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Unable to access I.MX6ULL memory map registers using devmem2 - fsl-yocto-L4.9.11_1.0.0.tar

Question asked by Sri Shan on May 19, 2018
Latest reply on Jun 5, 2018 by ANKIT PATEL

Dear I.MX Community


Am trying to verify I2C2 Controller module registers in linux using devmem2, I have hereby attached my devmem2.c file 


root@imx6ull14x14evk:/# devmem2 0x21A0000 
/dev/mem opened. 
Error at line 86, file devmem2.c (1) [Operation not permitted] 


whereas, I was able to access other register using devmem for example as shown below 


root@imx6ull14x14evk:/# devmem2 0x21EC08C w 0x00008200 
/dev/mem opened. 
Memory mapped at address 0x76f80000. 
Value at address 0x21EC08C (0x76f8008c): 0x8000 
Written 0x8200; readback 0x8000 


Could you please let me know how this i2c memory map registers can be accessed using devmem2? 


Requesting you to let me know if there any issues in the attached devmem2.c file or share me the working devmem2 file in your test setup 


Kindly do the needful as early as possible, as I stuck in this issue from past 2 weeks 
Eagerly awaiting for your replies 
Many Thanks in adavnce