[OpenWrt-Devel] [PATCH 3/7] kirkwood: find active Linksys root partition

[Claudio Leite]

This is imported verbatim from the mvebu WRT1900AC port.

It picks up the current boot partition from the kernel command line,
then renames that partition "ubi" so that it auto-mounts.

Signed-off-by: Claudio Leite <leitec at staticky.com>
---
 target/linux/kirkwood/config-3.18                  |  1 +
 target/linux/kirkwood/config-4.3                   |  1 +
 .../patches-3.18/100-find_active_root.patch        | 61 ++++++++++++++++++++++
 .../patches-4.3/100-find_active_root.patch         | 61 ++++++++++++++++++++++
 4 files changed, 124 insertions(+)
 create mode 100644 target/linux/kirkwood/patches-3.18/100-find_active_root.patch
 create mode 100644 target/linux/kirkwood/patches-4.3/100-find_active_root.patch

diff --git a/target/linux/kirkwood/config-3.18 b/target/linux/kirkwood/config-3.18
index b936ba9..17b2819 100644
--- a/target/linux/kirkwood/config-3.18
+++ b/target/linux/kirkwood/config-3.18
@@ -189,6 +189,7 @@ CONFIG_LZO_DECOMPRESS=y
 CONFIG_MACH_KIRKWOOD=y
 CONFIG_MACH_MVEBU_ANY=y
 # CONFIG_MACH_NETXBIG is not set
+CONFIG_MANGLE_BOOTARGS=y
 CONFIG_MDIO_BOARDINFO=y
 CONFIG_MIGHT_HAVE_PCI=y
 CONFIG_MMC=y
diff --git a/target/linux/kirkwood/config-4.3 b/target/linux/kirkwood/config-4.3
index 86eace5..1e68af5 100644
--- a/target/linux/kirkwood/config-4.3
+++ b/target/linux/kirkwood/config-4.3
@@ -197,6 +197,7 @@ CONFIG_MAC80211_STA_HASH_MAX_SIZE=0
 CONFIG_MACH_KIRKWOOD=y
 CONFIG_MACH_MVEBU_ANY=y
 # CONFIG_MACH_NETXBIG is not set
+CONFIG_MANGLE_BOOTARGS=y
 CONFIG_MDIO_BOARDINFO=y
 CONFIG_MIGHT_HAVE_PCI=y
 CONFIG_MMC=y
diff --git a/target/linux/kirkwood/patches-3.18/100-find_active_root.patch b/target/linux/kirkwood/patches-3.18/100-find_active_root.patch
new file mode 100644
index 0000000..e32b608
--- /dev/null
+++ b/target/linux/kirkwood/patches-3.18/100-find_active_root.patch
@@ -0,0 +1,61 @@
+The WRT1900AC among other Linksys routers uses a dual-firmware layout.
+Dynamically rename the active partition to "ubi".
+
+Signed-off-by: Imre Kaloz <kaloz at openwrt.org>
+
+--- a/drivers/mtd/ofpart.c
++++ b/drivers/mtd/ofpart.c
+@@ -25,12 +25,15 @@ static bool node_has_compatible(struct d
+ 	return of_get_property(pp, "compatible", NULL);
+ }
+ 
++static int mangled_rootblock;
++
+ static int parse_ofpart_partitions(struct mtd_info *master,
+ 				   struct mtd_partition **pparts,
+ 				   struct mtd_part_parser_data *data)
+ {
+ 	struct device_node *node;
+ 	const char *partname;
++	const char *owrtpart = "ubi";
+ 	struct device_node *pp;
+ 	int nr_parts, i;
+ 
+@@ -78,9 +81,15 @@ static int parse_ofpart_partitions(struc
+ 		(*pparts)[i].offset = of_read_number(reg, a_cells);
+ 		(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
+ 
+-		partname = of_get_property(pp, "label", &len);
+-		if (!partname)
+-			partname = of_get_property(pp, "name", &len);
++		if (mangled_rootblock && (i == mangled_rootblock)) {
++				partname = owrtpart;
++		} else {
++			partname = of_get_property(pp, "label", &len);
++
++			if (!partname)
++				partname = of_get_property(pp, "name", &len);
++		}
++
+ 		(*pparts)[i].name = partname;
+ 
+ 		if (of_get_property(pp, "read-only", &len))
+@@ -178,6 +187,18 @@ static int __init ofpart_parser_init(voi
+ 	return 0;
+ }
+ 
++static int __init active_root(char *str)
++{
++	get_option(&str, &mangled_rootblock);
++
++	if (!mangled_rootblock)
++		return 1;
++
++	return 1;
++}
++
++__setup("mangled_rootblock=", active_root);
++
+ static void __exit ofpart_parser_exit(void)
+ {
+ 	deregister_mtd_parser(&ofpart_parser);
diff --git a/target/linux/kirkwood/patches-4.3/100-find_active_root.patch b/target/linux/kirkwood/patches-4.3/100-find_active_root.patch
new file mode 100644
index 0000000..e32b608
--- /dev/null
+++ b/target/linux/kirkwood/patches-4.3/100-find_active_root.patch
@@ -0,0 +1,61 @@
+The WRT1900AC among other Linksys routers uses a dual-firmware layout.
+Dynamically rename the active partition to "ubi".
+
+Signed-off-by: Imre Kaloz <kaloz at openwrt.org>
+
+--- a/drivers/mtd/ofpart.c
++++ b/drivers/mtd/ofpart.c
+@@ -25,12 +25,15 @@ static bool node_has_compatible(struct d
+ 	return of_get_property(pp, "compatible", NULL);
+ }
+ 
++static int mangled_rootblock;
++
+ static int parse_ofpart_partitions(struct mtd_info *master,
+ 				   struct mtd_partition **pparts,
+ 				   struct mtd_part_parser_data *data)
+ {
+ 	struct device_node *node;
+ 	const char *partname;
++	const char *owrtpart = "ubi";
+ 	struct device_node *pp;
+ 	int nr_parts, i;
+ 
+@@ -78,9 +81,15 @@ static int parse_ofpart_partitions(struc
+ 		(*pparts)[i].offset = of_read_number(reg, a_cells);
+ 		(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
+ 
+-		partname = of_get_property(pp, "label", &len);
+-		if (!partname)
+-			partname = of_get_property(pp, "name", &len);
++		if (mangled_rootblock && (i == mangled_rootblock)) {
++				partname = owrtpart;
++		} else {
++			partname = of_get_property(pp, "label", &len);
++
++			if (!partname)
++				partname = of_get_property(pp, "name", &len);
++		}
++
+ 		(*pparts)[i].name = partname;
+ 
+ 		if (of_get_property(pp, "read-only", &len))
+@@ -178,6 +187,18 @@ static int __init ofpart_parser_init(voi
+ 	return 0;
+ }
+ 
++static int __init active_root(char *str)
++{
++	get_option(&str, &mangled_rootblock);
++
++	if (!mangled_rootblock)
++		return 1;
++
++	return 1;
++}
++
++__setup("mangled_rootblock=", active_root);
++
+ static void __exit ofpart_parser_exit(void)
+ {
+ 	deregister_mtd_parser(&ofpart_parser);
-- 
2.1.4
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