lib: sbi: clear pmpcfg.A before setting in pmp_set()

We should clear A bits in prot variable before enabling A_NA4 or A_NAPOT.

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

diff --git a/lib/sbi/riscv_asm.c b/lib/sbi/riscv_asm.c
index 25b40cf..1642ac6 100644 (file)
--- a/lib/sbi/riscv_asm.c
+++ b/lib/sbi/riscv_asm.c
@@ -268,6 +268,7 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
                return SBI_ENOTSUPP;
 
        /* encode PMP config */
+       prot &= ~PMP_A;
        prot |= (log2len == PMP_SHIFT) ? PMP_A_NA4 : PMP_A_NAPOT;
        cfgmask = ~(0xffUL << pmpcfg_shift);
        pmpcfg  = (csr_read_num(pmpcfg_csr) & cfgmask);