espressif download tool got chip efuse check error

[ansonc]

hi, I have a EVB designed on reference of ESP-WROOM-02 with CH340 as usb2serial interface. I tried to download image with esptool.py in linux, the downloading was success but failed to boot. I used espressif download tool in Windows system, and got efuse check error as the following.

What could it be possibly wrong? Please take a look. Many thanks.

[ansonc]

The flash I used on board is W25Q64JVSSIQ, 64Mbit SPI flash from Winbond.
And the SDK is ESP8266_NONOS_SDK_V2.0.0_16_08_10.
I was able to read the mac of the chip in Linux system with command of

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sudo esptool.py read_mac

, which indicated the normal function of the uart interface.
The wired thing is when I changed the size of flash to 2MB of command

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esptool.py write_flash

, the chip managed to boot up, while 4MB or 8MB failed.
The command line I used is

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sudo esptool.py --port /dev/ttyUSB0 write_flash -fm qio -fs [size=150]2MB[/size] 0  ../bin/boot_v1.6.bin 0x1000 ../bin/upgrade/user1.4096.new.6.bin  0x1fb000 ../bin/blank.bin 0x1fc000 ../bin/esp_init_data_default.bin 0x1fe000 ../bin/blank.bin


.
Can anyone help me out please? Many thanks.