IMX6S OCRAM access

[fabricealcindor]

Hi,

In the thread of VPU driver implementation I need to use internal RAM. On the linux driver OCRAM is used for this purpose.

What are the pre-requisite to use this memory. I actually fail trying to access this memory. I tried some clocks setup without any success.

Regards,

Fabrice

[AnsonHuang]

Hi, Fabrice

     Can you tell me which memory space you tried to access, and how you accessed it?

[fabricealcindor]

Hi

I try to access the internal RAM of  IMX6 solo so called  OCRAM at address 0x00900000 by simple C instruction like

*(0x00900000)=0.

[AnsonHuang]

Have you considered the MMU enabled case, where did you put this code? In kernel? If it is in kernel, then the physical address can NOT be accessed directly.

[fabricealcindor]

I tried in a linux user-space application and a vxworks task. in last case MMU is not enabled.

[AnsonHuang]

Then I can NOT understand why, the only possibility is that MMU is enabled, can you try it in uboot with md command?

[fabricealcindor]

indeed I can access to this memory during uboot. So MMU might be enabled. I'll check that.

Thanks

[YixingKong]

Fabrice

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

[YixingKong]

Fabrice

We have not got your response yet and will close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing

[YixingKong]

Fabrice

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing