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Tool/software: Code Composer Studio
Hi,
Can anyone please help me in understanding the assembly code in the MPU for a particular region.
How configuring the cache type in the HALCOGEN for the MPU Region's generate the code for writing the System Configuration Register?
what exactly the instruction "mcr p15, #0, r0, c6, c1, #4" does? by writing this which register's field are getting updated?
Regards,
Shivam Kakad
Hello Shivam,
The MRC and MCR commands are used to send commands to coprocessors. MRC is used to read coprocessor (CP15 etc) registers and put it into main core registers (R0, R1, ...). MCR is to move the value from ARM core registers to Coproecssor register.
mcr p15, #0, r0, c6, c1, #4 is to read MPU region access control register
p15: co-processor CP15
#0: CP15 specific opcode1
r0: arm core register, you can use any arm register here (r0,r1, ...). This register is updated with the returned value from coprocessor registers.
c6, c1: MPU memory region programming registers. MPU Region Number Register
#4: co-processor opcode2
Please refer to ARM TRM.
