i.MX Processorsのトピックi.MX6ULL CPU Overheating and System Reboot Issue

i.MX6ULL CPU Overheating and System Reboot Issue

mythfish — Mon, 19 Aug 2024 05:52:48 GMT

We have observed that when the CPU core temperature reaches 100℃, our Linux-based system initiates a shutdown sequence followed by an automatic reboot. This results in a repetitive reboot cycle which is highly undesirable for our application.

Could you please provide any guidance or solutions to address this issue? Specifically, we would like to know if there are any recommended configurations or patches that can prevent the system from rebooting under these thermal conditions.

Re: i.MX6ULL CPU Overheating and System Reboot Issue

joanxie — Wed, 21 Aug 2024 02:07:32 GMT

what BSP version do you use? I need check how your kernel settings is

Re: i.MX6ULL CPU Overheating and System Reboot Issue

mythfish — Wed, 21 Aug 2024 03:42:04 GMT

Below is the temp grade setting code. @joanxie

static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) { struct imx_thermal_data *data = platform_get_drvdata(pdev); /* The maximum die temp is specified by the Temperature Grade */ switch ((ocotp_mem0 >> 6) & 0x3) { case 0: /* Commercial (0 to 95 °C) */ data->temp_grade = "Commercial"; data->temp_max = 95000; break; case 1: /* Extended Commercial (-20 °C to 105 °C) */ data->temp_grade = "Extended Commercial"; data->temp_max = 105000; break; case 2: /* Industrial (-40 °C to 105 °C) */ data->temp_grade = "Industrial"; data->temp_max = 105000; break; case 3: /* Automotive (-40 °C to 125 °C) */ data->temp_grade = "Automotive"; data->temp_max = 125000; break; } /* * Set the critical trip point at 5 °C under max * Set the passive trip point at 10 °C under max (changeable via sysfs) */ data->temp_critical = data->temp_max - (1000 * 5); data->temp_passive = data->temp_max - (1000 * 10); }

Re: i.MX6ULL CPU Overheating and System Reboot Issue

joanxie — Tue, 27 Aug 2024 01:01:12 GMT

since you find the driver, you can change the max temperature for avoiding the rebooting, but I don't suggest you to do this, if you set higher temperature as data sheet mentions, maybe the higher temperature would destroy your board