With a 64-bit wide data bus only the lowest 8-bits of the ECC syndrome are relevant. With a 32-bit wide data bus only the lowest 16-bits are relevant on most architectures.
Without this change, the ECC syndrome displayed can be mildly confusing, eg: EDAC MPC85xx MC1: syndrome: 0x25252525 When in reality the ECC syndrome is 0x25. Signed-off-by: Peter Tyser <pty...@xes-inc.com> --- A variety of Freescale manual's say a variety of different things about how to decode the CAPTURE_ECC (syndrome) register. I don't have a system with a 32-bit bus to test on, but I believe the change is correct. It'd be good to get an ACK from someone at Freescale about this change though. drivers/edac/mpc85xx_edac.c | 12 +++++++++++- drivers/edac/mpc85xx_edac.h | 3 +++ 2 files changed, 14 insertions(+), 1 deletions(-) diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c index ecd5928..6d0114a 100644 --- a/drivers/edac/mpc85xx_edac.c +++ b/drivers/edac/mpc85xx_edac.c @@ -672,6 +672,7 @@ static void mpc85xx_mc_check(struct mem_ctl_info *mci) { struct mpc85xx_mc_pdata *pdata = mci->pvt_info; struct csrow_info *csrow; + u32 bus_width; u32 err_detect; u32 syndrome; u32 err_addr; @@ -692,6 +693,15 @@ static void mpc85xx_mc_check(struct mem_ctl_info *mci) } syndrome = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ECC); + + /* Mask off appropriate bits of syndrome based on bus width */ + bus_width = (in_be32(pdata->mc_vbase + MPC85XX_MC_DDR_SDRAM_CFG) & + DSC_DBW_MASK) ? 32 : 64; + if (bus_width == 64) + syndrome &= 0xff; + else + syndrome &= 0xffff; + err_addr = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ADDRESS); pfn = err_addr >> PAGE_SHIFT; @@ -707,7 +717,7 @@ static void mpc85xx_mc_check(struct mem_ctl_info *mci) mpc85xx_mc_printk(mci, KERN_ERR, "Capture Data Low: %#8.8x\n", in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_DATA_LO)); - mpc85xx_mc_printk(mci, KERN_ERR, "syndrome: %#8.8x\n", syndrome); + mpc85xx_mc_printk(mci, KERN_ERR, "syndrome: %#2.2x\n", syndrome); mpc85xx_mc_printk(mci, KERN_ERR, "err addr: %#8.8x\n", err_addr); mpc85xx_mc_printk(mci, KERN_ERR, "PFN: %#8.8x\n", pfn); diff --git a/drivers/edac/mpc85xx_edac.h b/drivers/edac/mpc85xx_edac.h index 52432ee..cb24df8 100644 --- a/drivers/edac/mpc85xx_edac.h +++ b/drivers/edac/mpc85xx_edac.h @@ -48,6 +48,9 @@ #define DSC_MEM_EN 0x80000000 #define DSC_ECC_EN 0x20000000 #define DSC_RD_EN 0x10000000 +#define DSC_DBW_MASK 0x00180000 +#define DSC_DBW_32 0x00080000 +#define DSC_DBW_64 0x00000000 #define DSC_SDTYPE_MASK 0x07000000 -- 1.6.2.1 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev