Chapter 5. Hardware related
5.6 Production Test
5.6.1 Why can some modules download rmware normally when using DIO/DOUT, but
encounter program abnormality when using QOUT/QIO?
• Firstly, please check the modes supported by ash in the module and whether the module routing meets the
requirements of modes.
• Secondly, please check the QE bit of the status register of ash, which determines whether the ash supports
the QUAD mode or not.
• Dierent ESP chips/modules use ashes from dierent manufacturers. Some ashes have QE disabled by
default. Thus, it is necessary to check whether the ash supports Quad mode through actual testing.
• When ROM boots a second stage bootloader, the secondary read will fail if the conguration parameters are
read in the QIO mode because the QE bit is disabled.
• It is recommended to program rmware in the DIO mode and to congure the QIO mode in menuconfig.
The conguration enables the QE bit in the second stage bootloader and then boots the app bin to use the
QUAD mode.
5.6.2 How to get the production test tool?
CHIP: ESP32 | ESP8266
• Please click production test tool to download.
5.6.3 When I use the esptool.py burn_custom_mac command to write the
user-dened MAC address, why is the MAC address read by the esptool.py
read_mac command still factory default?
• The esptool.py read_mac command can only read the MAC address written in eFuse BLOCK0 by
default, but the user-dened MAC address written with the esptool.py burn_custom_mac command
is in eFuse BLOCK3. You may use the espefuse.py get_custom_mac command to check the MAC
address written to eFuse BLOCK3.
• For more information, please refer to esptool documentation.
5.6.4 When downloading bin les to ESP32-WROVER-E (16 MB ash) using Flash
Download Tool, multiple separate bin les can be downloaded successfully, but
downloading the combined rmware (12 MB) failed. Why?
Since the combined rmware is mostly “0xFF”with relatively high compression rate, the amount of
data after decompression would be relatively large for the same length of compressed data, resulting in
a timeout error (default 7 seconds) after a long download time. To solve this issue, in Flash Download
Tool, go to configure > esp32 > spi_download, and disable the compression conguration
option as follows:
compress = False
no_compress = True
Espressif Systems 168
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