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kernel: mips: zboot: put appended dtb into a section

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This will make a separated section for dtb appear in ELF, and we can
then use objcopy to patch a dtb into vmlinuz when RAW_APPENDED_DTB
is set in kernel config.

command to patch a dtb:
objcopy --set-section-flags=.appended_dtb=alloc,contents \
        --update-section=.appended_dtb=<target>.dtb vmlinuz vmlinuz-dtb

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Signed-off-by: maurerr <mariusd84@gmail.com>
This commit is contained in:
Chuanhong Guo 2020-10-29 21:22:57 +08:00 committed by maurerr
parent f9c91515b6
commit da6e395c30
1 changed files with 36 additions and 0 deletions
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36
target/linux/generic/pending-5.4/311-MIPS-zboot-put-appended-dtb-into-a-section.patch Normal file
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@ -0,0 +1,36 @@
From 7d1531c81c0fb4c93bea8dc316043ad0e4d0c270 Mon Sep 17 00:00:00 2001
From: Chuanhong Guo <gch981213@gmail.com>
Date: Sun, 25 Oct 2020 23:19:40 +0800
Subject: [PATCH] MIPS: zboot: put appended dtb into a section
This will make a separated section for dtb appear in ELF, and we can
then use objcopy to patch a dtb into vmlinuz when RAW_APPENDED_DTB
is set in kernel config.
command to patch a dtb:
objcopy --set-section-flags=.appended_dtb=alloc,contents \
--update-section=.appended_dtb=<target>.dtb vmlinuz vmlinuz-dtb
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
---
arch/mips/boot/compressed/ld.script | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/arch/mips/boot/compressed/ld.script
+++ b/arch/mips/boot/compressed/ld.script
@@ -31,9 +31,12 @@ SECTIONS
CONSTRUCTORS
. = ALIGN(16);
}
- __appended_dtb = .;
- /* leave space for appended DTB */
- . += 0x100000;
+
+ .appended_dtb : {
+ __appended_dtb = .;
+ /* leave space for appended DTB */
+ . += 0x100000;
+ }
_edata = .;
/* End of data section */