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[libcpu/arm/cortex-a] Revert safety MMU initialization. (#6796) 

* Revert safety MMU initialization.

Co-authored-by: Wayne Lin <wclin@nuvoton.com>
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Wayne 2023-03-31 10:06:28 +08:00 committed by GitHub
parent 3c2169e637
commit 3309ef6001
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1 changed files with 8 additions and 1 deletions
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9
libcpu/arm/cortex-a/start_gcc.S
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@ -147,7 +147,14 @@ after_enable_mmu:
/* disable the data alignment check */
mrc p15, 0, r1, c1, c0, 0
bic r1, #(1<<1)
bic r1, #(1<<1) /* Disable Alignment fault checking */
#ifndef RT_USING_SMART
bic r1, #(1<<0) /* Disable MMU */
bic r1, #(1<<2) /* Disable data cache */
bic r1, #(1<<11) /* Disable program flow prediction */
bic r1, #(1<<12) /* Disable instruction cache */
bic r1, #(3<<19) /* bit[20:19] must be zero */
#endif /* RT_USING_SMART */
mcr p15, 0, r1, c1, c0, 0
/* enable I cache + branch prediction */