esp32c6 with w5500 for otbr (IDFGH-14300)

[gparvind]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I have setup otbr (ot_br example project) using esp32c6 for thread and spi w5500 for ethernet. I am able to create thread network and join other nodes as well.
However I keep getting multiple erros with this like:

E (39407) OPENTHREAD: Failed to get LL address, error: Invalid If index
W(40237) OPENTHREAD:[W] DuaManager----: Failed to perform next registration: NotFound

With increased spi clock speed ~36) I get other errors like:

E (925) w5500.mac: W5500 version mismatched, expected 0x04, got 0x80
E (925) w5500.mac: emac_w5500_init(826): verify chip ID failed
I (935) gpio: GPIO[4]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
E (935) esp_eth: esp_eth_driver_install(228): init mac failed
ESP_ERROR_CHECK failed: esp_err_t 0x10a (ESP_ERR_INVALID_VERSION) at 0x4201b706

I would like to understand whether it's a software issue (I do see an issue reported for LL address one) or hardware setup issue or the chip is just not powerful enough to be directly used for handling thread and ethernet communication with single cpu for otbr.

Other infos:

• esp idf is 5.3.2
• esp module is Beetle ESP32 C6 Mini Development Board
• w5500 spi module is powered by 3.3v output pin of the esp32 dev board.