Behavior of i.mx6 when network device connected by pcie reboots

[heecheol_jung]

I connect i.mx6 and network device (ex> QCT mdm chipset) by PCIe interface.

When the connected network device is rebooted, i.MX6 hangs.

The adb device can not be detected through the 'adb devices' command, and the uart console does not work either.

I think it need to reboot by kernel panic or watchdog, how do I set it?

[igorpadykov]

Hi y heecheol

one can try to use wdog for rebooting, for wdog connection please check

i.MX6Q Sabre SD schematic

Schematics (1)
Design files, including hardware schematics, Gerbers, and OrCAD files.
SABRE Platform for Smart Devices|NXP 

Wdog driver is described in Linux Manual included in linux documentation found on

i.MX Software|NXP 

Best regards
igor
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[heecheol_jung]

Dear Igor

sorry for late response.

The hang problem was solved by kernel panic via modem-monitor. (+modify kernel config)

I have additional question about scenario when rebooting with pcie connected.

(Network device < (PCIe) > i.MX6)

In the above state,  is each of the reboot scenarios with modem-monitor shown below?

1. Network device reboot

> Network device reboot

> Detect PCIe disconnect in i.MX6

> i.MX6 also reboots at the same time to re-connect to PCIe

> As a result, Network device and i.MX6 reboot once

2. i.MX6 reboot

> i.MX6 reboot

> Detect PCIe disconnect in i.MX6 after reboot

> i.MX6 and Network device are reboot

> As a result, Network device reboot once and i.MX6 reboot twice

Thanks & regards

heecheol.jung