soc: add capability macros for security features

- Security features covers "secure boot", "flash encryption" etc.
- ECO revision specific modifications still need to be handled
through kconfig itself, as soc_caps.h is processed before ECO revision
selection
- This will simplify addition of security features for newer chips by
using these SOC capability macros
This commit is contained in:
Mahavir Jain 2022-03-31 17:43:50 +05:30 committed by BOT
parent 813fa1e4ae
commit 74005ed2f5
12 changed files with 241 additions and 106 deletions

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@ -75,10 +75,6 @@ config SOC_CCOMP_TIMER_SUPPORTED
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
bool
default y
config SOC_RTC_FAST_MEM_SUPPORTED
bool
default y
@ -115,6 +111,14 @@ config SOC_SHA_SUPPORTED
bool
default y
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_ADC_RTC_CTRL_SUPPORTED
bool
default y
@ -571,6 +575,14 @@ config SOC_AES_SUPPORT_AES_256
bool
default y
config SOC_SECURE_BOOT_V1
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 32

View File

@ -78,7 +78,6 @@
#define SOC_CPU_CORES_NUM 2
#define SOC_ULP_SUPPORTED 1
#define SOC_CCOMP_TIMER_SUPPORTED 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 1
#define SOC_RTC_FAST_MEM_SUPPORTED 1
#define SOC_RTC_SLOW_MEM_SUPPORTED 1
#define SOC_I2S_SUPPORTED 1
@ -88,6 +87,8 @@
#define SOC_AES_SUPPORTED 1
#define SOC_MPI_SUPPORTED 1
#define SOC_SHA_SUPPORTED 1
#define SOC_FLASH_ENC_SUPPORTED 1
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- ADC CAPS ----------------------------------------*/
/**
@ -319,6 +320,15 @@
#define SOC_AES_SUPPORT_AES_192 (1)
#define SOC_AES_SUPPORT_AES_256 (1)
/*-------------------------- Secure Boot CAPS----------------------------*/
/*
* ESP32 ECO3 revision also supports `SOC_SECURE_BOOT_V2_RSA` but for that we will need selected ECO
* version from `Kconfig`, which is not possible while generating `Kconfig.soc_caps.in` from this header.
* Hence, for now we are handling this special capability in bootloader "security" configuration itself.
*/
#define SOC_SECURE_BOOT_V1 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (32)

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@ -35,14 +35,6 @@ config SOC_SUPPORTS_SECURE_DL_MODE
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
bool
default y
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default n
config SOC_EFUSE_KEY_PURPOSE_FIELD
bool
default n
@ -59,14 +51,6 @@ config SOC_RTC_SLOW_MEM_SUPPORTED
bool
default n
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default n
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_SHA_SUPPORTED
bool
default n
@ -75,6 +59,14 @@ config SOC_ECC_SUPPORTED
bool
default y
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_ADC_DIG_CTRL_SUPPORTED
bool
default y
@ -431,10 +423,26 @@ config SOC_TOUCH_SENSOR_NUM
int
default 0
config SOC_SECURE_BOOT_V2_ECC
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 32
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_128
bool
default n
config SOC_UART_NUM
int
default 2

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@ -33,16 +33,15 @@
#define SOC_WIFI_SUPPORTED 0 // Enable during bringup, IDF-3905
#define SOC_ASYNC_MEMCPY_SUPPORTED 1
#define SOC_SUPPORTS_SECURE_DL_MODE 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 1
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 0
#define SOC_EFUSE_KEY_PURPOSE_FIELD 0
#define SOC_EFUSE_CONSISTS_OF_ONE_KEY_BLOCK 1
#define SOC_RTC_FAST_MEM_SUPPORTED 0
#define SOC_RTC_SLOW_MEM_SUPPORTED 0
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 0
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_SHA_SUPPORTED 0 // This will be enabled with IDF-3830
#define SOC_ECC_SUPPORTED 1
#define SOC_FLASH_ENC_SUPPORTED 1
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- ADC CAPS -------------------------------*/
/*!< SAR ADC Module*/
@ -224,8 +223,14 @@
/*-------------------------- TOUCH SENSOR CAPS -------------------------------*/
#define SOC_TOUCH_SENSOR_NUM (0U) /*! No touch sensors on ESP32-C2 */
/*-------------------------- Secure Boot CAPS----------------------------*/
#define SOC_SECURE_BOOT_V2_ECC 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (32)
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_128 0 // This will be enabled with IDF-3899
/*-------------------------- UART CAPS ---------------------------------------*/
// ESP32-C2 has 2 UARTs

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@ -43,10 +43,6 @@ config SOC_TEMP_SENSOR_SUPPORTED
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_XT_WDT_SUPPORTED
bool
default y
@ -59,14 +55,6 @@ config SOC_SUPPORTS_SECURE_DL_MODE
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_EFUSE_KEY_PURPOSE_FIELD
bool
default y
@ -79,10 +67,6 @@ config SOC_RTC_SLOW_MEM_SUPPORTED
bool
default n
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_I2S_SUPPORTED
bool
default y
@ -119,6 +103,14 @@ config SOC_DIG_SIGN_SUPPORTED
bool
default y
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_AES_SUPPORT_DMA
bool
default y
@ -607,10 +599,34 @@ config SOC_TWAI_SUPPORTS_RX_STATUS
bool
default y
config SOC_SECURE_BOOT_V2_RSA
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 32
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_128
bool
default y
config SOC_UART_NUM
int
default 2

View File

@ -35,16 +35,12 @@
#define SOC_ASYNC_MEMCPY_SUPPORTED 1
#define SOC_USB_SERIAL_JTAG_SUPPORTED 1
#define SOC_TEMP_SENSOR_SUPPORTED 1
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_XT_WDT_SUPPORTED 1
#define SOC_WIFI_SUPPORTED 1
#define SOC_SUPPORTS_SECURE_DL_MODE 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_EFUSE_KEY_PURPOSE_FIELD 1
#define SOC_RTC_FAST_MEM_SUPPORTED 1
#define SOC_RTC_SLOW_MEM_SUPPORTED 0
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
#define SOC_I2S_SUPPORTED 1
#define SOC_RMT_SUPPORTED 1
#define SOC_SIGMADELTA_SUPPORTED 1
@ -54,6 +50,11 @@
#define SOC_SHA_SUPPORTED 1
#define SOC_HMAC_SUPPORTED 1
#define SOC_DIG_SIGN_SUPPORTED 1
#define SOC_FLASH_ENC_SUPPORTED 1
/* Secure boot is only supported in ESP32-C3 revision > ECO3. We check ECO revision in
* bootloader "security" configuration and accordingly prevent its usage for ECO2 and
* earlier revisions */
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- AES CAPS -----------------------------------------*/
#define SOC_AES_SUPPORT_DMA (1)
@ -291,8 +292,16 @@
#define SOC_TWAI_BRP_MAX 16384
#define SOC_TWAI_SUPPORTS_RX_STATUS 1
/*-------------------------- Secure Boot CAPS----------------------------*/
#define SOC_SECURE_BOOT_V2_RSA 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (32)
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_128 1
/*-------------------------- UART CAPS ---------------------------------------*/
// ESP32-C3 has 2 UARTs

View File

@ -47,10 +47,6 @@ config SOC_SUPPORTS_SECURE_DL_MODE
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_KEY_PURPOSE_FIELD
bool
default y
@ -67,10 +63,6 @@ config SOC_RTC_SLOW_MEM_SUPPORTED
bool
default n
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_I2S_SUPPORTED
bool
default y
@ -107,6 +99,14 @@ config SOC_ECC_SUPPORTED
bool
default n
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_AES_SUPPORT_DMA
bool
default y
@ -591,10 +591,34 @@ config SOC_TWAI_SUPPORTS_RX_STATUS
bool
default y
config SOC_SECURE_BOOT_V2_RSA
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 32
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_128
bool
default y
config SOC_UART_NUM
int
default 2

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@ -44,12 +44,10 @@
#define SOC_ASYNC_MEMCPY_SUPPORTED 1
#define SOC_USB_SERIAL_JTAG_SUPPORTED 1
#define SOC_SUPPORTS_SECURE_DL_MODE 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_KEY_PURPOSE_FIELD 1
#define SOC_TEMP_SENSOR_SUPPORTED 1
#define SOC_RTC_FAST_MEM_SUPPORTED 1
#define SOC_RTC_SLOW_MEM_SUPPORTED 0
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
#define SOC_I2S_SUPPORTED 1
#define SOC_RMT_SUPPORTED 1
#define SOC_SIGMADELTA_SUPPORTED 1
@ -59,6 +57,9 @@
#define SOC_HMAC_SUPPORTED 1
#define SOC_DIG_SIGN_SUPPORTED 1
#define SOC_ECC_SUPPORTED 0 // This will be enabled with IDF-3397
#define SOC_FLASH_ENC_SUPPORTED 1
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- AES CAPS -----------------------------------------*/
#define SOC_AES_SUPPORT_DMA (1)
@ -302,8 +303,16 @@
#define SOC_TWAI_BRP_MAX 16384
#define SOC_TWAI_SUPPORTS_RX_STATUS 1
/*-------------------------- Secure Boot CAPS----------------------------*/
#define SOC_SECURE_BOOT_V2_RSA 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (32)
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_128 1
/*-------------------------- UART CAPS ---------------------------------------*/
// ESP32-H2 has 2 UARTs

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@ -59,14 +59,6 @@ config SOC_ASYNC_MEMCPY_SUPPORTED
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_EFUSE_KEY_PURPOSE_FIELD
bool
default y
@ -79,14 +71,6 @@ config SOC_CACHE_SUPPORT_WRAP
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_256
bool
default y
config SOC_RTC_FAST_MEM_SUPPORTED
bool
default y
@ -103,10 +87,6 @@ config SOC_XT_WDT_SUPPORTED
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_I2S_SUPPORTED
bool
default y
@ -143,6 +123,14 @@ config SOC_DIG_SIGN_SUPPORTED
bool
default y
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_ADC_RTC_CTRL_SUPPORTED
bool
default y
@ -707,10 +695,38 @@ config SOC_AES_SUPPORT_GCM
bool
default y
config SOC_SECURE_BOOT_V2_RSA
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 64
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_128
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_256
bool
default y
config SOC_AES_CRYPTO_DMA
bool
default y

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@ -53,18 +53,13 @@
#define SOC_ULP_SUPPORTED 1
#define SOC_CCOMP_TIMER_SUPPORTED 1
#define SOC_ASYNC_MEMCPY_SUPPORTED 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_EFUSE_KEY_PURPOSE_FIELD 1
#define SOC_TEMP_SENSOR_SUPPORTED 1
#define SOC_CACHE_SUPPORT_WRAP 1
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_256 1
#define SOC_RTC_FAST_MEM_SUPPORTED 1
#define SOC_RTC_SLOW_MEM_SUPPORTED 1
#define SOC_PSRAM_DMA_CAPABLE 1
#define SOC_XT_WDT_SUPPORTED 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
#define SOC_I2S_SUPPORTED 1
#define SOC_RMT_SUPPORTED 1
#define SOC_SIGMADELTA_SUPPORTED 1
@ -74,6 +69,8 @@
#define SOC_SHA_SUPPORTED 1
#define SOC_HMAC_SUPPORTED 1
#define SOC_DIG_SIGN_SUPPORTED 1
#define SOC_FLASH_ENC_SUPPORTED 1
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- ADC CAPS ----------------------------------------*/
@ -332,8 +329,17 @@
#define SOC_AES_SUPPORT_DMA (1)
#define SOC_AES_SUPPORT_GCM (1)
/*-------------------------- Secure Boot CAPS----------------------------*/
#define SOC_SECURE_BOOT_V2_RSA 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (64)
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_128 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_256 1
/* Has "crypto DMA", which is shared with SHA */
#define SOC_AES_CRYPTO_DMA (1)

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@ -135,14 +135,6 @@ config SOC_SUPPORTS_SECURE_DL_MODE
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_EFUSE_KEY_PURPOSE_FIELD
bool
default y
@ -151,10 +143,6 @@ config SOC_SDMMC_HOST_SUPPORTED
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_RTC_FAST_MEM_SUPPORTED
bool
default y
@ -163,14 +151,6 @@ config SOC_RTC_SLOW_MEM_SUPPORTED
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_256
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_PSRAM_DMA_CAPABLE
bool
default y
@ -219,6 +199,14 @@ config SOC_DIG_SIGN_SUPPORTED
bool
default y
config SOC_FLASH_ENC_SUPPORTED
bool
default y
config SOC_SECURE_BOOT_SUPPORTED
bool
default y
config SOC_APPCPU_HAS_CLOCK_GATING_BUG
bool
default y
@ -839,10 +827,38 @@ config SOC_PM_SUPPORT_DEEPSLEEP_CHECK_STUB_ONLY
bool
default y
config SOC_SECURE_BOOT_V2_RSA
bool
default y
config SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS
int
default 3
config SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS
bool
default y
config SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY
bool
default y
config SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX
int
default 64
config SOC_FLASH_ENCRYPTION_XTS_AES
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_128
bool
default y
config SOC_FLASH_ENCRYPTION_XTS_AES_256
bool
default y
config SOC_WIFI_HW_TSF
bool
default y

View File

@ -44,15 +44,10 @@
#define SOC_CCOMP_TIMER_SUPPORTED 1
#define SOC_ASYNC_MEMCPY_SUPPORTED 1
#define SOC_SUPPORTS_SECURE_DL_MODE 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_EFUSE_KEY_PURPOSE_FIELD 1
#define SOC_SDMMC_HOST_SUPPORTED 1
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_RTC_FAST_MEM_SUPPORTED 1
#define SOC_RTC_SLOW_MEM_SUPPORTED 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_256 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
#define SOC_PSRAM_DMA_CAPABLE 1
#define SOC_XT_WDT_SUPPORTED 1
#define SOC_I2S_SUPPORTED 1
@ -65,6 +60,8 @@
#define SOC_SHA_SUPPORTED 1
#define SOC_HMAC_SUPPORTED 1
#define SOC_DIG_SIGN_SUPPORTED 1
#define SOC_FLASH_ENC_SUPPORTED 1
#define SOC_SECURE_BOOT_SUPPORTED 1
/*-------------------------- SOC CAPS ----------------------------------------*/
@ -364,10 +361,17 @@
#define SOC_PM_SUPPORT_DEEPSLEEP_CHECK_STUB_ONLY (1)
/*-------------------------- Secure Boot CAPS----------------------------*/
#define SOC_SECURE_BOOT_V2_RSA 1
#define SOC_EFUSE_SECURE_BOOT_KEY_DIGESTS 3
#define SOC_EFUSE_REVOKE_BOOT_KEY_DIGESTS 1
#define SOC_SUPPORT_SECURE_BOOT_REVOKE_KEY 1
/*-------------------------- Flash Encryption CAPS----------------------------*/
#define SOC_FLASH_ENCRYPTED_XTS_AES_BLOCK_MAX (64)
#define SOC_FLASH_ENCRYPTION_XTS_AES 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_128 1
#define SOC_FLASH_ENCRYPTION_XTS_AES_256 1
/*-------------------------- WI-FI HARDWARE TSF CAPS -------------------------------*/
#define SOC_WIFI_HW_TSF (1)