topic Re: Not able to access CAAM registers from kernel in i.MX Processors

Not able to access CAAM registers from kernel

rohininarasipur — Tue, 01 Dec 2015 15:33:25 GMT

Hello,

I am trying to write CAAM driver for vxworks. I want to initialize Job Ring registers in order to send commands to caam but I am not able to access any of them after boot. Only at the boot time I am able to write to them or read from them. The security manual says I can access them only when using MID specified in JRxMIDR register. I did set MID in JRxMIDR at the boot time. Where else do we have to set MID? I don't understand what else I have to do in order to be able to access Job Ring registers after boot. Please tell me where I am going wrong. Any type of lead or help is appreciated. Thanks!!

Re: Not able to access CAAM registers from kernel

Yuri — Wed, 02 Dec 2015 05:15:56 GMT

Hello,

The problem may take place because the clock for the CAAM isn't enabled by default.

Have a great day,
Yuri

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Re: Not able to access CAAM registers from kernel

rohininarasipur — Wed, 02 Dec 2015 15:33:48 GMT

I tried enabling clock. It isn't working. I haven't enabled secure boot. Is that the reason?

Re: Not able to access CAAM registers from kernel

Yuri — Fri, 04 Dec 2015 06:08:55 GMT

You may refer to an example from the i.MX6 Platform SDK

Regards,

Yuri.