Re: [PATCH 02/10] arm: Update linker scripts to ensure appended device tree is aligned

[Fabio Estevam]

On Thu, Jan 22, 2026 at 9:25 PM Fabio Estevam <feste...@gmail.com> wrote:

> The commit in the Subject is what appends 4 bytes, and the binary is
> now shifted, causing the boot failure:
>
> hexdump -Cv spl/u-boot-spl.bin | grep 'd0 0d fe ed'
> 00015f10  00 00 00 00 d0 0d fe ed  00 00 0a 43 00 00 00 38  |...........C...8|

To make things simple, let's use a supported board in mainline.

Please follow these steps to reproduce the bug:

U-Boot top-of-tree:

make mrproper
make sonoff-ihost-rv1126_defconfig
cat spl/u-boot-spl.map | grep __bss_end
                0x000000000000b468                __bss_end = .
                0x0000000000000054                __bss_size =
(__bss_end - __bss_start)

hexdump -Cv spl/u-boot-spl.bin | grep 'd0 0d fe ed'
000016d0  a9 98 00 00 15 15 00 00  d0 0d fe ed 48 99 00 00  |............H...|
00001d20  08 00 70 47 6f f0 12 00  70 47 00 bf d0 0d fe ed  |..pGo...pG......|
0000b460  00 00 00 00 00 00 00 00  00 00 00 00 d0 0d fe ed  |................|

b468 contains 00 00 00 00 instead of FDT_MAGIC. FDT_MAGIC appears at b468 + 4.

After reverting 8b0ebe054bb3334c6ca9bed018360b08d4ddc7a4:

cat spl/u-boot-spl.map | grep __bss_end
                0x000000000000b468                __bss_end = .
                0x0000000000000054                __bss_size =
(__bss_end - __bss_start)
hexdump -Cv spl/u-boot-spl.bin | grep 'd0 0d fe ed'
000016d0  a9 98 00 00 15 15 00 00  d0 0d fe ed 48 99 00 00  |............H...|
00001d20  08 00 70 47 6f f0 12 00  70 47 00 bf d0 0d fe ed  |..pGo...pG......|
0000b460  00 00 00 00 00 00 00 00  d0 0d fe ed 00 00 0d 95  |................|

b468 contains FDT_MAGIC as expected.