diff options
| author | Alex Mauer <hawke@hawkesnest.net> | 2007-05-10 19:02:19 +0000 |
|---|---|---|
| committer | Stefan Reinauer <stepan@openbios.org> | 2007-05-10 19:02:19 +0000 |
| commit | f05e85b390244e596dd0fc73bb774607b0c1ff9a (patch) | |
| tree | 3428c44d9b8b66dcd91e7e51f3f7de4d9f242ad5 | |
| parent | 1346a27dee50e200b6e36bf378aa8ed10457b8f2 (diff) | |
The attached patch sets the MA map type correctly for all DIMMs I was
able to find to test with the Epia.
Signed-off-by: Alex Mauer <hawke@hawkesnest.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2653 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
| -rw-r--r-- | src/northbridge/via/vt8601/raminit.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/src/northbridge/via/vt8601/raminit.c b/src/northbridge/via/vt8601/raminit.c index 1aa58224f7..b16d0be3c7 100644 --- a/src/northbridge/via/vt8601/raminit.c +++ b/src/northbridge/via/vt8601/raminit.c @@ -377,18 +377,22 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl) if (!size) continue; - /* Calculate the value of MA mapping type register, - * based on size of SDRAM chips. */ - size = (size & 0xffff) << (3 + 3); - /* convert module size to be in Mbits */ - size /= spd_num_chips(slot); - print_debug_hex16(size); - print_debug(" is the chip size\r\n"); - if (size < 64) - ma = 0; - else if (size < 256) - ma = 8; - else + /* Read the row densities */ + size = smbus_read_byte(0x50+slot, 0x1f); + + /* Set the MA map type. + * + * 0xa should be another option, but when + * it would be used is unknown. + */ + + if (size < 16 ) /* less than 64 MB per side */ + ma = 0x0; + else if (size < 32) /* less than 128MB per side */ + ma = 0x8; + else if ( size < 64) /* less than 256MB per side */ + ma = 0xc; + else /* 256MB or more per side */ ma = 0xe; print_debug_hex16(ma); print_debug(" is the MA type\r\n"); |