49 lines
1.5 KiB
Diff
49 lines
1.5 KiB
Diff
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From 0843a61d6913bdac8889eb048ed89f7903059787 Mon Sep 17 00:00:00 2001
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From: Robert Marko <robimarko@gmail.com>
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Date: Fri, 30 Oct 2020 13:36:31 +0100
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Subject: [PATCH] arm: compressed: add appended DTB section
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This adds a appended_dtb section to the ARM decompressor
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linker script.
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This allows using the existing ARM zImage appended DTB support for
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appending a DTB to the raw ELF kernel.
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Its size is set to 1MB max to match the zImage appended DTB size limit.
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To use it to pass the DTB to the kernel, objcopy is used:
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objcopy --set-section-flags=.appended_dtb=alloc,contents \
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--update-section=.appended_dtb=<target>.dtb vmlinux
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This is based off the following patch:
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https://github.com/openwrt/openwrt/commit/c063e27e02a9dcac0e7f5877fb154e58fa3e1a69
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Signed-off-by: Robert Marko <robimarko@gmail.com>
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---
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arch/arm/boot/compressed/vmlinux.lds.S | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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--- a/arch/arm/boot/compressed/vmlinux.lds.S
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+++ b/arch/arm/boot/compressed/vmlinux.lds.S
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@@ -93,6 +93,13 @@ SECTIONS
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_edata = .;
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+ .appended_dtb : {
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+ /* leave space for appended DTB */
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+ . += 0x100000;
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+ }
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+
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+ _edata_dtb = .;
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+
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/*
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* The image_end section appears after any additional loadable sections
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* that the linker may decide to insert in the binary image. Having
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@@ -132,4 +139,4 @@ SECTIONS
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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}
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-ASSERT(_edata_real == _edata, "error: zImage file size is incorrect");
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+ASSERT(_edata_real == _edata_dtb, "error: zImage file size is incorrect");
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