM register gets 2 bits
* of extra entropy from a hardware randomness source every APB clock cycle * of extra entropy from a hardware randomness source every APB clock cycle
* (provided WiFi or BT are enabled). To make sure entropy is not drained * (provided WiFi or BT are enabled). To make sure entropy is not drained
@@ -84,6 +97,7 @@ uint32_t IRAM_ATTR esp_random(void)
} }
last_ccount = ccount; last_ccount = ccount;
return result ^ REG_READ(WDEV_RND_REG); return result ^ REG_READ(WDEV_RND_REG);
#endif // CONFIG_ESP_BRINGUP_BYPASS_RANDOM_SETTING
} }
void esp_fill_random(void *buf, size_t len) void esp_fill_random(void *buf, size_t len)