diff options
| author | Mate Kukri <kukri.mate@gmail.com> | 2020-08-01 11:45:13 +0200 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-08-03 11:16:02 +0000 |
| commit | e053493717c5c061720c5ee6d4ccda0cab4b5549 (patch) | |
| tree | 3e62e07dd827cd4fca0605186c1c77dcbdda8dab | |
| parent | ac01106743705b3f27901635c0ff6a45b78e0449 (diff) | |
soc/intel/baytrail: Add MRC SMBus workaround
- The Bay Trail MRC fails to read the SPDs from SMBus.
- Instead the SPDs are read into a buffer and the buffer is passed to
the MRC.
Change-Id: I7f560d950cb4e4d118f3ee17e6e19e14cd0cc193
Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44092
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
| -rw-r--r-- | src/soc/intel/baytrail/romstage/raminit.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/soc/intel/baytrail/romstage/raminit.c b/src/soc/intel/baytrail/romstage/raminit.c index 7e6bcaba0f..6ff6c03131 100644 --- a/src/soc/intel/baytrail/romstage/raminit.c +++ b/src/soc/intel/baytrail/romstage/raminit.c @@ -115,11 +115,15 @@ static void print_dram_info(void *dram_data) populate_smbios_tables(dram_data, speed, num_channels); } +#define SPD_SIZE 256 +static u8 spd_buf[NUM_CHANNELS][SPD_SIZE]; + void raminit(struct mrc_params *mp, int prev_sleep_state) { int ret; mrc_wrapper_entry_t mrc_entry; struct region_device rdev; + size_t i; /* Fill in default entries. */ mp->version = MRC_PARAMS_VER; @@ -158,8 +162,20 @@ void raminit(struct mrc_params *mp, int prev_sleep_state) */ mrc_entry = (void *)(uintptr_t)CONFIG_MRC_BIN_ADDRESS; - if (mp->mainboard.dram_info_location == DRAM_INFO_SPD_SMBUS) + if (mp->mainboard.dram_info_location == DRAM_INFO_SPD_SMBUS) { + /* Workaround for broken SMBus support in the MRC */ enable_smbus(); + mp->mainboard.dram_info_location = DRAM_INFO_SPD_MEM; + for (i = 0; i < NUM_CHANNELS; ++i) { + if (mp->mainboard.spd_addrs[i]) { + i2c_eeprom_read(mp->mainboard.spd_addrs[i], + 0, SPD_SIZE, spd_buf[i]); + /* NOTE: MRC looks for Channel 1 SPD at array + index 1 */ + mp->mainboard.dram_data[i] = spd_buf; + } + } + } ret = mrc_entry(mp); |