Download mode crash on new ESP32-S3

[zhiliao]

Hi,

We have a PCB with ESP-S3FH4R2 on which we want to disable jtag. But it always crashes when it enters download mode after a single

Code: Select all

espefuse.py -p /dev/ttyACM0 --do-not-confirm burn_efuse DIS_USB_SERIAL_JTAG

.

Here is the log

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ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x21 (DOWNLOAD(USB/UART0))
waiting for download
Guru Meditation Error: Core 0 panic'ed (LoadProhibited)
Core 0 register dump:
PC      : 0x400511b1  PS      : 0x00060330  A0      : 0x80049188  A1      : 0x3fceb640
A2      : 0x00000000  A3      : 0x3ff1e3fb  A4      : 0x00000001  A5      : 0x00000000
A6      : 0x00000000  A7      : 0x00000088  A8      : 0x800533dc  A9      : 0x3fceb620
A10     : 0xfffffffb  A11     : 0x3fceeebc  A12     : 0x3fceefbc  A13     : 0x00000000
A14     : 0x00000000  A15     : 0x00000006  SAR     : 0x0000000f  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000  LBEG    : 0x400570e8  LEND    : 0x400570f3  LCOUNT  : 0x00000000

Backtrace: 0x400511b1:0x3fceb640 0x40049185:0x3fceb670 0x400491e5:0x3fceb690 0x40043917:0x3fceb6b0 0x4004392a:0x3fceb6d0 0x40043c33:0x3fceb6f0 0x40034c45:0x3fceb710

We did burn DIS_USB_SERIAL_JTAG on ESP-S3FH4R2 last year and there was no issue. We also found a ESP-S3FH4R2 chip bought last year and soldered it to the new PCB. It runs well after burning DIS_USB_SERIAL_JTAG.
There is a few posts which show the same backtrace on this forum:
https://esp32.com/viewtopic.php?t=34013 , Jun 07, 2023
https://esp32.com/viewtopic.php?t=35529 , Aug 31, 2023


The NEW chip: ESP32-S3 142023 FH4R2P3K4470 MNP632000 FB02PVF496
The OLD chip: ESP32-S3 122022 FH4R2PPG7210 MNN889000 FB00PMT788
Steps:
1. Burn efuse DIS_USB_SERIAL_JTAG on chips without flashing them
2. Enter download mode by pull IO0 down and reset
Result:
Download mode crashes on NEW Chip and runs on OLD chip.

[zhiliao]

Any chance to fix it by updating bootloader or something else? If not, is it safe to leave DIS_USB_SERIAL_JTAG unchanged on a public released product when DIS_USB_JTAG burned already?