Add fine-tuning for the DRAM configuration according to the DRAM chip datasheet. THis configuration applies to both Hynix HY5DU12622DTP and Samsung K5H511538J-D43 .
Signed-off-by: Marek Vasut marex@denx.de Cc: Stefano Babic sbabic@denx.de --- board/olimex/mx23_olinuxino/mx23_olinuxino.c | 30 ++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/board/olimex/mx23_olinuxino/mx23_olinuxino.c b/board/olimex/mx23_olinuxino/mx23_olinuxino.c index 65cbbf1..313ab20 100644 --- a/board/olimex/mx23_olinuxino/mx23_olinuxino.c +++ b/board/olimex/mx23_olinuxino/mx23_olinuxino.c @@ -78,3 +78,33 @@ int board_init(void)
return 0; } + +/* Fine-tune the DRAM configuration. */ +void mxs_adjust_memory_params(uint32_t *dram_vals) +{ + /* Enable Auto Precharge. */ + dram_vals[3] |= 1 << 8; + /* Enable Fast Writes. */ + dram_vals[5] |= 1 << 8; + /* tEMRS = 3*tCK */ + dram_vals[10] &= ~(0x3 << 8); + dram_vals[10] |= (0x3 << 8); + /* CASLAT = 3*tCK */ + dram_vals[11] &= ~(0x3 << 0); + dram_vals[11] |= (0x3 << 0); + /* tCKE = 1*tCK */ + dram_vals[12] &= ~(0x7 << 0); + dram_vals[12] |= (0x1 << 0); + /* CASLAT_LIN_GATE = 3*tCK , CASLAT_LIN = 3*tCK, tWTR=2*tCK */ + dram_vals[13] &= ~((0xf << 16) | (0xf << 24) | (0xf << 0)); + dram_vals[13] |= (0x6 << 16) | (0x6 << 24) | (0x2 << 0); + /* tDAL = 6*tCK */ + dram_vals[15] &= ~(0xf << 16); + dram_vals[15] |= (0x6 << 16); + /* tREF = 1040*tCK */ + dram_vals[26] &= ~0xffff; + dram_vals[26] |= 0x0410; + /* tRAS_MAX = 9334*tCK */ + dram_vals[32] &= ~0xffff; + dram_vals[32] |= 0x2475; +}