This patch fixes a problem in the Denali (440EPx) SDRAM ECC POST test. When cache is enabled in the SDRAM area, the values written to SDRAM need to be flushed from cache to SDRAM using the dcfb instruction.
Without this patch the POST ECC test failed. Now its working again on platforms with cache enabled in SDRAM.
Signed-off-by: Stefan Roese sr@denx.de --- post/cpu/ppc4xx/denali_ecc.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/post/cpu/ppc4xx/denali_ecc.c b/post/cpu/ppc4xx/denali_ecc.c index 50ae7fb..6d14635 100644 --- a/post/cpu/ppc4xx/denali_ecc.c +++ b/post/cpu/ppc4xx/denali_ecc.c @@ -174,6 +174,7 @@ static int test_ecc(uint32_t ecc_addr) clear_and_enable_ecc(); out_be32(ecc_mem, ECC_PATTERN); out_be32(ecc_mem + 1, ECC_PATTERN); + ppcDcbf((u32)ecc_mem);
/* Verify no ECC error reading back */ value = in_be32(ecc_mem); @@ -193,6 +194,7 @@ static int test_ecc(uint32_t ecc_addr)
/* Test for correctable error by creating a one-bit error */ out_be32(ecc_mem, ECC_PATTERN_CORR); + ppcDcbf((u32)ecc_mem); clear_and_enable_ecc(); value = in_be32(ecc_mem); disable_ecc(); @@ -212,6 +214,7 @@ static int test_ecc(uint32_t ecc_addr)
/* Test for uncorrectable error by creating a two-bit error */ out_be32(ecc_mem, ECC_PATTERN_UNCORR); + ppcDcbf((u32)ecc_mem); clear_and_enable_ecc(); value = in_be32(ecc_mem); disable_ecc(); @@ -232,6 +235,7 @@ static int test_ecc(uint32_t ecc_addr)
/* Remove error from SDRAM and enable ECC. */ out_be32(ecc_mem, ECC_PATTERN); + ppcDcbf((u32)ecc_mem); clear_and_enable_ecc();
return ret;