diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0042-arc-add-OWRTDTB-section.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0042-arc-add-OWRTDTB-section.patch | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/nixos/modules/kernel-patches/0042-arc-add-OWRTDTB-section.patch b/nixos/modules/kernel-patches/0042-arc-add-OWRTDTB-section.patch deleted file mode 100644 index 402ea47..0000000 --- a/nixos/modules/kernel-patches/0042-arc-add-OWRTDTB-section.patch +++ /dev/null @@ -1,93 +0,0 @@ -From ec54842bfce8240815a9ce7a1db0935851fe9ea8 Mon Sep 17 00:00:00 2001 -From: Evgeniy Didin <Evgeniy.Didin@synopsys.com> -Date: Fri, 15 Mar 2019 18:53:38 +0300 -Subject: [PATCH 42/96] 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: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> -Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> -Signed-off-by: Evgeniy Didin <Evgeniy.Didin@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 9152782444b5..167d81ce6ab7 100644 ---- a/arch/arc/kernel/head.S -+++ b/arch/arc/kernel/head.S -@@ -88,6 +88,16 @@ - DSP_EARLY_INIT - .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 41f07b3e594e..d0c3e7817022 100644 ---- a/arch/arc/kernel/setup.c -+++ b/arch/arc/kernel/setup.c -@@ -495,6 +495,8 @@ static inline bool uboot_arg_invalid(unsigned long addr) - /* We always pass 0 as magic from U-boot */ - #define UBOOT_MAGIC_VALUE 0 - -+extern struct boot_param_header __image_dtb; -+ - void __init handle_uboot_args(void) - { - bool use_embedded_dtb = true; -@@ -533,7 +535,7 @@ void __init handle_uboot_args(void) - ignore_uboot_args: - - if (use_embedded_dtb) { -- 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 529ae50f9fe2..ecdcd6842c0d 100644 ---- a/arch/arc/kernel/vmlinux.lds.S -+++ b/arch/arc/kernel/vmlinux.lds.S -@@ -27,6 +27,19 @@ 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) --- -2.37.2 - |