ESP8266 Community Forum

Hello everybody.

My esp-07 module (14 pins old version) has stopped working properly without a reason. I am able to flash my program but it refuses to boot. It complains about illegal instruction at boot time. It doesn't matter what program I flash (it just changes the address of illegal instruction displayed in exception output).
I've been working with eclipse and esptool.exe and I changed to ESP flash download tool v2.4 (albeit title of GUI window shows v2.3) just to get more info. This tools warns about EFUSE VAL ERROR...

I am quite desperate now.
Has anyone an idea of what's happening here?

Thanks in advance.

BR,
Miguel.

Nobody can help me? None comment about?
Really?

This chip is awesome, in spite of the lack of a program protection mechanism. But I'm very worried about this issue that makes me reconsider keep on using it in the future...

First, power-up your board and checking the voltage on pins:
GPIO15
GPIO2
GPIO0
Refer to https://github.com/esp8266/esp8266-wiki ... ot-Process , it should be : L H H
If it not, may be you must use pull-ups (for GPIO0,2) and pulldown (for GPIO15) resistor.

I don't think that is the problem.
I can flash and read back. When power on normal mode, bootloader seems to work properly until entering in user program. Here is the log output:

ets Jan 8 2013,rst cause:1, boot mode:(3,7)

load 0x40100000, len 31036, room 16
tail 12
chksum 0xfd
ho 0 tail 12 room 4
load 0x3ffe8000, len 2104, room 12
tail 12
chksum 0xf6
ho 0 tail 12 room 4
load 0x3ffe8840, len 11988, room 12
tail 8
chksum 0x22
csum 0x22
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x4020ca08, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
....

Anyway, I will double check the voltage just to be sure.

Thanks tuongpv!