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| author | Rafał Miłecki <rafal@milecki.pl> | 2022-11-07 19:24:48 +0100 |
|---|---|---|
| committer | Rafał Miłecki <rafal@milecki.pl> | 2022-11-08 09:12:16 +0100 |
| commit | d33e49857e3ad76586ebe55334996b15cd45ca1b (patch) | |
| tree | d1dfb45f7ea9b6a0073fba46ee40113e616f6338 /target/linux/generic/backport-5.15 | |
| parent | 6a64eb2664c13bc7d6800747066603c27fcad8e0 (diff) | |
| download | upstream-d33e49857e3ad76586ebe55334996b15cd45ca1b.tar.gz upstream-d33e49857e3ad76586ebe55334996b15cd45ca1b.tar.bz2 upstream-d33e49857e3ad76586ebe55334996b15cd45ca1b.zip | |
kernel: backport support for "linux,rootfs" in DT
This DT property allows marking flash partition that Linux should use as
a root device. It's useful for devices that don't use U-Boot and cmdline
parser for partitioning. It may be used with "fixed-partitions" or some
dynamic partitioning based on flash content.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Diffstat (limited to 'target/linux/generic/backport-5.15')
| -rw-r--r-- | target/linux/generic/backport-5.15/408-v6.2-mtd-core-set-ROOT_DEV-for-partitions-marked-as-rootf.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/408-v6.2-mtd-core-set-ROOT_DEV-for-partitions-marked-as-rootf.patch b/target/linux/generic/backport-5.15/408-v6.2-mtd-core-set-ROOT_DEV-for-partitions-marked-as-rootf.patch new file mode 100644 index 0000000000..60b1764252 --- /dev/null +++ b/target/linux/generic/backport-5.15/408-v6.2-mtd-core-set-ROOT_DEV-for-partitions-marked-as-rootf.patch @@ -0,0 +1,47 @@ +From 26422ac78e9d8767bd4aabfbae616b15edbf6a1b Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Sat, 22 Oct 2022 23:13:18 +0200 +Subject: [PATCH] mtd: core: set ROOT_DEV for partitions marked as rootfs in DT +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This adds support for "linux,rootfs" binding that is used to mark flash +partition containing rootfs. It's useful for devices using device tree +that don't have bootloader passing root info in cmdline. + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> +Link: https://lore.kernel.org/linux-mtd/20221022211318.32009-2-zajec5@gmail.com +--- + drivers/mtd/mtdcore.c | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -28,6 +28,7 @@ + #include <linux/leds.h> + #include <linux/debugfs.h> + #include <linux/nvmem-provider.h> ++#include <linux/root_dev.h> + + #include <linux/mtd/mtd.h> + #include <linux/mtd/partitions.h> +@@ -746,6 +747,17 @@ int add_mtd_device(struct mtd_info *mtd) + not->add(mtd); + + mutex_unlock(&mtd_table_mutex); ++ ++ if (of_find_property(mtd_get_of_node(mtd), "linux,rootfs", NULL)) { ++ if (IS_BUILTIN(CONFIG_MTD)) { ++ pr_info("mtd: setting mtd%d (%s) as root device\n", mtd->index, mtd->name); ++ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, mtd->index); ++ } else { ++ pr_warn("mtd: can't set mtd%d (%s) as root device - mtd must be builtin\n", ++ mtd->index, mtd->name); ++ } ++ } ++ + /* We _know_ we aren't being removed, because + our caller is still holding us here. So none + of this try_ nonsense, and no bitching about it |