Boot issue - SPI SRAM memory test fail

[retr...@gmail.com]

Hey everyone,

Went to boot my 8080esp and it wasn't coming up.  Looking at the serial console, it appears the unit is stuck in a loop with the following error during POST:

E (845) spiram: SPI SRAM memory test fail. 29/131072 writes failed, first @ 3F8DEEA0

E (845) cpu_start: External RAM failed memory test!

abort() was called at PC 0x40081baf on core 0

ELF file SHA256: 531fcea06cfc29b2736b3f96a07b400ba3cd6d4258b78d38e4e85ec019555efa

Backtrace: 0x40091cd4:0x3ffe3c10 0x400920d5:0x3ffe3c30 0x40081baf:0x3ffe3c50 0x40078e74:0x3ffe3c90 |<-CORRUPTED

Rebooting...

Is this a problem with the esp32 module itself, or is there somewhere else in the system I need to investigate?  Up until this most recent powerup, the unit had been running flawlessly for quite some time.  Posts on other esp32 sites seem to imply it's the module.

Thank you!

[Tony Nicholson]

My IMSAI8080esp also developed this fault (SPI SRAM memory test fail) two weeks ago.  I tried to get a replacement PSRAM chip locally - but most stockists here in Australia are out of stock (ESP-PSRAM64H or Lyontek LY68L6400S).  I have an order in transit from DigiKey that’s due to arrive on Friday. I’ll post back here if the replacement fixes this.

Tony

[Tony Nicholson]

On Wednesday, June 2, 2021 at 8:04:11 PM UTC+10 Tony Nicholson wrote:

My IMSAI8080esp also developed this fault (SPI SRAM memory test fail) two weeks ago.  I tried to get a replacement PSRAM chip locally - but most stockists here in Australia are out of stock (ESP-PSRAM64H or Lyontek LY68L6400S).  I have an order in transit from DigiKey that’s due to arrive on Friday. I’ll post back here if the replacement fixes this.

Tony

I finally got around to replacing the Pseudo SRAM surface mount chip.

Everything is working now (no more SPI SRAM memory test errors).

The replacement part DigiKey shipped is an "Adafruit 64 Mbit Serial

Pseudo part #4677" and the DigiKey part number is 1528-4677-ND.

Tony