chip_detect_error on ESP32-P4

[mutatrum]

When using espflash 3.1.1 on the P4 dev board, it fails to detect the chip:

$ espflash board-info
[2024-09-12T15:32:39Z INFO ] Serial port: '/dev/ttyUSB0'
[2024-09-12T15:32:39Z INFO ] Connecting...
[2024-09-12T15:32:39Z INFO ] Using flash stub
Error: espflash::chip_detect_error

  × Unrecognized magic value: 0xffffffff
  help: Supported chips are: esp32, esp32c2, esp32c3, esp32c6, esp32h2, esp32p4, esp32s2, esp32s3
        If your chip is supported, try hard-resetting the device and try again

Hard resetting results in the same error.

Flashing a C build with EPS-IDF works fine over the same ttyUSB0. Not sure which details can be provided that would help here.

[mutatrum]

Addition: I got a different magic value, but only once?
Unrecognized magic value: 0x61632220

[mutatrum]

It seems the magic value detection is no longer working for the P4:

We have recently found out that the magic number autodetection method is not reliable for ESP32-P4, as the value at the arbitrary address (CHIP_DETECT_MAGIC_REG_ADDR) can change between runs. Due to this, we are now considering changing the address (for all of the previous targets as well).

Fortunately, this is shouldn't be a big deal for P4, as autodetection based on the magic number is just a fallback method. The get_security_info method is primarily used and reliable.

espressif/esptool#1008 (comment)

[SergioGasquez]

Thanks for sharing your findings! We are currently not very focused on P4, since its not yet on mass production. The P4 version that I have is quite old, and I was able to flash it with the magic value that we currently have. We would of course accept and appreciate any PR updating this!