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ARM1176 boot code issue

sathishpkumar sathishpkumar
Note: This was originally posted on 5th June 2009 at http://forums.arm.com

Hi
I got an issue while writing the ARM1176 bootcode.

I used DCI 0xE1600071 instruction to switch from secure priviliged mode to monitor mode.
After ARM executed this instruction , tarmac.log file is not updated i.e., ARM is not switching to monitor mode but r14_mon and spsr_mon is updated

please let me know what could be the issue


Thanks,
Sathish
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  • Arm Employee Badge
    Note: This was originally posted on 5th June 2009 at http://forums.arm.com

    Have you programmed up the monitor mode vector table, stack register, etc before executing the SMC?

    If you haven't reprogrammed the monitor vector base address then you may just be jumping to faulting memory - which causes the core to fault and jump to the monitor mode vector address - i.e. infinite loop.

    The Secure World can modify CPSR directly to switch in to monitor mode to perform this initial setup.
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  • Arm Employee Badge
    Note: This was originally posted on 5th June 2009 at http://forums.arm.com

    Have you programmed up the monitor mode vector table, stack register, etc before executing the SMC?

    If you haven't reprogrammed the monitor vector base address then you may just be jumping to faulting memory - which causes the core to fault and jump to the monitor mode vector address - i.e. infinite loop.

    The Secure World can modify CPSR directly to switch in to monitor mode to perform this initial setup.
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