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| author | Xie Xiaobo <r63061@freescale.com> | 2007-03-09 19:08:25 +0800 |
|---|---|---|
| committer | Kim Phillips <kim.phillips@freescale.com> | 2007-04-12 17:39:03 -0500 |
| commit | 6fbf261f8df294e589cfadebebe5468e3c0f29e9 (patch) | |
| tree | 592fb707b77e2a37a5259119149566192a7d7e49 | |
| parent | aea17f99278818caa327ad0e511b48d1761fb10c (diff) | |
| download | u-boot-imx-6fbf261f8df294e589cfadebebe5468e3c0f29e9.zip u-boot-imx-6fbf261f8df294e589cfadebebe5468e3c0f29e9.tar.gz u-boot-imx-6fbf261f8df294e589cfadebebe5468e3c0f29e9.tar.bz2 | |
Fix two bugs for MPC83xx DDR2 controller SPD Init
There are a few bugs in the cpu/mpc83xx/spd_sdram.c
the first bug is that the picos_to_clk routine introduces a huge
rounding error in 83xx.
the second bug is that the mode register write recovery field is
tWR-1, not tWR >> 1.
| -rw-r--r-- | cpu/mpc83xx/spd_sdram.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/cpu/mpc83xx/spd_sdram.c b/cpu/mpc83xx/spd_sdram.c index d9b8753..41a1f1f 100644 --- a/cpu/mpc83xx/spd_sdram.c +++ b/cpu/mpc83xx/spd_sdram.c @@ -58,8 +58,8 @@ picos_to_clk(int picos) int clks; ddr_bus_clk = gd->ddr_clk >> 1; - clks = picos / ((1000000000 / ddr_bus_clk) * 1000); - if (picos % ((1000000000 / ddr_bus_clk) * 1000) != 0) + clks = picos / (1000000000 / (ddr_bus_clk / 1000)); + if (picos % (1000000000 / (ddr_bus_clk / 1000)) != 0) clks++; return clks; @@ -624,7 +624,7 @@ long int spd_sdram() | (1 << (16 + 10)) /* DQS Differential disable */ | (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */ | (mode_odt_enable << 16) /* ODT Enable in EMRS1 */ - | ((twr_clk >> 1) << 9) /* Write Recovery Autopre */ + | ((twr_clk - 1) << 9) /* Write Recovery Autopre */ | (caslat << 4) /* caslat */ | (burstlen << 0) /* Burst length */ ); |