External RAM failed memory test

[chrismerck]

Is there a known hardware issue with WROVER modules having intermittent "External RAM failed memory test"?

We've seen a few dozen units with this problem that prevents boot after a few days of operation, so unfortunately we did not catch in post-production test:

Code: Select all

E (1547) spiram: SPI SRAM memory test fail. 127917/131072 writes failed, first @ 3F800000
E (1547) cpu_start: External RAM failed memory test!

[WiFive]

Which wrover? idf version? sdkconfig?

[ESP_Sprite]

Also, can you give any details on the hardware you're using the module in?

[gryphon]

I have also one Wrover B module chip rev 1 with same behavior. Board is a custom design and idf version is 3.3
10 boards have been tested extensively and one have started failing after months of use.
It usually fails after flashing. It seems that heat has some effect, since the failure usually disappears after several reset loops.
I have not yet seen any unusual behavior during operation.

E (1582) spiram: SPI SRAM memory test fail. 7/131072 writes failed, first @ 3F8E6F00
E (1582) cpu_start: External RAM failed memory test!

[jgustavoam]

"Board is a personalized design"
Post the schematic diagram of this board.
There are some restrictions on the use of the SPI interface on ESP32.
It may be that your problem is violating these restrictions.