kernel: add linux 4.9 support

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Tim Harvey <tharvey@gateworks.com> [fixes]

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.9/332-arc-add-OWRTDTB-section.patch b/target/linux/generic/patches-4.9/332-arc-add-OWRTDTB-section.patch
new file mode 100644
index 0000000000..9761fa3711
--- /dev/null
+++ b/target/linux/generic/patches-4.9/332-arc-add-OWRTDTB-section.patch
@@ -0,0 +1,82 @@
+From 690e7f2cad271595ff68cace1c45fb10779bde41 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin@synopsys.com>
+Date: Fri, 15 Jan 2016 00:34:01 +0300
+Subject: [PATCH 2/2] openwrt: arc - add OWRTDTB section
+
+This change allows OpenWRT to patch resulting kernel binary with
+external .dtb.
+
+That allows us to re-use exactky the same vmlinux on different boards
+given its ARC core configurations match (at least cache line sizes etc).
+
+""patch-dtb" searches for ASCII "OWRTDTB:" strign and copies external
+.dtb right after it, keeping the string in place.
+
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ arch/arc/kernel/head.S        | 10 ++++++++++
+ arch/arc/kernel/setup.c       |  4 +++-
+ arch/arc/kernel/vmlinux.lds.S | 13 +++++++++++++
+ 3 files changed, 26 insertions(+), 1 deletion(-)
+
+--- a/arch/arc/kernel/head.S
++++ b/arch/arc/kernel/head.S
+@@ -49,6 +49,16 @@
+ 1:
+ .endm
+ 
++; Here "patch-dtb" will embed external .dtb
++; Note "patch-dtb" searches for ASCII "OWRTDTB:" string
++; and pastes .dtb right after it, hense the string precedes
++; __image_dtb symbol.
++	.section .owrt, "aw",@progbits
++	.ascii	"OWRTDTB:"
++ENTRY(__image_dtb)
++	.fill	0x4000
++END(__image_dtb)
++
+ 	.section .init.text, "ax",@progbits
+ 
+ ;----------------------------------------------------------------
+--- a/arch/arc/kernel/setup.c
++++ b/arch/arc/kernel/setup.c
+@@ -388,6 +388,8 @@ static inline int is_kernel(unsigned lon
+ 	return 0;
+ }
+ 
++extern struct boot_param_header __image_dtb;
++
+ void __init setup_arch(char **cmdline_p)
+ {
+ #ifdef CONFIG_ARC_UBOOT_SUPPORT
+@@ -401,7 +403,7 @@ void __init setup_arch(char **cmdline_p)
+ #endif
+ 	{
+ 		/* No, so try the embedded one */
+-		machine_desc = setup_machine_fdt(__dtb_start);
++		machine_desc = setup_machine_fdt(&__image_dtb);
+ 		if (!machine_desc)
+ 			panic("Embedded DT invalid\n");
+ 
+--- a/arch/arc/kernel/vmlinux.lds.S
++++ b/arch/arc/kernel/vmlinux.lds.S
+@@ -30,6 +30,19 @@ SECTIONS
+ 
+ 	. = CONFIG_LINUX_LINK_BASE;
+ 
++	/*
++	 * In OpenWRT we want to patch built binary embedding .dtb of choice.
++	 * This is implemented with "patch-dtb" utility which searches for
++	 * "OWRTDTB:" string in first 16k of image and if it is found
++	 * copies .dtb right after mentioned string.
++	 *
++	 * Note: "OWRTDTB:" won't be overwritten with .dtb, .dtb will follow it.
++	 */
++	.owrt : {
++		*(.owrt)
++		. = ALIGN(PAGE_SIZE);
++	}
++
+ 	_int_vec_base_lds = .;
+ 	.vector : {
+ 		*(.vector)