用ESP32的纯芯片设计的电路板，MCU不断重启的原因？

我们的硬件工程师设计了一款PCBA实现项目功能，需要将一些数据保存到外置flash, 我在调试的时候发现只要初始化了华邦的SPI flash的片选引脚，MCU就会不断的重启（所有看门狗都已经关闭），不初始化这个引脚就不会重启，导致flash无法使用，搞不懂时什么原因？

entry 0x40080678

I (54) boot: ESP-IDF v4.3.1-dirty 2nd stage bootloader

I (54) boot: compile time 17:30:11

I (54) boot: chip revision: 3

I (58) boot_comm: chip revision: 3, min. bootloader chip revision: 0

I (74) boot.esp32: SPI Speed      : 40MHz

I (74) boot.esp32: SPI Mode       : DIO

I (74) boot.esp32: SPI Flash Size : 4MB

W (79) boot.esp32: PRO CPU has been reset by WDT.

W (84) boot.esp32: WDT reset info: PRO CPU PC=0x400803c0

0x400803c0: _DoubleExceptionVector at D:/ESP32_GIT/components/freertos/port/xtensa/xtensa_vectors.S:455



W (90) boot.esp32: WDT reset info: APP CPU PC=0x400e6202 (waiti mode)

0x400e6202: esp_pm_impl_waiti at D:/ESP32_GIT/components/esp_pm/pm_impl.c:829



I (97) boot: Enabling RNG early entropy source...

I (103) boot: Partition Table:

I (106) boot: ## Label            Usage          Type ST Offset   Length

I (114) boot:  0 nvs              WiFi data        01 02 00009000 00006000

I (121) boot:  1 phy_init         RF data          01 01 0000f000 00001000

I (129) boot:  2 factory          factory app      00 00 00010000 00100000

I (136) boot: End of partition table

I (141) boot_comm: chip revision: 3, min. application chip revision: 0

I (148) esp_image: segment 0: paddr=00010020 vaddr=3f400020 size=08dd4h ( 36308) map

I (170) esp_image: segment 1: paddr=00018dfc vaddr=3ffb0000 size=029bch ( 10684) load

I (174) esp_image: segment 2: paddr=0001b7c0 vaddr=40080000 size=04858h ( 18520) load

I (183) esp_image: segment 3: paddr=00020020 vaddr=400d0020 size=167d4h ( 92116) map

I (217) esp_image: segment 4: paddr=000367fc vaddr=40084858 size=07d44h ( 32068) load

I (231) esp_image: segment 5: paddr=0003e548 vaddr=50000000 size=00010h (    16) load

I (237) boot: Loaded app from partition at offset 0x10000

I (237) boot: Disabling RNG early entropy source...

I (251) cpu_start: Pro cpu up.

I (251) cpu_start: Starting app cpu, entry point is 0x400810a0

0x400810a0: call_start_cpu1 at D:/ESP32_GIT/components/esp_system/port/cpu_start.c:141



I (0) cpu_start: App cpu up.

I (265) cpu_start: Pro cpu start user code

I (265) cpu_start: cpu freq: 160000000

I (265) cpu_start: Application information:

I (270) cpu_start: Project name:     play_mp3_pwm_or_dac

I (276) cpu_start: App version:      v2.3-99-g107e8c3-dirty

I (282) cpu_start: Compile time:     Jul 11 2022 10:32:05

I (288) cpu_start: ELF file SHA256:  0853114b73ceec0c...

I (294) cpu_start: ESP-IDF:          v4.3.1-dirty

I (300) heap_init: Initializing. RAM available for dynamic allocation:

I (307) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM

I (313) heap_init: At 3FFB32E8 len 0002CD18 (179 KiB): DRAM

I (319) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM

I (325) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM

I (332) heap_init: At 4008C59C len 00013A64 (78 KiB): IRAM

I (339) spi_flash: detected chip: winbond

I (343) spi_flash: flash io: dio

I (348) cpu_start: Starting scheduler on PRO CPU.

I (0) cpu_start: Starting scheduler on APP CPU.entry 0x40080678

I (54) boot: ESP-IDF v4.3.1-dirty 2nd stage bootloader

I (54) boot: compile time 17:30:11

I (54) boot: chip revision: 3

I (58) boot_comm: chip revision: 3, min. bootloader chip revision: 0

I (74) boot.esp32: SPI Speed      : 40MHz

I (74) boot.esp32: SPI Mode       : DIO

I (74) boot.esp32: SPI Flash Size : 4MB

W (79) boot.esp32: PRO CPU has been reset by WDT.

W (84) boot.esp32: WDT reset info: PRO CPU PC=0x400803c0

0x400803c0: _DoubleExceptionVector at D:/ESP32_GIT/components/freertos/port/xtensa/xtensa_vectors.S:455



W (90) boot.esp32: WDT reset info: APP CPU PC=0x400e6202 (waiti mode)

0x400e6202: esp_pm_impl_waiti at D:/ESP32_GIT/components/esp_pm/pm_impl.c:829



I (97) boot: Enabling RNG early entropy source...

I (103) boot: Partition Table:

I (106) boot: ## Label            Usage          Type ST Offset   Length

I (114) boot:  0 nvs              WiFi data        01 02 00009000 00006000

I (121) boot:  1 phy_init         RF data          01 01 0000f000 00001000

I (129) boot:  2 factory          factory app      00 00 00010000 00100000

I (136) boot: End of partition table

I (141) boot_comm: chip revision: 3, min. application chip revision: 0

I (148) esp_image: segment 0: paddr=00010020 vaddr=3f400020 size=08dd4h ( 36308) map

I (170) esp_image: segment 1: paddr=00018dfc vaddr=3ffb0000 size=029bch ( 10684) load

I (174) esp_image: segment 2: paddr=0001b7c0 vaddr=40080000 size=04858h ( 18520) load

I (183) esp_image: segment 3: paddr=00020020 vaddr=400d0020 size=167d4h ( 92116) map

I (217) esp_image: segment 4: paddr=000367fc vaddr=40084858 size=07d44h ( 32068) load

I (231) esp_image: segment 5: paddr=0003e548 vaddr=50000000 size=00010h (    16) load

I (237) boot: Loaded app from partition at offset 0x10000

I (237) boot: Disabling RNG early entropy source...

I (251) cpu_start: Pro cpu up.

I (251) cpu_start: Starting app cpu, entry point is 0x400810a0

0x400810a0: call_start_cpu1 at D:/ESP32_GIT/components/esp_system/port/cpu_start.c:141



I (0) cpu_start: App cpu up.

I (265) cpu_start: Pro cpu start user code

I (265) cpu_start: cpu freq: 160000000

I (265) cpu_start: Application information:

I (270) cpu_start: Project name:     play_mp3_pwm_or_dac

I (276) cpu_start: App version:      v2.3-99-g107e8c3-dirty

I (282) cpu_start: Compile time:     Jul 11 2022 10:32:05

I (288) cpu_start: ELF file SHA256:  0853114b73ceec0c...

I (294) cpu_start: ESP-IDF:          v4.3.1-dirty

I (300) heap_init: Initializing. RAM available for dynamic allocation:

I (307) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM

I (313) heap_init: At 3FFB32E8 len 0002CD18 (179 KiB): DRAM

I (319) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM

I (325) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM

I (332) heap_init: At 4008C59C len 00013A64 (78 KiB): IRAM

I (339) spi_flash: detected chip: winbond

I (343) spi_flash: flash io: dio

I (348) cpu_start: Starting scheduler on PRO CPU.

I (0) cpu_start: Starting scheduler on APP CPU.