ppc4xx/POST: Handle cached SDRAM correctly in Denali (440EPx) ECC POST
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>
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 @@
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 @@
/* 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 @@
/* 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 @@
/* Remove error from SDRAM and enable ECC. */
out_be32(ecc_mem, ECC_PATTERN);
+ ppcDcbf((u32)ecc_mem);
clear_and_enable_ecc();
return ret;