openwrt/target/linux/generic/hack-5.4/400-block-fit-partition-parser.patch

--- a/block/partitions/Kconfig
+++ b/block/partitions/Kconfig
@@ -101,6 +101,13 @@ config ATARI_PARTITION
 	  Say Y here if you would like to use hard disks under Linux which
 	  were partitioned under the Atari OS.
 
+config FIT_PARTITION
+	bool "Flattened-Image-Tree (FIT) partition support" if PARTITION_ADVANCED
+	default n
+	help
+	  Say Y here if your system needs to mount the filesystem part of
+	  a Flattened-Image-Tree (FIT) image commonly used with Das U-Boot.
+
 config IBM_PARTITION
 	bool "IBM disk label and partition support"
 	depends on PARTITION_ADVANCED && S390
--- a/block/partitions/Makefile
+++ b/block/partitions/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_ACORN_PARTITION) += acorn.o
 obj-$(CONFIG_AMIGA_PARTITION) += amiga.o
 obj-$(CONFIG_ATARI_PARTITION) += atari.o
 obj-$(CONFIG_AIX_PARTITION) += aix.o
+obj-$(CONFIG_FIT_PARTITION) += fit.o
 obj-$(CONFIG_CMDLINE_PARTITION) += cmdline.o
 obj-$(CONFIG_MAC_PARTITION) += mac.o
 obj-$(CONFIG_LDM_PARTITION) += ldm.o
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -396,7 +396,7 @@ int ubiblock_create(struct ubi_volume_in
 	dev->leb_size = vi->usable_leb_size;
 
 	/* Initialize the gendisk of this ubiblock device */
-	gd = alloc_disk(1);
+	gd = alloc_disk(0);
 	if (!gd) {
 		pr_err("UBI: block: alloc_disk failed\n");
 		ret = -ENODEV;
@@ -413,6 +413,7 @@ int ubiblock_create(struct ubi_volume_in
 		goto out_put_disk;
 	}
 	gd->private_data = dev;
+	gd->flags |= GENHD_FL_EXT_DEVT;
 	sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id);
 	set_capacity(gd, disk_capacity);
 	dev->gd = gd;
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -18,6 +18,10 @@
 #include <linux/ctype.h>
 #include <linux/genhd.h>
 #include <linux/blktrace_api.h>
+#ifdef CONFIG_FIT_PARTITION
+#include <linux/root_dev.h>
+#endif
+
 
 #include "partitions/check.h"
 
@@ -180,6 +184,18 @@ ssize_t part_fail_store(struct device *d
 }
 #endif
 
+static ssize_t part_name_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct hd_struct *p = dev_to_part(dev);
+
+	if (p->info && p->info->volname)
+		return sprintf(buf, "%s\n", p->info->volname);
+
+	buf[0] = '\0';
+	return 0;
+}
+
 static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
 static DEVICE_ATTR(start, 0444, part_start_show, NULL);
 static DEVICE_ATTR(size, 0444, part_size_show, NULL);
@@ -188,6 +204,7 @@ static DEVICE_ATTR(alignment_offset, 044
 static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
 static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
 static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
+static DEVICE_ATTR(name, 0444, part_name_show, NULL);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 static struct device_attribute dev_attr_fail =
 	__ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
@@ -202,6 +219,7 @@ static struct attribute *part_attrs[] =
 	&dev_attr_discard_alignment.attr,
 	&dev_attr_stat.attr,
 	&dev_attr_inflight.attr,
+	&dev_attr_name.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 	&dev_attr_fail.attr,
 #endif
@@ -634,6 +652,10 @@ rescan:
 		if (state->parts[p].flags & ADDPART_FLAG_RAID)
 			md_autodetect_dev(part_to_dev(part)->devt);
 #endif
+#ifdef CONFIG_FIT_PARTITION
+		if ((state->parts[p].flags & ADDPART_FLAG_ROOTDEV) && ROOT_DEV == 0)
+			ROOT_DEV = part_to_dev(part)->devt;
+#endif
 	}
 	free_partitions(state);
 	return 0;
--- a/block/partitions/check.c
+++ b/block/partitions/check.c
@@ -33,6 +33,7 @@
 #include "ibm.h"
 #include "ultrix.h"
 #include "efi.h"
+#include "fit.h"
 #include "karma.h"
 #include "sysv68.h"
 #include "cmdline.h"
@@ -73,6 +74,9 @@ static int (*check_part[])(struct parsed
 #ifdef CONFIG_EFI_PARTITION
 	efi_partition,		/* this must come before msdos */
 #endif
+#ifdef CONFIG_FIT_PARTITION
+	fit_partition,
+#endif
 #ifdef CONFIG_SGI_PARTITION
 	sgi_partition,
 #endif
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -614,6 +614,7 @@ struct unixware_disklabel {
 #define ADDPART_FLAG_NONE	0
 #define ADDPART_FLAG_RAID	1
 #define ADDPART_FLAG_WHOLEDISK	2
+#define ADDPART_FLAG_ROOTDEV	4
 
 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
 extern void blk_free_devt(dev_t devt);
--- /dev/null
+++ b/block/partitions/fit.h
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+int fit_partition(struct parsed_partitions *);
+int parse_fit_partitions(struct parsed_partitions *state, u64 start_sector, u64 nr_sectors, int *slot, int add_remain);
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -681,6 +681,9 @@ int efi_partition(struct parsed_partitio
 	gpt_entry *ptes = NULL;
 	u32 i;
 	unsigned ssz = bdev_logical_block_size(state->bdev) / 512;
+#ifdef CONFIG_FIT_PARTITION
+	u32 extra_slot = 64;
+#endif
 
 	if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
 		kfree(gpt);
@@ -722,6 +725,11 @@ int efi_partition(struct parsed_partitio
 			label_count++;
 		}
 		state->parts[i + 1].has_info = true;
+#ifdef CONFIG_FIT_PARTITION
+		/* If this is a U-Boot FIT volume it may have subpartitions */
+		if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_FIT_GUID))
+			(void) parse_fit_partitions(state, start * ssz, size * ssz, &extra_slot, 1);
+#endif
 	}
 	kfree(ptes);
 	kfree(gpt);
--- a/block/partitions/efi.h
+++ b/block/partitions/efi.h
@@ -52,6 +52,9 @@
 #define PARTITION_LINUX_LVM_GUID \
     EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
               0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+#define PARTITION_LINUX_FIT_GUID \
+    EFI_GUID( 0xcae9be83, 0xb15f, 0x49cc, \
+              0x86, 0x3f, 0x08, 0x1b, 0x74, 0x4a, 0x2d, 0x93)
 
 typedef struct _gpt_header {
 	__le64 signature;