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System hang when using devmem2 to read GPMI registers

Question asked by abutter gao on Nov 20, 2018
Latest reply on Nov 21, 2018 by abutter gao

When running devmem2 0x01806000 w to check GPMI registers, the system seemed hang, there is no response when I input something on serial console.

I tried other register, devmem2 works and I could read 0x01806000 in u-boot using md command:


root@imx6ul-var-dart:~# devmem2 0x020c4068 w
/dev/mem opened.
Memory mapped at address 0x76f5e000.
Read at address  0x020C4068 (0x76f5e068): 0xC0C00F0F
root@imx6ul-var-dart:~# devmem2 0x01806000 w
/dev/mem opened.


I suspect if the clock for GPMI is disabled, but before reading the GPMI register, I run nandtest command, no crash or hang was seen.

Any suggestion is appreciated.