diff options
Diffstat (limited to 'target/linux/generic/pending-5.4/332-arc-add-OWRTDTB-section.patch')
| -rw-r--r-- | target/linux/generic/pending-5.4/332-arc-add-OWRTDTB-section.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.4/332-arc-add-OWRTDTB-section.patch b/target/linux/generic/pending-5.4/332-arc-add-OWRTDTB-section.patch new file mode 100644 index 0000000000..ec89547726 --- /dev/null +++ b/target/linux/generic/pending-5.4/332-arc-add-OWRTDTB-section.patch @@ -0,0 +1,84 @@ +From 34ef04f3845ed2b47d57dd9d3b795b16e1f8185a 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] 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(-) + +--- a/arch/arc/kernel/head.S ++++ b/arch/arc/kernel/head.S +@@ -59,6 +59,16 @@ + #endif + .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 +@@ -526,7 +526,7 @@ 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"); + } +@@ -542,6 +542,8 @@ ignore_uboot_args: + } + } + ++extern struct boot_param_header __image_dtb; ++ + void __init setup_arch(char **cmdline_p) + { + handle_uboot_args(); +--- 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) |