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External RAM failed memory test
Posted: Tue Nov 26, 2019 10:44 pm
by 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!
Re: External RAM failed memory test
Posted: Tue Nov 26, 2019 11:23 pm
by WiFive
Which wrover? idf version? sdkconfig?
Re: External RAM failed memory test
Posted: Wed Nov 27, 2019 7:53 am
by ESP_Sprite
Also, can you give any details on the hardware you're using the module in?
Re: External RAM failed memory test
Posted: Wed Dec 11, 2019 9:22 am
by 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!
Re: External RAM failed memory test
Posted: Sun Feb 09, 2020 1:59 pm
by 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.