Add default config for grub2.

install/1merge/grub/default.grub

@@ -0,0 +1,17 @@
+# Calculate format=openrc path=/etc/default name=grub
+GRUB_DISABLE_RECOVERY=true
+GRUB_DEFAULT=saved
+GRUB_TIMEOUT=3
+GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 udev quiet doscsi"
+GRUB_CMDLINE_LINUX="video=uvesafb:ywrap,#-os_install_fb_resolution-#,mtrr:3,splash=silent,theme:tty1 #-os_install_kernel_resume-# elevator=#-os_install_kernel_scheduler-# doscsi#-os_install_kernel_attr-# calculate=video:#-os_install_x11_video_drv-#"
+GRUB_TERMINAL="gfxterm"
+GRUB_GFXMODE="auto"
+GRUB_BACKGROUND="/boot/grub/calculate-grub.png"
+GRUB_COLOR_NORMAL="white/black" 
+GRUB_COLOR_HIGHLIGHT="magenta/black"
+#?os_install_linux_subname==#
+GRUB_DISTRIBUTOR="#-os_install_linux_name-#"
+#os_install_linux_subname#
+#?os_install_linux_subname!=#
+GRUB_DISTRIBUTOR="#-os_install_linux_name-# #-os_install_linux_subname-#"
+#os_install_linux_subname#