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authorStephen Warren <swarren@nvidia.com>2012-07-30 10:55:43 +0000
committerTom Warren <twarren@nvidia.com>2012-09-07 13:54:31 -0700
commit29159057a168fce0fb473b7771bb4f0940527213 (patch)
tree6d4c53b1557da1fe10709f9681c346ef933656ee /drivers/mmc
parent0bc069b2e46ec673daf1c17ee86099fef7252660 (diff)
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mmc: detect boot sectors using EXT_CSD_BOOT_MULT too
Some eMMC devices contain boot partitions, but do not set the PART_SUPPORT bit in EXT_CSD_PARTITIONING_SUPPORT. Allow partition selection on such devices, by enabling partition switching when EXT_CSD_BOOT_MULT is set. Note that the Linux kernel enables access to boot partitions solely based on the value of EXT_CSD_BOOT_MULT; EXT_CSD_PARTITIONING_SUPPORT only influences access to "general" partitions. eMMC devices affected by this issue exist on various NVIDIA Tegra platforms (and presumably many others too), such as Harmony (plug-in eMMC), Seaboard, Springbank, and Whistler (plug-in eMMC). Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/mmc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index c1c2862..551d6a9 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1162,7 +1162,8 @@ int mmc_startup(struct mmc *mmc)
}
/* store the partition info of emmc */
- if (ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT)
+ if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) ||
+ ext_csd[EXT_CSD_BOOT_MULT])
mmc->part_config = ext_csd[EXT_CSD_PART_CONF];
}