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linux-postmarketos-qcom-sm8550: dtbo with a no-op overlay, not empty

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A zero-entry DT table (32 bytes) fails Motorola's fastboot pre-flash
validation. Build a real no-op overlay with the kernel's dtc, wrap it in
a 1-entry DT table padded to 4 KB. Still applies nothing to the base DTB.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QF5HebjUsRaxbW4cBX6HJP
This commit is contained in:
snlavaise
2026-09-08 22:13:55 -03:00
co-authored by Claude Sonnet 5
parent 34600bc55e
commit ce9763708c
1 changed files with 22 additions and 9 deletions
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device/testing/linux-postmarketos-qcom-sm8550/APKBUILD
+22 -9
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@@ -5,7 +5,7 @@ maintainer="snlavaise <snlavaise@gmail.com>"
_flavor="postmarketos-qcom-sm8550" _flavor="postmarketos-qcom-sm8550"
pkgname=linux-$_flavor pkgname=linux-$_flavor
pkgver=7.2 pkgver=7.2
pkgrel=3 pkgrel=4
pkgdesc="Mainline kernel for Qualcomm SM8550 (Snapdragon 8 Gen 2) + Motorola rtwo" pkgdesc="Mainline kernel for Qualcomm SM8550 (Snapdragon 8 Gen 2) + Motorola rtwo"
arch="aarch64" arch="aarch64"
_carch="arm64" _carch="arm64"
@@ -80,14 +80,6 @@ package() {
install -Dm644 "$builddir/arch/$_carch/boot/Image" \ install -Dm644 "$builddir/arch/$_carch/boot/Image" \
"$pkgdir/boot/vmlinuz" "$pkgdir/boot/vmlinuz"
# Empty Android DT-overlay table (magic d7b7ab1e, 0 entries). The
# bootloader would otherwise apply the stock kalama dtbo overlay onto
# our mainline base DTB - the phandles don't match, the merged DTB is
# corrupt and the kernel panics. Flash this to the dtbo partition.
mkdir -p "$pkgdir"/boot
printf '\xd7\xb7\xab\x1e\x00\x00\x00\x20\x00\x00\x00\x20\x00\x00\x00\x20\x00\x00\x00\x00\x00\x00\x00\x20\x00\x00\x08\x00\x00\x00\x00\x00' \
> "$pkgdir"/boot/dtbo.img
make modules_install dtbs_install \ make modules_install dtbs_install \
ARCH="$_carch" \ ARCH="$_carch" \
LLVM=1 \ LLVM=1 \
@@ -95,6 +87,27 @@ package() {
INSTALL_MOD_STRIP=1 \ INSTALL_MOD_STRIP=1 \
INSTALL_DTBS_PATH="$pkgdir"/boot/dtbs INSTALL_DTBS_PATH="$pkgdir"/boot/dtbs
# Android DT-overlay image with a single no-op overlay. The bootloader
# would otherwise apply the stock kalama dtbo overlay onto our mainline
# base DTB - the phandles don't match, the merged tree is corrupt and
# the kernel panics. A no-op overlay keeps the base DTB intact. (A
# zero-entry table fails Motorola's pre-flash validation.)
mkdir -p "$pkgdir"/boot
printf '/dts-v1/;\n/plugin/;\n/ { };\n' > "$srcdir"/empty-overlay.dts
scripts/dtc/dtc -@ -O dtb -o "$srcdir"/empty.dtbo "$srcdir"/empty-overlay.dts
python3 - "$srcdir/empty.dtbo" "$pkgdir/boot/dtbo.img" <<-'EOF'
import struct, sys
fdt = open(sys.argv[1], "rb").read()
hdr_sz = ent_sz = 32
ent_off = hdr_sz + ent_sz
hdr = struct.pack(">IIIIIIII", 0xd7b7ab1e, ent_off + len(fdt),
hdr_sz, ent_sz, 1, hdr_sz, 2048, 0)
ent = struct.pack(">IIIIIIII", len(fdt), ent_off, 0, 0, 0, 0, 0, 0)
blob = hdr + ent + fdt
blob += b"\x00" * ((4096 - len(blob) % 4096) % 4096)
open(sys.argv[2], "wb").write(blob)
EOF
rm -f "$pkgdir"/usr/lib/modules/*/build "$pkgdir"/usr/lib/modules/*/source rm -f "$pkgdir"/usr/lib/modules/*/build "$pkgdir"/usr/lib/modules/*/source
install -Dm644 "$builddir"/include/config/kernel.release \ install -Dm644 "$builddir"/include/config/kernel.release \