From 0843a61d6913bdac8889eb048ed89f7903059787 Mon Sep 17 00:00:00 2001 From: Robert Marko Date: Fri, 30 Oct 2020 13:36:31 +0100 Subject: [PATCH] arm: compressed: add appended DTB section This adds a appended_dtb section to the ARM decompressor linker script. This allows using the existing ARM zImage appended DTB support for appending a DTB to the raw ELF kernel. Its size is set to 1MB max to match the zImage appended DTB size limit. To use it to pass the DTB to the kernel, objcopy is used: objcopy --set-section-flags=.appended_dtb=alloc,contents \ --update-section=.appended_dtb=.dtb vmlinux This is based off the following patch: https://github.com/openwrt/openwrt/commit/c063e27e02a9dcac0e7f5877fb154e58fa3e1a69 Signed-off-by: Robert Marko --- arch/arm/boot/compressed/vmlinux.lds.S | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/arch/arm/boot/compressed/vmlinux.lds.S +++ b/arch/arm/boot/compressed/vmlinux.lds.S @@ -103,6 +103,13 @@ SECTIONS _edata = .; + .appended_dtb : { + /* leave space for appended DTB */ + . += 0x100000; + } + + _edata_dtb = .; + /* * The image_end section appears after any additional loadable sections * that the linker may decide to insert in the binary image. Having @@ -140,4 +147,4 @@ SECTIONS ARM_ASSERTS } -ASSERT(_edata_real == _edata, "error: zImage file size is incorrect"); +ASSERT(_edata_real == _edata_dtb, "error: zImage file size is incorrect");