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The ARM926EJ-S Technical Reference Manual states: > You can only access CP15 registers with MRC and MCR instructions in a > privileged mode. CDP, LDC, STC, MCRR, and MRRC instructions, and unprivileged > MRC or MCR instructions to CP15 cause the Undefined instruction exception to > be taken. Furthermore, `MCR p15, 0, <Rd>, c7, c10, 5` (later called Data Memory Barrier) is not specified for the ARM926. Thus, SDL should not use these cache instructions on ARMv5. (cherry picked from commit 139a093)
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