topic Re: IMX6S OCRAM access in i.MX Processors

IMX6S OCRAM access

fabricealcindor — Mon, 17 Mar 2014 11:00:30 GMT

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

Re: IMX6S OCRAM access

AnsonHuang — Tue, 18 Mar 2014 04:59:22 GMT

Hi, Fabrice

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

Re: IMX6S OCRAM access

fabricealcindor — Tue, 18 Mar 2014 08:24:28 GMT

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

*(0x00900000)=0.

Re: IMX6S OCRAM access

AnsonHuang — Tue, 18 Mar 2014 09:28:15 GMT

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.

Re: IMX6S OCRAM access

fabricealcindor — Tue, 18 Mar 2014 09:35:33 GMT

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

Re: IMX6S OCRAM access

AnsonHuang — Tue, 18 Mar 2014 09:39:48 GMT

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

Re: IMX6S OCRAM access

fabricealcindor — Tue, 18 Mar 2014 09:42:11 GMT

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

Thanks

Re: IMX6S OCRAM access

YixingKong — Mon, 16 Jun 2014 07:57:55 GMT

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

Re: IMX6S OCRAM access

YixingKong — Tue, 24 Jun 2014 08:55:43 GMT

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

Re: IMX6S OCRAM access

YixingKong — Tue, 08 Jul 2014 06:35:47 GMT

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