CPO value and driver strength settings are board specifc. Also allow SPD data fetch from any accessible I2C EEPROM.
Signed-off-by: Andre Schwarz andre.schwarz@matrix-vision.de --- arch/powerpc/cpu/mpc83xx/spd_sdram.c | 19 ++++++++++++++++++- 1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/cpu/mpc83xx/spd_sdram.c b/arch/powerpc/cpu/mpc83xx/spd_sdram.c index 44aaa9a..9b01f0d 100644 --- a/arch/powerpc/cpu/mpc83xx/spd_sdram.c +++ b/arch/powerpc/cpu/mpc83xx/spd_sdram.c @@ -68,6 +68,12 @@ void board_add_ram_info(int use_default) #ifndef CONFIG_SYS_READ_SPD #define CONFIG_SYS_READ_SPD i2c_read #endif +#ifndef SPD_EEPROM_OFFSET +#define SPD_EEPROM_OFFSET 0 +#endif +#ifndef SPD_EEPROM_ADDR_LEN +#define SPD_EEPROM_ADDR_LEN 1 +#endif
/* * Convert picoseconds into clock cycles (rounding up if needed). @@ -160,7 +166,8 @@ long int spd_sdram() isync();
/* Read SPD parameters with I2C */ - CONFIG_SYS_READ_SPD(SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd)); + CONFIG_SYS_READ_SPD(SPD_EEPROM_ADDRESS, SPD_EEPROM_OFFSET, + SPD_EEPROM_ADDR_LEN, (uchar *) &spd, sizeof(spd)); #ifdef SPD_DEBUG spd_debug(&spd); #endif @@ -562,6 +569,9 @@ long int spd_sdram() * Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266. */ wr_data_delay = 2; +#ifdef CONFIG_SYS_DDR_WRITE_DATA_DELAY + wr_data_delay = CONFIG_SYS_DDR_WRITE_DATA_DELAY; +#endif
/* * Write Latency @@ -601,6 +611,9 @@ long int spd_sdram() */ cpo = 0; if (spd.mem_type == SPD_MEMTYPE_DDR2) { +#ifdef CONFIG_SYS_DDR_CPO + cpo = CONFIG_SYS_DDR_CPO; +#else if (effective_data_rate == 266) { cpo = 0x4; /* READ_LAT + 1/2 */ } else if (effective_data_rate == 333) { @@ -611,6 +624,7 @@ long int spd_sdram() /* Automatic calibration */ cpo = 0x1f; } +#endif }
ddr->timing_cfg_2 = (0 @@ -679,6 +693,9 @@ long int spd_sdram() ddr->sdram_mode = (0 | (1 << (16 + 10)) /* DQS Differential disable */ +#ifdef CONFIG_SYS_DDR_MODE_WEAK + | (1 << (16 + 1)) /* weak driver (~60%) */ +#endif | (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */ | (mode_odt_enable << 16) /* ODT Enable in EMRS1 */ | ((twr_clk - 1) << 9) /* Write Recovery Autopre */