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authorRonald G. Minnich <rminnich@gmail.com>2006-04-18 21:21:10 +0000
committerRonald G. Minnich <rminnich@gmail.com>2006-04-18 21:21:10 +0000
commit55e10fe3a4e84ef19ad718345808b6c354893ff1 (patch)
treea8f9059e52c2ffae028633ce6bf5dfc6bc220bad
parent170ce333ca2d18df9ad1237dc9ac14e5ce235266 (diff)
set up timing
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2257 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
-rw-r--r--src/mainboard/olpc/rev_a/auto.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/src/mainboard/olpc/rev_a/auto.c b/src/mainboard/olpc/rev_a/auto.c
index 4775b8c9fe..ea86d34497 100644
--- a/src/mainboard/olpc/rev_a/auto.c
+++ b/src/mainboard/olpc/rev_a/auto.c
@@ -48,11 +48,11 @@ static inline unsigned int fls(unsigned int x)
d0_MB=1 (module banks)
d0_cb=4 (component banks)
do_psz=4KB (page size)
- Trc=10 (clocks)
- Tras=7
- Trcd=3
- Trp=3
- Trrd=2
+ Trc=10 (clocks) (ref2act)
+ Tras=7 (act2pre)
+ Trcd=3 (act2cmd)
+ Trp=3 (pre2act)
+ Trrd=2 (act2act)
Tref=17.8ms
*/
static void sdram_set_spd_registers(const struct mem_controller *ctrl)
@@ -78,17 +78,15 @@ static void sdram_set_spd_registers(const struct mem_controller *ctrl)
val >>= 2;
msr.hi &= ~(0x1 << CF07_UPPER_D0_CB_SHIFT);
msr.hi |= (val << CF07_UPPER_D0_CB_SHIFT);
-HERE
+
/* get the module bank density, SPD byte 31 */
- val = spd_read_byte(0xA0, 31);
- val = fls(val);
- val <<= module_banks;
+ /* this is multiples of 8 MB */
+ val = 128 / 8;
msr.hi &= ~(0xf << CF07_UPPER_D0_SZ_SHIFT);
msr.hi |= (val << CF07_UPPER_D0_SZ_SHIFT);
/* page size = 2^col address */
- val = spd_read_byte(0xA0, 4);
- val -= 7;
+ val = 2; /* 4096 bytes */
msr.hi &= ~(0x7 << CF07_UPPER_D0_PSZ_SHIFT);
msr.hi |= (val << CF07_UPPER_D0_PSZ_SHIFT);
@@ -99,9 +97,23 @@ HERE
msr.lo = 0x00003000;
wrmsr(MC_CF07_DATA, msr);
+ /* timing and mode ... */
+
msr = rdmsr(0x20000019);
- msr.hi = 0x18000108;
- msr.lo = 0x696332a3;
+
+ /* per standard bios settings */
+
+ msr.lo =
+ (6<<28) | // cas_lat
+ (10<<24)| // ref2act
+ (7<<20)| // act2pre
+ (3<<16)| // pre2act
+ (3<<12)| // act2cmd
+ (2<<8)| // act2act
+ (2<<6)| // dplwr
+ (2<<4)| // dplrd
+ (3); // dal
+
wrmsr(0x20000019, msr);
}