diff options
Diffstat (limited to 'board/amcc/kilauea')
| -rw-r--r-- | board/amcc/kilauea/kilauea.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/board/amcc/kilauea/kilauea.c b/board/amcc/kilauea/kilauea.c index f407e19..1caa2fd 100644 --- a/board/amcc/kilauea/kilauea.c +++ b/board/amcc/kilauea/kilauea.c @@ -374,3 +374,34 @@ int post_hotkeys_pressed(void) return 0; /* No hotkeys supported */ } #endif /* CONFIG_POST */ + +#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION) +/* + * This is for quicker auto calibration boot up once WRDTR and CLKTR + * values for the kilauea board were determined and are therefore known. + * + * Use these scan options for PLB bus greater than or equal 200MHz + * else use the defaults. These options are known to return a cycle + * delay of T2 or better with a 200MHz PLB bus. Scanning the + * full list of WDTR/CLKTR should work, but currently it does not. + * HW team is investigating. + */ +/* List of (SDRAM_WRDTR.[WDTR], SDRAM_CLKTR.[CLKP]) pairs to try */ +struct sdram_timing quick_scan_options[] = { + {0, 3}, {1, 1}, {1, 2}, {1, 3}, + {2, 1}, {2, 2}, {2, 3}, {3, 1}, + {3, 2}, {4, 1}, {-1, -1} +}; + +ulong ddr_scan_option(ulong default_val) +{ + PPC4xx_SYS_INFO board_cfg; + + get_sys_info(&board_cfg); + + if (board_cfg.freqPLB >= 200000000) + return (ulong)(quick_scan_options); + else + return (ulong)default_val; +} +#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */ |