1 /* 2 * Copyright 2008 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * Version 2 as published by the Free Software Foundation. 7 */ 8 9 #include <common.h> 10 11 #include <asm/fsl_ddr_sdram.h> 12 #include <asm/fsl_ddr_dimm_params.h> 13 14 void fsl_ddr_board_options(memctl_options_t *popts, 15 dimm_params_t *pdimm, 16 unsigned int ctrl_num) 17 { 18 /* 19 * Factors to consider for clock adjust: 20 * - number of chips on bus 21 * - position of slot 22 * - DDR1 vs. DDR2? 23 * - ??? 24 * 25 * This needs to be determined on a board-by-board basis. 26 * 0110 3/4 cycle late 27 * 0111 7/8 cycle late 28 */ 29 popts->clk_adjust = 7; 30 31 /* 32 * Factors to consider for CPO: 33 * - frequency 34 * - ddr1 vs. ddr2 35 */ 36 popts->cpo_override = 10; 37 38 /* 39 * Factors to consider for write data delay: 40 * - number of DIMMs 41 * 42 * 1 = 1/4 clock delay 43 * 2 = 1/2 clock delay 44 * 3 = 3/4 clock delay 45 * 4 = 1 clock delay 46 * 5 = 5/4 clock delay 47 * 6 = 3/2 clock delay 48 */ 49 popts->write_data_delay = 3; 50 51 /* 2T timing enable */ 52 popts->twot_en = 1; 53 54 /* 55 * Factors to consider for half-strength driver enable: 56 * - number of DIMMs installed 57 */ 58 popts->half_strength_driver_enable = 0; 59 } 60