ESP32不断重启,无法加载app区域是什么原因引起的？

用的芯片是esp32-u4wd,编译sdk默认例子hello-world,下载到板子上无法启动,一直看门狗复位,无法进入到app部份,能正常加载bootloader,停留在cpu_start: Pro cpu up,过几秒钟就看门狗复位重启了,请问这是什么原因引起的?下面是启动的log打印



rst:0x10 (RTCWDT_RTC_RESET),boot:0x12 (SPI_FAST_FLASH_BOOT)

configsip: 188777542, SPIWP:0xee

clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00

mode:DIO, clock div:1

load:0x3fff0030,len:6980

load:0x40078000,len:14336

ho 0 tail 12 room 4

load:0x40080400,len:3708

0x40080400: _init at ??:?



entry 0x40080680

I (30) boot: ESP-IDF v4.3.1 2nd stage bootloader

I (30) boot: compile time 10:21:39

I (30) boot: chip revision: 3

I (33) boot_comm: chip revision: 3, min. bootloader chip revision: 0

I (40) boot.esp32: SPI Speed      : 80MHz

I (45) boot.esp32: SPI Mode       : DIO

I (49) boot.esp32: SPI Flash Size : 4MB

I (54) boot: Enabling RNG early entropy source...

I (59) boot: Partition Table:

I (63) boot: ## Label            Usage          Type ST Offset   Length

I (70) boot:  0 nvs              WiFi data        01 02 00009000 00004000

I (77) boot:  1 otadata          OTA data         01 00 0000d000 00002000

I (85) boot:  2 phy_init         RF data          01 01 0000f000 00001000

I (92) boot:  3 factory          factory app      00 00 00010000 00100000

I (100) boot:  4 ota_0            OTA app          00 10 00110000 00100000

I (107) boot:  5 ota_1            OTA app          00 11 00210000 00100000

I (115) boot: End of partition table

I (119) boot: Defaulting to factory image

I (124) boot_comm: chip revision: 3, min. application chip revision: 0

I (131) esp_image: segment 0: paddr=00010020 vaddr=3f400020 size=06d24h ( 27940) map

I (148) esp_image: segment 1: paddr=00016d4c vaddr=3ffb0000 size=028e0h ( 10464) load

I (152) esp_image: segment 2: paddr=00019634 vaddr=40080000 size=069e4h ( 27108) load

I (166) esp_image: segment 3: paddr=00020020 vaddr=400d0020 size=13b88h ( 80776) map

I (191) esp_image: segment 4: paddr=00033bb0 vaddr=400869e4 size=04328h ( 17192) load

I (197) esp_image: segment 5: paddr=00037ee0 vaddr=50000000 size=00010h (    16) load

I (203) boot: Loaded app from partition at offset 0x10000

I (203) boot: Disabling RNG early entropy source...

I (219) cpu_start: Pro cpu up.