[U-Boot] ppc4xx/POST: Handle cached SDRAM correctly in Denali (440EPx) ECC POST

Submitted by Stefan Roese on Nov. 26, 2010, 2:45 p.m.

Details

Message ID 1290782722-9459-1-git-send-email-sr@denx.de
State Accepted
Commit 28e94bb2f7b796f58587752ab018b7d23fdc9061
Headers show

Commit Message

Stefan Roese Nov. 26, 2010, 2:45 p.m.
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(-)

Comments

Stefan Roese Nov. 28, 2010, 10:07 a.m.
On Friday 26 November 2010 15:45:22 Stefan Roese wrote:
> 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.

Applied to u-boot-ppc4xx/master. Thanks.
 
Cheers,
Stefan

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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;