From a2c95a72247990dee9a03b26b4dc9fc0182c97ed Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Fri, 28 Jul 2006 18:34:58 +0200 Subject: PPC440 DDR setup: Set SDRAM0_CFG0[PMU]=0 for best performance AMCC suggested to set the PMU bit to 0 for best performace on the PPC440 DDR controller. Please see doc/README.440-DDR-performance for details. Patch by Stefan Roese, 28 Jul 2006 --- board/amcc/yellowstone/yellowstone.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'board/amcc/yellowstone') diff --git a/board/amcc/yellowstone/yellowstone.c b/board/amcc/yellowstone/yellowstone.c index 86d0db7..92dc9d4 100644 --- a/board/amcc/yellowstone/yellowstone.c +++ b/board/amcc/yellowstone/yellowstone.c @@ -313,13 +313,13 @@ void sdram_init(void) mtsdram(mem_tr0, 0x410a4012); /* ?? */ mtsdram(mem_rtr, 0x04080000); /* ?? */ mtsdram(mem_cfg1, 0x00000000); /* Self-refresh exit, disable PM */ - mtsdram(mem_cfg0, 0x34000000); /* Disable EEC */ + mtsdram(mem_cfg0, 0x30000000); /* Disable EEC */ udelay(400); /* Delay 200 usecs (min) */ /*-------------------------------------------------------------------- * Enable the controller, then wait for DCEN to complete *------------------------------------------------------------------*/ - mtsdram(mem_cfg0, 0x84000000); /* Enable */ + mtsdram(mem_cfg0, 0x80000000); /* Enable */ for (;;) { mfsdram(mem_mcsts, reg); -- cgit v1.1