On 08/16/2013 03:57 AM, Dai Yan wrote:

sorry about that I didn't express explicity. what I wrote is cp15 c15 regsiter . And I found that it cannont be written on my adndale board .

Those would be implementation defined registers which I don't have much experience with. My only suggestions would be to check for hypervisor traps and read and re-read the chip-specific and architecture documentation.

Christopher

2013/8/16 Dai Yan <kanshuzhi@gmail.com mailto:kanshuzhi@gmail.com>

Could someone help me with that? 
Previously i always do writing the register from kernel modules but always
failed.



2013/8/16 Dai Yan <kanshuzhi@gmail.com <mailto:kanshuzhi@gmail.com>>

     it seems that the all of cp15 registers cannot be written,
    I try write it from kernel space(module).

    Best Regards


    2013/8/15 Christopher Covington <cov@codeaurora.org
    <mailto:cov@codeaurora.org>>

        Hi Dai,

        On 08/15/2013 08:15 AM, Dai Yan wrote:
        > Hello,
        >
        > Maybe it's a stupid question.
        >
        > I want to modify cp15 register.

        Which register?

        > but I found that the register cannont be written,it can ony be read.

        Is this from user space or kernel space?

        > Could someone help me with that?
        >
        > distribute version: ubnuntu linaro 13.07 arndale board
        >
        > kernel:3.10.2+

        Christopher