diff options
Diffstat (limited to 'target/linux/arc770/patches-4.4/0002-openwrt-arc-add-OWRTDTB-section.patch')
| -rw-r--r-- | target/linux/arc770/patches-4.4/0002-openwrt-arc-add-OWRTDTB-section.patch | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/target/linux/arc770/patches-4.4/0002-openwrt-arc-add-OWRTDTB-section.patch b/target/linux/arc770/patches-4.4/0002-openwrt-arc-add-OWRTDTB-section.patch deleted file mode 100644 index 02e919858d..0000000000 --- a/target/linux/arc770/patches-4.4/0002-openwrt-arc-add-OWRTDTB-section.patch +++ /dev/null @@ -1,91 +0,0 @@ -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(-) - -diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S -index 689dd86..51154ae 100644 ---- 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 - - ;---------------------------------------------------------------- -diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c -index e1b8744..9481c9d 100644 ---- a/arch/arc/kernel/setup.c -+++ b/arch/arc/kernel/setup.c -@@ -370,6 +370,8 @@ static inline int is_kernel(unsigned long addr) - return 0; - } - -+extern struct boot_param_header __image_dtb; -+ - void __init setup_arch(char **cmdline_p) - { - #ifdef CONFIG_ARC_UBOOT_SUPPORT -@@ -383,7 +385,7 @@ 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"); - -diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S -index 894e696..ecfc284 100644 ---- 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) --- -2.4.3 - |