How can I check if R5F is running in lock-step or split mode? Is there some register I can look at?
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The c15, Build Options 2 register can be used to check this.
To view this register we can use CP15 registers from System Registers.
Registers -> System_Registers -> CP15_BUILD_OPTIONS_2 register. The bit 30 (LOCK_STEP) here denotes if the R5F is in Lock-step or split mode.
0 :: Split mode
1 :: Lock step mode