topic i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled in i.MX Processors

i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled

Niebel-TQ — Thu, 13 Jun 2024 09:14:59 GMT

When using SCFW (based on 1.15 version of porting kit) compiled for our board with DEBUG and MONITOR enabled we saw random program crashes especially when using applications related to VPU or GPU.

When trying to isolate the problem we used a testing setup using glmark2-es-wayland and memtester.

We could reproduce this on several systems with 4 GB of RAM using:

```
glmark2-es-wayland --run-forever &
memtester 3G 100
```

After a while memtester spits out errors without a reproducible pattern. This happens with / without cooling. The same boards runs for hours with the same SCFW compiled without DEBUG.

@danny_john

Re: i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled

Bio_TICFSL — Fri, 14 Jun 2024 14:35:23 GMT

Hello,

Yes we saw this behavior in previous BSP, so please tell us which version of BSP are you using? This is a custom board or EVK? in order to reproduced please send us your code test to check it

Thanks

Re: i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled

Niebel-TQ — Mon, 17 Jun 2024 09:58:05 GMT

- SCU based on 1.15 - other parts of BSP:

linux-imx based on 5.10,
atf-imx based 2.2
yocto hardknott (meta-freescale + meta-tq)

Software runs on TQMa8QM SOM mounted on a custom Mainboard

Re: i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled

Niebel-TQ — Mon, 17 Jun 2024 10:07:15 GMT

on SOM with 4GB RAM to reproduce
(needs up to 30 minutes)
```
glmark2-es2-wayland --run-forever &
memtester 3G 100
```
or (triggered after some minutes)
```
glmark2-es2-wayland --run-forever &
stressapptest -M 2500 -s 3000 -C 4 -i 4 -m 4
```

CPU governernor: ondemand, SCU receives lots of requests to scale voltages for booth Cortex-A Clusters

Re: i.MX8: random DRAM problems when using SCFW compiled with DEBUG and MONITOR enabled

Bio_TICFSL — Mon, 17 Jun 2024 14:55:00 GMT

Hello,

You need at least 6.6.3 BSP please download. BTW we are not able to see the issue with 5.15 BSP the EVK is running for an hour, maybe you need to check with your vendor.

Regards