uboot: initial feature

features.in/uboot/README

+Настраивает систему для использования загрузчика uboot.

features.in/uboot/config.mk

+use/uboot: use/kernel
+	@$(call add_feature)
+	@$(call add,THE_LISTS,singleboard-tools)

features.in/uboot/image-scripts.d/00-uboot-prepare

+#!/bin/sh
+
+[ "$GLOBAL_BASE_BOOTLOADER" = 'uboot' ] || exit 0
+
+# installkernel relies on existing extlinux.conf
+# with filled in `default' label
+mkdir -p /boot/extlinux
+cat > /boot/extlinux/extlinux.conf << EOF
+menu title ALTLinux Boot Options
+
+default linux
+timeout 20
+
+label linux
+	kernel /boot/vmlinuz
+	initrd /boot/initrd.img
+	fdtdir /boot/dtb
+	append root=LABEL=ROOT ro cma=192M console=tty1
+EOF

features.in/uboot/image-scripts.d/90-uboot-config-install

+#!/bin/sh -x
+
+kver="$(rpm -qa 'kernel-image*' \
+            --qf '%{installtime} %{version}-%{name}-%{release}\n' \
+        | sort -n \
+        | cut -f 2 -d ' ' \
+        | sed 's/kernel-image-//')"
+
+[ -n "$kver" ] || { echo "** unable to deduce kernel version" >&2; exit 1; }
+
+/sbin/installkernel --uboot --keep-initrd "$kver"
+printf 'LABEL=ROOT\t/\text4\tdefaults\t1 1\n' >> /etc/fstab