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From: Felix Fietkau <nbd@nbd.name>
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Subject: make rootfs split/detection more generic - patch can be moved to generic-2.6 after testing on other platforms
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lede-commit: 328e660b31f0937d52c5ae3d6e7029409918a9df
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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drivers/mtd/Kconfig | 17 +++++++++++++++++
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drivers/mtd/mtdpart.c | 35 +++++++++++++++++++++++++++++++++++
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include/linux/mtd/partitions.h | 2 ++
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3 files changed, 54 insertions(+)
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -12,6 +12,23 @@ menuconfig MTD
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if MTD
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+menu "OpenWrt specific MTD options"
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+
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+config MTD_ROOTFS_ROOT_DEV
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+ bool "Automatically set 'rootfs' partition to be root filesystem"
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+ default y
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+
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+config MTD_SPLIT_FIRMWARE
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+ bool "Automatically split firmware partition for kernel+rootfs"
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+ default y
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+
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+config MTD_SPLIT_FIRMWARE_NAME
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+ string "Firmware partition name"
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+ depends on MTD_SPLIT_FIRMWARE
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+ default "firmware"
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+
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+endmenu
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+
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config MTD_TESTS
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tristate "MTD tests support (DANGEROUS)"
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depends on m
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -15,10 +15,12 @@
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#include <linux/kmod.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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+#include <linux/magic.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include "mtdcore.h"
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+#include "mtdsplit/mtdsplit.h"
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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@@ -38,6 +40,8 @@ struct mtd_part {
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struct list_head list;
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};
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+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
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+
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/*
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* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
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* the pointer to that structure.
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@@ -612,6 +616,7 @@ int mtd_add_partition(struct mtd_info *p
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if (ret)
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goto err_remove_part;
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+ mtd_partition_split(parent, new);
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mtd_add_partition_attrs(new);
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return 0;
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@@ -698,6 +703,29 @@ int mtd_del_partition(struct mtd_info *m
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}
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EXPORT_SYMBOL_GPL(mtd_del_partition);
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+#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
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+#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
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+#else
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+#define SPLIT_FIRMWARE_NAME "unused"
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+#endif
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+
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+static void split_firmware(struct mtd_info *master, struct mtd_part *part)
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+{
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+}
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+
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+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
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+{
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+ static int rootfs_found = 0;
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+
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+ if (rootfs_found)
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+ return;
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+
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+ if (IS_ENABLED(CONFIG_MTD_SPLIT_FIRMWARE) &&
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+ !strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
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+ !of_find_property(mtd_get_of_node(&part->mtd), "compatible", NULL))
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+ split_firmware(master, part);
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+}
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+
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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@@ -738,6 +766,7 @@ int add_mtd_partitions(struct mtd_info *
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goto err_del_partitions;
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}
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+ mtd_partition_split(master, slave);
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mtd_add_partition_attrs(slave);
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/* Look for subpartitions */
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parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
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