x86: use sysfs DMI information to populate sysinfo

Use the DMI data available in sysfs to extract manufacturer and model info
and write it to /tmp/sysinfo/.

The data will be picked up by board_detect and can be used by e.g. LuCI to
display a more appropriate model description.

On an APU board the files will contain the following values:

    # cat /tmp/sysinfo/model
    PC Engines APU

    # cat /tmp/sysinfo/board_name
    pc-engines-apu

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

target/linux/x86/base-files/lib/preinit/20_sysinfo

@@ -0,0 +1,28 @@
+do_sysinfo_x86() {
+	local vendor product file
+
+	for file in sys_vendor board_vendor; do
+		vendor="$(cat /sys/devices/virtual/dmi/id/$file 2>/dev/null)"
+		[ -n "$vendor" ] && break
+	done
+
+	for file in product_name board_name; do
+		product="$(cat /sys/devices/virtual/dmi/id/$file 2>/dev/null)"
+		[ -n "$product" ] && break
+	done
+
+	[ -n "$vendor" -a -n "$product" ] || return
+
+	mkdir -p /tmp/sysinfo
+
+	echo "$vendor $product" > /tmp/sysinfo/model
+
+	sed -e '
+		y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/;
+		s/[^a-z0-9_-]\+/-/g;
+		s/^-//;
+		s/-$//;
+	' /tmp/sysinfo/model > /tmp/sysinfo/board_name
+}
+
+boot_hook_add preinit_main do_sysinfo_x86