diff options
Diffstat (limited to 'src/northbridge/intel')
| -rw-r--r-- | src/northbridge/intel/ironlake/raminit.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/northbridge/intel/ironlake/raminit.c b/src/northbridge/intel/ironlake/raminit.c index ecf8ef8576..beb22445fe 100644 --- a/src/northbridge/intel/ironlake/raminit.c +++ b/src/northbridge/intel/ironlake/raminit.c @@ -101,6 +101,15 @@ static void read128(u32 addr, u64 * out) out[1] = ret.hi; } +/* + * Ironlake memory I/O timings are located in scan chains, accessible + * through MCHBAR register groups. Each channel has a scan chain, and + * there's a global scan chain too. Each chain is broken into smaller + * sections of N bits, where N <= 32. Each section allows reading and + * writing a certain parameter. Each section contains N - 2 data bits + * and two additional bits: a Mask bit, and a Halt bit. + */ + /* OK */ static void write_1d0(u32 val, u16 addr, int bits, int flag) { |