[source] ar71xx: fix board detection with newer RouterBOOT versions

[LEDE Commits]

yousong pushed a commit to source.git, branch master:
https://git.lede-project.org/e7b48fcfe18f14cf3f4915dc3622599f7a91f9fc

commit e7b48fcfe18f14cf3f4915dc3622599f7a91f9fc
Author: Gabor Juhos <juhosg at freemail.hu>
AuthorDate: Fri Dec 8 23:31:55 2017 +0100

    ar71xx: fix board detection with newer RouterBOOT versions
    
    Recent RouterBOOT version (at least version 3.41 on RB911G-5HPacD)
    use "Board=" kernel parameter instead of "board=" to pass the board
    name to the kernel. Due to this change the board detection code is
    not working on the devices shipped with the new RouterBOOT version.
    Because the kernel is unable to identify these boards they become
    unusable despite that they are supported by the current code.
    
    Update the prom_init code to convert the 'Board' kernel parameter to
    'board'. After this change, the board detection works also with the
    new RouterBOOT versions.
    
    Signed-off-by: Gabor Juhos <juhosg at freemail.hu>
---
 ...PS-ath79-fixup-routerboot-board-parameter.patch | 43 ++++++++++++++++++++++
 ...PS-ath79-fixup-routerboot-board-parameter.patch | 43 ++++++++++++++++++++++
 2 files changed, 86 insertions(+)

diff --git a/target/linux/ar71xx/patches-4.4/702-MIPS-ath79-fixup-routerboot-board-parameter.patch b/target/linux/ar71xx/patches-4.4/702-MIPS-ath79-fixup-routerboot-board-parameter.patch
new file mode 100644
index 0000000..b8715bb
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.4/702-MIPS-ath79-fixup-routerboot-board-parameter.patch
@@ -0,0 +1,43 @@
+From: Gabor Juhos <juhosg at freemail.hu>
+Date: Sat, 2 Dec 2017 19:15:29 +0100
+Subject: [PATCH] MIPS: ath79: fix board detection with newer RouterBOOT versions
+
+Recent RouterBOOT version (at least version 3.41 on RB911G-5HPacD)
+use "Board=" kernel parameter instead of "board=" to pass the board
+name to the kernel. Due to this change the board detection code is
+not working on the devices shipped with the new RouterBOOT version.
+Because the kernel is unable to identify these boards they become
+unusable despite that they are supported by the current code.
+
+Update the prom_init code to convert the 'Board' kernel parameter to
+'board'. After this change, the board detection works also with the
+new RouterBOOT versions.
+
+Signed-off-by: Gabor Juhos <juhosg at freemail.hu>
+---
+--- a/arch/mips/ath79/prom.c
++++ b/arch/mips/ath79/prom.c
+@@ -104,6 +104,7 @@ static int __init ath79_prom_init_myload
+ void __init prom_init(void)
+ {
+ 	const char *env;
++	char *c;
+ 
+ 	if (ath79_prom_init_myloader())
+ 		return;
+@@ -137,6 +138,15 @@ void __init prom_init(void)
+ 	}
+ #endif
+ 
++	/*
++	 * RouterBOOT uses "Board" kernel parameter instead of "board" since
++	 * version 3.41 (or so). Replace the first character of the parameter
++	 * to keep board detection working.
++	 */
++	c = strstr(arcs_cmdline, "Board=");
++	if (c)
++		c[0] = 'b';
++
+ 	if (strstr(arcs_cmdline, "board=750Gr3") ||
+ 	    strstr(arcs_cmdline, "board=750i") ||
+ 	    strstr(arcs_cmdline, "board=750-hb") ||
diff --git a/target/linux/ar71xx/patches-4.9/702-MIPS-ath79-fixup-routerboot-board-parameter.patch b/target/linux/ar71xx/patches-4.9/702-MIPS-ath79-fixup-routerboot-board-parameter.patch
new file mode 100644
index 0000000..b8715bb
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/702-MIPS-ath79-fixup-routerboot-board-parameter.patch
@@ -0,0 +1,43 @@
+From: Gabor Juhos <juhosg at freemail.hu>
+Date: Sat, 2 Dec 2017 19:15:29 +0100
+Subject: [PATCH] MIPS: ath79: fix board detection with newer RouterBOOT versions
+
+Recent RouterBOOT version (at least version 3.41 on RB911G-5HPacD)
+use "Board=" kernel parameter instead of "board=" to pass the board
+name to the kernel. Due to this change the board detection code is
+not working on the devices shipped with the new RouterBOOT version.
+Because the kernel is unable to identify these boards they become
+unusable despite that they are supported by the current code.
+
+Update the prom_init code to convert the 'Board' kernel parameter to
+'board'. After this change, the board detection works also with the
+new RouterBOOT versions.
+
+Signed-off-by: Gabor Juhos <juhosg at freemail.hu>
+---
+--- a/arch/mips/ath79/prom.c
++++ b/arch/mips/ath79/prom.c
+@@ -104,6 +104,7 @@ static int __init ath79_prom_init_myload
+ void __init prom_init(void)
+ {
+ 	const char *env;
++	char *c;
+ 
+ 	if (ath79_prom_init_myloader())
+ 		return;
+@@ -137,6 +138,15 @@ void __init prom_init(void)
+ 	}
+ #endif
+ 
++	/*
++	 * RouterBOOT uses "Board" kernel parameter instead of "board" since
++	 * version 3.41 (or so). Replace the first character of the parameter
++	 * to keep board detection working.
++	 */
++	c = strstr(arcs_cmdline, "Board=");
++	if (c)
++		c[0] = 'b';
++
+ 	if (strstr(arcs_cmdline, "board=750Gr3") ||
+ 	    strstr(arcs_cmdline, "board=750i") ||
+ 	    strstr(arcs_cmdline, "board=750-hb") ||