When 4 chip-selects are used, vref should use range 1 and CDT uses 80 ohm, and 2T timing is enabled.
Signed-off-by: York Sun yorksun@freescale.com
---
board/freescale/ls2085ardb/ddr.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/board/freescale/ls2085ardb/ddr.c b/board/freescale/ls2085ardb/ddr.c index 8d71ae1..e1d6aa1 100644 --- a/board/freescale/ls2085ardb/ddr.c +++ b/board/freescale/ls2085ardb/ddr.c @@ -131,10 +131,18 @@ found: popts->zq_en = 1;
if (ddr_freq < 2350) { - popts->ddr_cdr1 = DDR_CDR1_DHC_EN | - DDR_CDR1_ODT(DDR_CDR_ODT_60ohm); - popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) | - DDR_CDR2_VREF_RANGE_2; + if (pdimm[0].n_ranks == 2 && pdimm[1].n_ranks == 2) { + /* four chip-selects */ + popts->ddr_cdr1 = DDR_CDR1_DHC_EN | + DDR_CDR1_ODT(DDR_CDR_ODT_80ohm); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_80ohm); + popts->twot_en = 1; /* enable 2T timing */ + } else { + popts->ddr_cdr1 = DDR_CDR1_DHC_EN | + DDR_CDR1_ODT(DDR_CDR_ODT_60ohm); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_60ohm) | + DDR_CDR2_VREF_RANGE_2; + } } else { popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_100ohm);