ESP32 Forum

hello,
I am trying to program an esp32-wroom-32d module, purchased on lcsc.com site, mounted on a classical NodeMCU board.
Programming using the Arduino IDE fails. I have tried all known tricks (press BOOT, capacitor on EN pin, low baud rate, ....). It always fails.
There is a particular thing: pressing the RST button, which should force a reset, I see the following sequence on the serial terminal:

I (10) boot: ESP-IDF v3.0.7 2nd stage bootloader
I (10) boot: compile time 09:04:31
I (16) boot: Enabling RNG early entropy source...
I (16) boot: SPI Speed : 40MHz
I (18) boot: SPI Mode : DIO
I (22) boot: SPI Flash Size : 4MB
I (26) boot: Partition Table:
I (29) boot: ## Label Usage Type ST Offset Length
I (37) boot: 0 phy_init RF data 01 01 0000f000 00001000
I (44) boot: 1 otadata OTA data 01 00 00010000 00002000
I (52) boot: 2 nvs WiFi data 01 02 00012000 0000e000
I (59) boot: 3 at_customize unknown 40 00 00020000 000e0000
I (66) boot: 4 ota_0 OTA app 00 10 00100000 00180000
I (74) boot: 5 ota_1 OTA app 00 11 00280000 00180000
I (81) boot: End of partition table
I (86) boot: No factory image, trying OTA 0
I (90) esp_image: segment 0: paddr=0x00100020 vaddr=0x3f400020 size=0x20614 (132628) map
I (146) esp_image: segment 1: paddr=0x0012063c vaddr=0x3ffc0000 size=0x02d7c ( 11644) load
I (151) esp_image: segment 2: paddr=0x001233c0 vaddr=0x40080000 size=0x00400 ( 1024) load
I (153) esp_image: segment 3: paddr=0x001237c8 vaddr=0x40080400 size=0x0c848 ( 51272) load
I (183) esp_image: segment 4: paddr=0x00130018 vaddr=0x400d0018 size=0xdfc80 (916608) map
I (504) esp_image: segment 5: paddr=0x0020fca0 vaddr=0x4008cc48 size=0x02504 ( 9476) load
I (508) esp_image: segment 6: paddr=0x002121ac vaddr=0x400c0000 size=0x00064 ( 100) load
I (520) boot: Loaded app from partition at offset 0x100000
I (520) boot: Disabling RNG early entropy source...
1.1.3
I (621) wifi: wifi firmware version: 703e53b
I (622) wifi: config NVS flash: enabled
I (622) wifi: config nano formating: disabled
I (632) wifi: Init dynamic tx buffer num: 32
I (632) wifi: Init data frame dynamic rx buffer num: 32
I (632) wifi: Init management frame dynamic rx buffer num: 32
I (638) wifi: wifi driver task: 3ffdeeb8, prio:23, stack:3584
I (643) wifi: Init static rx buffer num: 10
I (646) wifi: Init dynamic rx buffer num: 32
I (651) wifi: wifi power manager task: 0x3ffe369c prio: 21 stack: 2560
I (686) wifi: mode : softAP (94:3c:c6:9b:ac:11)
I (693) wifi: mode : sta (94:3c:c6:9b:ac:10) + softAP (94:3c:c6:9b:ac:11)
I (697) wifi: mode : softAP (94:3c:c6:9b:ac:11)
I (701) wifi: set country: cc=CN schan=1 nchan=13 policy=1

In the row 86 I read "no factory image".
May be that the module need a preliminary setup (the "factory image")?
Has this ever happened to anyone?
Thank you
Gianluca

You can ignore that message; it refers to the fact that you can have a 'factory' partition that contains fallback, known good firmware that is put in there in your factory in the situation you are building a commercially developed product. You can configure the bootloader so that on e.g. a button press, you can go back to that firmware. By default, however, Arduino doesn't create a partition like that (because it's a bit wasteful on flash), and that's what the message refers to.

Hi,
I am experiencing an identical issue. The issue is an ESP32 WROOM 32 purchased from LCSC recently that does not enter serial flash boot mode. I am receiving the same message as Gianluca's post when resetting the esp32 as well as the following message when I attempt to put the esp32 into boot mode via holding BOOT and RST low then releasing RST.

rst:0x1 (POWERON_RESET),boot:0xb (HSPI_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0xb (HSPI_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0xb (HSPI_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

Is the problem perhaps that these ESP32 chips were not configured correctly from the factory seeing that the chips used by Gianluca and I have may have come from the same batch? Is anyone also able to explain the meaning of the above serial readout and the serial readout from Gianluca's post?
I am unable to post schematic files of the circuit however I am confident that it is not a hardware problem since I was able to program an identical circuit in the past. I am using an FTDI connection to program the board.
Any advice is appreciated,
Cheers.

I don't know what you see that appears identical to the OP. It looks like you have a pull-up on GPIO2 which is preventing the device from entering download mode.
https://github.com/espressif/esptool/wi ... read-error