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lib: sbi: Fix PMP CSR detection

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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: 74d1db7062 ("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>
This commit is contained in:
Pragnesh Patel
2020-09-23 12:44:17 +05:30
committed by Anup Patel
parent aaeca7eb4e
commit 7701ea13be
1 changed files with 1 additions and 1 deletions
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lib/sbi/sbi_hart.c
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@@ -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 */