mipsel-mitx: initial feature for tavolga support

...with xorg-drv-btsm750 and packaged xorg.conf.

features.in/mipsel-mitx/config.mk

@@ -0,0 +1,4 @@
+use/mipsel-mitx: use/kernel
+	@$(call add_feature)
+	@$(call set,KFLAVOURS,mitx-def)
+	@$(call add,THE_PACKAGES,xorg-conf-sm750-tavolga)

features.in/mipsel-mitx/rootfs/image-scripts.d/40-boot

@@ -0,0 +1,34 @@
+#!/bin/sh -efu
+
+mkdir -p /boot
+
+vmlinuz="$(find /boot -type f -name 'vmlinuz-*')"
+kversion="${vmlinuz##/boot/vmlinuz-}"
+
+DTB_NAME=
+# grep 'load-.*0xffffffff' arch/mips/baikal/Platform
+KERNEL_LOAD_ADDR=
+case "$kversion" in
+	3.19*)
+		DTB_NAME=tplatforms_mitx2
+		KERNEL_LOAD_ADDR=0x80004000
+		;;
+	*)
+		# 4.4, 4.9
+		DTB_NAME=baikal_mitx
+		KERNEL_LOAD_ADDR=0x80100000
+		;;
+esac
+
+[ -n "$DTB_NAME" ]
+[ -n "$KERNEL_LOAD_ADDR" ]
+
+cp /lib/devicetree/"$kversion/$DTB_NAME".dtb /boot/"$DTB_NAME"-"$kversion".dtb
+ln -s "$DTB_NAME"-"$kversion".dtb /boot/$DTB_NAME.dtb
+
+cat > /boot/bootconf << EOF
+default: bootconf0
+bootconf0 vmlinuz $KERNEL_LOAD_ADDR $KERNEL_LOAD_ADDR $DTB_NAME.dtb initrd.img root=UUID=@ROOTUUID@ rw rootwait earlyprintk=uart8520,mmio32,0x1f04a000,115200 maxcpus=2 consoleblank=0 console=tty1 console=ttyS0,115200n8 video=sm750fb:1920x1080-32@60 nohtw nocoherentio ieee754=relaxed
+EOF
+
+exit 0