ESP32 Forum

Cpu frequency set to 160MHz ,everything works fine.
Cpu frequency set to 240MHz,it keep rebooting.

Error log:
rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:4
load:0x3fff0034,len:1212
load:0x40078000,len:11616
load:0x40080400,len:3208
entry 0x400805e4
ets Jun 8 2016 00:22:57

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:4
load:0x3fff0034,len:1212
load:0x40078000,len:11616
load:0x40080400,len:3208
entry 0x400805e4
ets Jun 8 2016 00:22:57

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00鷈ts Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
waiting for download

Hard to say. What devboard do you use? How do you power it? If over USB, can you try a thicker USB cable?

I use a esp32 devboard to test cpu freq 240M and it works fine with usb cable connect to pc usb port.
When change to the board integrated with multiple esp32 modules,the master esp32 module keeps rebooting at cpu freq 240MHz.
Neither USB nor charger can work.

Are you sure your power situation is OK? Could be that the chip is browning out because the 3.3V line dips.

Finally found that the chip I used can only support 160MHz,menu config change to 240MHz cause reboot.