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i.MX6 SysRq : Emergency Remount R/O

Question asked by Michael Schrag on Jul 13, 2015
Latest reply on Mar 30, 2016 by zhang huan

Good Morning,

 

I am working with the Freescale i.MX6 Dual Light SD processor, and have been having issues with the boot process. I have solved issues with removed components by modifying the kernel of our Android KitKat 4.4.2 OS. I have had to remove the following drivers: PCIe, V4L (removed to alleviate error messages), MAX11801, and Watchdog. The issue I am running into is that the boot seems to process correctly until the final few lines, where an emergency remount occurs and the CPUs shut down after about 8s. Furthermore, when I use it on a prototype board provided by Freescale, the boot processes perfectly fine. Here is the final lines of the boot process:

 

mma enable setting active
eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:01, irq=-1)

ADDRCONF(NETDEV_UP): eth0: link is not ready

acc_open

acc_release

ehci_fsl_bus_resume begins, Host 1

ehci_fsl_bus_resume ends, Host 1

ehci_fsl_bus_resume begins, DR

mtp_open

init: sys_prop: permission denied uid:1003 name:service.bootanim.exit

ehci_fsl_bus_suspend begins, Host 1

ehci_fsl_bus_suspend ends, Host 1

SysRq : Emergency Remount R/O

EXT4-fs (mmcblk0p4): re-mounted. Opts: (null)

EXT4-fs (mmcblk0p6): re-mounted. Opts: (null)

Emergency Remount complete

imx2-wdt imx2-wdt.0: Device shutdown: Expect reboot!

Disabling non-boot CPUs ...

 

I have seen some suggestions that this may be due to the Watchdog Timer, but that has been disabled so that should not be the problem. Does anyone have any ideas on what could be causing my errors?

 

Thanks for your help.

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