diff options
Diffstat (limited to 'board/sbc8548/ddr.c')
| -rw-r--r-- | board/sbc8548/ddr.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/board/sbc8548/ddr.c b/board/sbc8548/ddr.c index 0d9a1ba..45ec485 100644 --- a/board/sbc8548/ddr.c +++ b/board/sbc8548/ddr.c @@ -7,6 +7,7 @@ */ #include <common.h> +#include <i2c.h> #include <asm/fsl_ddr_sdram.h> #include <asm/fsl_ddr_dimm_params.h> @@ -55,7 +56,35 @@ void fsl_ddr_board_options(memctl_options_t *popts, popts->half_strength_driver_enable = 0; } -#if !defined(CONFIG_SPD_EEPROM) +#ifdef CONFIG_SPD_EEPROM +/* + * Workaround for hardware errata. An i2c address conflict + * existed on earlier boards; the workaround moved the DDR + * SPD from 0x51 to 0x53. So we try and read 0x53 1st, and + * if that fails, then fall back to reading at 0x51. + */ +void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address) +{ + int ret; + +#ifdef ALT_SPD_EEPROM_ADDRESS + if (i2c_address == SPD_EEPROM_ADDRESS) { + ret = i2c_read(ALT_SPD_EEPROM_ADDRESS, 0, 1, (uchar *)spd, + sizeof(generic_spd_eeprom_t)); + if (ret == 0) + return; /* Good data at 0x53 */ + memset(spd, 0, sizeof(generic_spd_eeprom_t)); + } +#endif + ret = i2c_read(i2c_address, 0, 1, (uchar *)spd, + sizeof(generic_spd_eeprom_t)); + if (ret) { + printf("DDR: failed to read SPD from addr %u\n", i2c_address); + memset(spd, 0, sizeof(generic_spd_eeprom_t)); + } +} + +#else /* * fixed_sdram init -- doesn't use serial presence detect. * Assumes 256MB DDR2 SDRAM SODIMM, without ECC, running at DDR400 speed. |