lib: sbi: Fix PMP CSR detection

HiFive unleashed currently implements fewer than 56 bits of physical
address so existing PMP CSR detection is broken.

PMP address register encodes bits 55-2 of a 56-bit physical address,
Not all physical address bits may be implemented, So just check
minimum 1 bit.

Fixes: 74d1db706293 ("lib: sbi: Improve PMP CSR detection and
progamming")

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index 4cbe8ce..6413194 100644 (file)
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -403,7 +403,7 @@ static void hart_detect_features(struct sbi_scratch *scratch)
        __check_csr_32(__csr + 32, __rdonly, __wrval, __field, __skip)
 
        /* Detect number of PMP regions */
-       __check_csr_64(CSR_PMPADDR0, 0, PMP_ADDR_MASK, pmp_count, __pmp_skip);
+       __check_csr_64(CSR_PMPADDR0, 0, 1UL, pmp_count, __pmp_skip);
 __pmp_skip:
 
        /* Detect number of MHPM counters */