linux-kernel - [PATCH] microblaze: Fix built-in DTB alignment to be 8-byte aligned

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Message-Id: <20210213011624.251838-1-robh@kernel.org>
Date:   Fri, 12 Feb 2021 19:16:24 -0600
From:   Rob Herring <robh@...nel.org>
To:     devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Michal Simek <monstr@...str.eu>
Subject: [PATCH] microblaze: Fix built-in DTB alignment to be 8-byte aligned

Commit 79edff12060f ("scripts/dtc: Update to upstream version
v1.6.0-51-g183df9e9c2b9") broke booting on Microblaze systems depending on
the build. The problem is libfdt gained an 8-byte starting alignment check,
but the Microblaze built-in DTB area is only 4-byte aligned. This affected
not just built-in DTBs as bootloader passed DTBs are copied into the
built-in DTB region.

Other arches using built-in DTBs use a common linker macro which has
sufficient alignment.

Fixes: 79edff12060f ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Tested-by: Guenter Roeck <linux@...ck-us.net>
Cc: Michal Simek <monstr@...str.eu>
Signed-off-by: Rob Herring <robh@...nel.org>
---
As the commit is in my tree, I'll take this via the DT tree.

 arch/microblaze/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index df07b3d06cd6..fb31747ec092 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -45,7 +45,7 @@ SECTIONS {
 		_etext = . ;
 	}
 
-	. = ALIGN (4) ;
+	. = ALIGN (8) ;
 	__fdt_blob : AT(ADDR(__fdt_blob) - LOAD_OFFSET) {
 		_fdt_start = . ;		/* place for fdt blob */
 		*(__fdt_blob) ;			/* Any link-placed DTB */
-- 
2.27.0