Added basic hammerhead config (NOT tested)

device-lg-hammerhead/APKBUILD

+pkgname=device-lg-hammerhead
+pkgver=1
+pkgrel=1
+pkgdesc="Google Nexus 5"
+url="https://github.com/postmarketOS"
+arch="noarch"
+license="FIXME"
+depends="linux-lg-hammerhead"
+makedepends=""
+install=""
+subpackages=""
+source="deviceinfo"
+options="!check"
+
+build() {
+	return 0
+}
+
+package() {
+	install -D -m644 "$srcdir"/deviceinfo \
+		"$pkgdir"/etc/deviceinfo
+}
+
+sha512sums="180b1cab6b0ed8c1448a1582dbb6081c81aa598bd923449293d8e41eb0dd245c92cea9b5bd30ce59009ce60801881952e9ac3a3ec6e971a894e24e22d42dee52  deviceinfo"

device-lg-hammerhead/deviceinfo

+# This document format is a draft.
+# You can source it in shell scripts.
+# Use only double quotes.
+
+deviceinfo_format_version="0"
+deviceinfo_name="Google Nexus 5"
+deviceinfo_manufacturer="LG"
+deviceinfo_date=""
+deviceinfo_keyboard="false"
+deviceinfo_nonfree="????"
+deviceinfo_dtb=""
+deviceinfo_modules=""
+deviceinfo_modules_initfs=""
+deviceinfo_external_disk="false"
+deviceinfo_external_disk_install="false"
+deviceinfo_flash_methods="fastboot"
+deviceinfo_arch="armhf"
+
+
+# You can for example extract these from an existing boot.img
+deviceinfo_flash_offset_base="0"
+deviceinfo_flash_offset_kernel="0x00008000"
+deviceinfo_flash_offset_ramdisk="0x02900000"
+deviceinfo_flash_offset_second=""
+deviceinfo_flash_offset_tags="0x02700000"
+deviceinfo_flash_pagesize="2048"