Use icache to speed up bootloader startup

Source: Internet
Author: User

 

Add the following commands

/* Start icache */
MRC P15, 0, R0, C1, C0, 0 // read control Reg
ORR r0, R0, #(1 <12)
MCR P15, 0, R0, C1, C0, 0 // write it back

1. The MRC command transfers the value in the coprocessor register to the ARM Processor register. If the coprocessor fails to perform this operation, an undefined command exception is interrupted.

2. Orr performs logic or operations.

3. The MCR command transfers data from the ARM processor registers to the coprocessor registers. If the coprocessor fails to perform this operation, an undefined command exception is interrupted.

Use icache to speed up bootloader startup

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