[PATCH v2 2/2] ARM: OMAP2+: Pad SPL binary to 8-byte alignment before DTB

[Beleswar Padhi]

The OMAP2 SPL linker script (also used for K3 platforms) currently uses
a 4-byte alignment directive after the __u_boot_list section. This
alignment directive only advances the location counter without padding
the actual binary output.

When objcopy extracts u-boot-spl-nodtb.bin, it includes only actual
data, stopping at the last byte of __u_boot_list (e.g., 0x41c359fc),
not an aligned address (e.g., 0x41c35a00). So, when the FIT image
containing device trees is concatenated to the SPL binary, it gets
appended at this unaligned file size, causing libfdt validation failure.

To fix this, move the alignment directive into the __u_boot_list section
itself and make it 8-byte aligned as per DT spec. This forces the linker
to include padding as part of the section data, ensuring objcopy
includes the padding bytes in the binary and the appended FIT image
starts at an 8-byte aligned boundary.

Reported-by: Anshul Dalal <anshuld at ti.com>
Closes: https://lore.kernel.org/u-boot/DFJ950O0QM0D.380U0N16ZO19E@ti.com
Fixes: 0535e46d55d7 ("scripts/dtc: Update to upstream version v1.7.2-35-g52f07dcca47c")
Signed-off-by: Beleswar Padhi <b-padhi at ti.com>
---
v2: Changelog:
1. Get rid of extra ALIGN() directive, replace it with a comment
2. Carry Reported-by, Closes and Fixes tag.

Link to v1:
https://lore.kernel.org/all/20260109190026.58464-3-b-padhi@ti.com/

 arch/arm/mach-omap2/u-boot-spl.lds | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap2/u-boot-spl.lds b/arch/arm/mach-omap2/u-boot-spl.lds
index 3bb759d8a1c..5ad169a37b7 100644
--- a/arch/arm/mach-omap2/u-boot-spl.lds
+++ b/arch/arm/mach-omap2/u-boot-spl.lds
@@ -35,9 +35,13 @@ SECTIONS
 	. = ALIGN(4);
 	__u_boot_list : {
 		KEEP(*(SORT(__u_boot_list*)));
+		/*
+		 * Ensure 8-byte alignment at the end of the last section before
+		 * DTB is appended, to satisfy DT spec alignment requirements
+		 */
+		. = ALIGN(8);
 	} >.sram
 
-	. = ALIGN(4);
 	__image_copy_end = .;
 	_end = .;
 	_image_binary_end = .;
-- 
2.34.1