diff --git a/components/bootloader_support/include/bootloader_common.h b/components/bootloader_support/include/bootloader_common.h
index 0723d19512..6b04f59533 100644
--- a/components/bootloader_support/include/bootloader_common.h
+++ b/components/bootloader_support/include/bootloader_common.h
@@ -105,6 +105,15 @@ bool bootloader_common_label_search(const char *list, char *label);
  */
 void bootloader_configure_spi_pins(int drv);
 
+/**
+ * @brief Get flash CS IO
+ *
+ * Can be determined by eFuse values, or the default value
+ *
+ * @return Flash CS IO
+ */
+uint8_t bootloader_flash_get_cs_io(void);
+
 /**
  * @brief Calculates a sha-256 for a given partition or returns a appended digest.
  *
diff --git a/components/bootloader_support/src/bootloader_common.c b/components/bootloader_support/src/bootloader_common.c
index 0a081679b9..0fb2a48bb2 100644
--- a/components/bootloader_support/src/bootloader_common.c
+++ b/components/bootloader_support/src/bootloader_common.c
@@ -29,6 +29,7 @@
 #include "esp_rom_crc.h"
 #include "esp_rom_gpio.h"
 #include "esp_rom_sys.h"
+#include "esp_rom_efuse.h"
 #include "esp_flash_partitions.h"
 #include "bootloader_flash_priv.h"
 #include "bootloader_common.h"
@@ -192,8 +193,19 @@ void bootloader_common_vddsdio_configure(void)
 #endif // CONFIG_BOOTLOADER_VDDSDIO_BOOST
 }
 
-
 RESET_REASON bootloader_common_get_reset_reason(int cpu_no)
 {
     return rtc_get_reset_reason(cpu_no);
 }
+
+uint8_t bootloader_flash_get_cs_io(void)
+{
+    uint8_t cs_io;
+    const uint32_t spiconfig = esp_rom_efuse_get_flash_gpio_info();
+    if (spiconfig == ESP_ROM_EFUSE_FLASH_DEFAULT_SPI) {
+        cs_io = SPI_CS0_GPIO_NUM;
+    } else {
+        cs_io = (spiconfig >> 18) & 0x3f;
+    }
+    return cs_io;
+}
diff --git a/components/esp32/include/esp32/spiram.h b/components/esp32/include/esp32/spiram.h
index ccbca2c0b8..0e9aeeaed8 100644
--- a/components/esp32/include/esp32/spiram.h
+++ b/components/esp32/include/esp32/spiram.h
@@ -89,6 +89,15 @@ size_t esp_spiram_get_size(void);
  */
 void esp_spiram_writeback_cache(void);
 
+/**
+ * @brief get psram CS IO
+ *
+ * This interface should be called after PSRAM is enabled, otherwise it will
+ * return an invalid value -1/0xff.
+ *
+ * @return psram CS IO or -1/0xff if psram not enabled
+ */
+uint8_t esp_spiram_get_cs_io(void);
 
 
 /**
diff --git a/components/esp32/spiram.c b/components/esp32/spiram.c
index e43acad59d..e7ee354cfd 100644
--- a/components/esp32/spiram.c
+++ b/components/esp32/spiram.c
@@ -296,4 +296,8 @@ bool esp_spiram_is_initialized(void)
     return spiram_inited;
 }
 
+uint8_t esp_spiram_get_cs_io(void)
+{
+    return psram_get_cs_io();
+}
 #endif
diff --git a/components/esp32/spiram_psram.c b/components/esp32/spiram_psram.c
index 0e329fc6d9..8a289c174b 100644
--- a/components/esp32/spiram_psram.c
+++ b/components/esp32/spiram_psram.c
@@ -203,6 +203,13 @@ typedef struct {
 
 static void IRAM_ATTR psram_cache_init(psram_cache_mode_t psram_cache_mode, psram_vaddr_mode_t vaddrmode);
 
+static uint8_t s_psram_cs_io = (uint8_t)-1;
+
+uint8_t psram_get_cs_io(void)
+{
+    return s_psram_cs_io;
+}
+
 static void psram_clear_spi_fifo(psram_spi_num_t spi_num)
 {
     int i;
@@ -844,6 +851,7 @@ esp_err_t IRAM_ATTR psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vad
         ESP_EARLY_LOGE(TAG, "Not a valid or known package id: %d", pkg_ver);
         abort();
     }
+    s_psram_cs_io = psram_io.psram_cs_io;
 
     const uint32_t spiconfig = esp_rom_efuse_get_flash_gpio_info();
     if (spiconfig == ESP_ROM_EFUSE_FLASH_DEFAULT_SPI) {
diff --git a/components/esp32/spiram_psram.h b/components/esp32/spiram_psram.h
index 14f06cb41d..cd15d1115d 100644
--- a/components/esp32/spiram_psram.h
+++ b/components/esp32/spiram_psram.h
@@ -67,4 +67,11 @@ psram_size_t psram_get_size(void);
  */
 esp_err_t psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vaddrmode);
 
+/**
+ * @brief get psram CS IO
+ *
+ * @return psram CS IO
+ */
+uint8_t psram_get_cs_io(void);
+
 #endif
diff --git a/components/esp32s2/include/esp32s2/spiram.h b/components/esp32s2/include/esp32s2/spiram.h
index cc2b4c8549..7799182ba2 100644
--- a/components/esp32s2/include/esp32s2/spiram.h
+++ b/components/esp32s2/include/esp32s2/spiram.h
@@ -78,6 +78,15 @@ size_t esp_spiram_get_size(void);
  */
 void esp_spiram_writeback_cache(void);
 
+/**
+ * @brief get psram CS IO
+ *
+ * This interface should be called after PSRAM is enabled, otherwise it will
+ * return an invalid value -1/0xff.
+ *
+ * @return psram CS IO or -1/0xff if psram not enabled
+ */
+uint8_t esp_spiram_get_cs_io(void);
 
 
 /**
diff --git a/components/esp32s2/spiram.c b/components/esp32s2/spiram.c
index 3c0eaa4f8f..6b0c7f2a61 100644
--- a/components/esp32s2/spiram.c
+++ b/components/esp32s2/spiram.c
@@ -376,6 +376,11 @@ void IRAM_ATTR esp_spiram_writeback_cache(void)
 
 
 
+uint8_t esp_spiram_get_cs_io(void)
+{
+    return psram_get_cs_io();
+}
+
 /*
  Simple RAM test. Writes a word every 32 bytes. Takes about a second to complete for 4MiB. Returns
  true when RAM seems OK, false when test fails. WARNING: Do not run this before the 2nd cpu has been
@@ -414,4 +419,5 @@ bool esp_spiram_test(void)
         return true;
     }
 }
+
 #endif
diff --git a/components/esp32s2/spiram_psram.c b/components/esp32s2/spiram_psram.c
index b6bd73c70a..cf971f7e3b 100644
--- a/components/esp32s2/spiram_psram.c
+++ b/components/esp32s2/spiram_psram.c
@@ -168,6 +168,13 @@ static uint32_t s_psram_id = 0;
 static void IRAM_ATTR psram_cache_init(psram_cache_mode_t psram_cache_mode, psram_vaddr_mode_t vaddrmode);
 extern void esp_rom_spi_set_op_mode(int spi_num, esp_rom_spiflash_read_mode_t mode);
 
+static uint8_t s_psram_cs_io = (uint8_t)-1;
+
+uint8_t psram_get_cs_io(void)
+{
+    return s_psram_cs_io;
+}
+
 static void psram_set_op_mode(int spi_num, psram_cmd_mode_t mode)
 {
     if (mode == PSRAM_CMD_QPI) {
@@ -375,6 +382,7 @@ static void IRAM_ATTR psram_gpio_config(psram_cache_mode_t mode)
         psram_io.psram_spiwp_sd3_io = esp_rom_efuse_get_flash_wp_gpio();
     }
     esp_rom_spiflash_select_qio_pins(psram_io.psram_spiwp_sd3_io, spiconfig);
+    s_psram_cs_io = psram_io.psram_cs_io;
 }
 
 psram_size_t psram_get_size(void)
diff --git a/components/esp32s2/spiram_psram.h b/components/esp32s2/spiram_psram.h
index ea7908f030..6ad464a0cb 100644
--- a/components/esp32s2/spiram_psram.h
+++ b/components/esp32s2/spiram_psram.h
@@ -76,5 +76,11 @@ typedef enum {
 
 esp_err_t esp_spiram_wrap_set(spiram_wrap_mode_t mode);
 
+/**
+ * @brief get psram CS IO
+ *
+ * @return psram CS IO
+ */
+uint8_t psram_get_cs_io(void);
 
 #endif