[U-Boot] [PATCH v4 1/2] SPL: add support to boot from a partition type

[Dalon Westergreen <dwesterg@gmail.com>]

From: Dalon Westergreen <dalon.westergreen@intel.com>

the socfpga bootrom supports mmc booting from either a raw image
starting at 0x0, or from a partition of type 0xa2.  This patch
adds support for locating the boot image in the first type 0xa2
partition found.

Assigned a partition number of -1 will cause a search for a
partition of type CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
and use it to find the u-boot image

Signed-off-by: Dalon Westergreen <dwesterg@gmail.com>

--
Changes in V4:
 - Try search for partition type and failover to the defined
   partition number
Changes in V3:
 - Add depends on DOS_PARTITION
 - Ensure that PARTTION_TYPE defaults to non-zero
 - Add ifdef around sys_ind in disk_partition structure
Changes in V2:
 - Merge partition search into single partition function
---
 common/spl/Kconfig   | 17 +++++++++++++++++
 common/spl/spl_mmc.c | 15 +++++++++++++++
 disk/part_dos.c      |  1 +
 include/part.h       |  3 +++
 4 files changed, 36 insertions(+)

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index b2ba492..37e002f 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -96,6 +96,23 @@ config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
 	  Address on the MMC to load U-Boot from, when the MMC is being used
 	  in raw mode. Units: MMC sectors (1 sector = 512 bytes).
 
+config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
+	bool "MMC raw mode: by partition type"
+	depends on SPL && DOS_PARTITION
+	default y if ARCH_SOCFPGA
+	help
+	  Use partition type for specifying U-Boot partition on MMC/SD in
+	  raw mode. U-Boot will be loaded from the first partition of this
+	  type to be found.
+
+config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
+	hex "Partition Type on the MMC to load U-Boot from"
+	depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
+	default 0xa2
+	help
+	  Partition Type on the MMC to load U-Boot from, when the MMC is being
+	  used in raw mode.
+
 config TPL
 	bool
 	depends on SPL && SUPPORT_TPL
diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 0cd355c..8119fc1 100644
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -157,6 +157,21 @@ static int mmc_load_image_raw_partition(struct spl_image_info *spl_image,
 	disk_partition_t info;
 	int err;
 
+#ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
+	int type_part;
+	/* Only support MBR so DOS_ENTRY_NUMBERS */
+	for (type_part = 1; type_part <= DOS_ENTRY_NUMBERS; type_part++) {
+		err = part_get_info(mmc_get_blk_desc(mmc), type_part, &info);
+		if(err)
+			continue;
+		if(info.sys_ind == CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE)
+		{
+			partition = type_part;
+			break;
+		}
+	}
+#endif
+
 	err = part_get_info(mmc_get_blk_desc(mmc), partition, &info);
 	if (err) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
diff --git a/disk/part_dos.c b/disk/part_dos.c
index c77d881..7ede15e 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -217,6 +217,7 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 #endif
+			info->sys_ind = pt->sys_ind;
 			return 0;
 		}
 
diff --git a/include/part.h b/include/part.h
index 9d0e20d..b6d1b33 100644
--- a/include/part.h
+++ b/include/part.h
@@ -59,6 +59,9 @@ typedef struct disk_partition {
 #ifdef CONFIG_PARTITION_TYPE_GUID
 	char	type_guid[37];	/* type GUID as string, if exists	*/
 #endif
+#ifdef CONFIG_DOS_PARTITION
+	uchar	sys_ind;	/* partition type 			*/
+#endif
 } disk_partition_t;
 
 /* Misc _get_dev functions */
-- 
2.7.4