[U-Boot] [PATCH 1/3] mmc: detect boot sectors using EXT_CSD_BOOT_MULT too
Stephen Warren
swarren at wwwdotorg.org
Mon Jul 30 22:55:43 CEST 2012
From: Stephen Warren <swarren at nvidia.com>
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 at nvidia.com>
---
drivers/mmc/mmc.c | 3 ++-
include/mmc.h | 1 +
2 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index aebe578..3b08953 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1157,7 +1157,8 @@ 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];
}
diff --git a/include/mmc.h b/include/mmc.h
index 2305986..89df83c 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -159,6 +159,7 @@
#define EXT_CSD_CARD_TYPE 196 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
#define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */
+#define EXT_CSD_BOOT_MULT 226 /* RO */
/*
* EXT_CSD field definitions
--
1.7.0.4
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