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| author | Eric Peers <epeers@google.com> | 2020-07-18 08:37:45 -0600 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2020-07-23 21:13:34 +0000 |
| commit | be2d6541b98639de8e8e5492af526c022366df59 (patch) | |
| tree | 081a0d2f94d0a5138d7a9a85759fa7dea2b4bfdf /src/mainboard/google/zork/variants/dalboz | |
| parent | 77b89c8b183ea79b0c56f3378c36f2d421993f6d (diff) | |
| download | coreboot-be2d6541b98639de8e8e5492af526c022366df59.tar.gz coreboot-be2d6541b98639de8e8e5492af526c022366df59.tar.bz2 coreboot-be2d6541b98639de8e8e5492af526c022366df59.zip | |
mb/google/zork/variants/dalboz: Use HS200 for eMMC
Earlier versions of Dalboz did not correctly handle HS400. One fix was
to add stitching vias, but these boards did not have them. b/156539551
Another possible fix is to add tuning parameters including drive
strength, but that is still a WIP. b/158959725
This should correct OS load failures in the meantime by running the bus
slower.
BUG=b:158845662
TEST=build, flash, boot sku 0x5a80000c to OS
BRANCH=None
Signed-off-by: Eric Peers <epeers@google.com>
Change-Id: Ia3e7a641bde04c5a7be29bf91c38dd8c110ed17a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43572
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google/zork/variants/dalboz')
| -rw-r--r-- | src/mainboard/google/zork/variants/dalboz/variant.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/mainboard/google/zork/variants/dalboz/variant.c b/src/mainboard/google/zork/variants/dalboz/variant.c index 02121611a185..de4338e446bc 100644 --- a/src/mainboard/google/zork/variants/dalboz/variant.c +++ b/src/mainboard/google/zork/variants/dalboz/variant.c @@ -127,9 +127,21 @@ void variant_devtree_update(void) cfg = config_of_soc(); if (sku_has_emmc()) { - if (sku_id() == 0x5A800003) - /* rev0 boards have issues with HS400 */ + if ((sku_id() == 0x5A800003) || (sku_id() == 0x5A80000C)) { + /* + * rev0 and rev1 boards have issues with HS400 + * + * There is a tuning fix with ES which shows promise + * for some boards, and a HW fix with stitching vias. + * There were also concerns that these boards did not + * have good margins for certain skus. + * + * But these original boards have none of these fixes. + * So we keep the speed low here, with the intent that + * other variants implement these corrections. + */ cfg->sd_emmc_config = SD_EMMC_EMMC_HS200; + } } else { cfg->sd_emmc_config = SD_EMMC_DISABLE; } |