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Change the replacement stratege of cache

xiaochang yu
Note: This was originally posted on 6th August 2010 at http://forums.arm.com

Hi,all.
For the design of system, I want to change the repalcement stratege of cache from random replacement to predictable replacement. So I need to change the bit[14] in control register(c1) of cp15 from 0 to 1. But the property of this bit is secure modify only. Could tell me how could I modify it? The arm system  i used is arm11 with wince6.0.
Thanks.
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  • Arm Employee Badge
    Note: This was originally posted on 9th August 2010 at http://forums.arm.com

    Which ARM11 are you using?  Only the ARM1176JFZ-S supports TrustZone, and has the Secure access only restriction.

    Assuming it is an 1176...  Unless the design is actively using TrustZone, it is probably running in the Secure world already.  You will also need to be in a privileged mode - which means its under the control of the OS.  So the question becomes what system calls does WinCE 6.0 provide to let you manipulate it.
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  • Arm Employee Badge
    Note: This was originally posted on 9th August 2010 at http://forums.arm.com

    Which ARM11 are you using?  Only the ARM1176JFZ-S supports TrustZone, and has the Secure access only restriction.

    Assuming it is an 1176...  Unless the design is actively using TrustZone, it is probably running in the Secure world already.  You will also need to be in a privileged mode - which means its under the control of the OS.  So the question becomes what system calls does WinCE 6.0 provide to let you manipulate it.
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