build/roms: simplified seagrub handling

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/grub/bootorder

@@ -0,0 +1 @@
+/rom@img/grub2

script/build/roms

@@ -399,8 +399,12 @@ build_grub_roms()
 			newrom="${newrom}${initmode}_${keymap}.rom"
 		x_ moverom "${tmpgrubrom}" "${newrom}"
 		if [ "${payload_seabios_grubonly}" = "y" ]; then
-			mkSeagrubRom "${tmpgrubrom}" "${newrom}"
-			mkSeabiosGrubonlyRom "${tmpgrubrom}" "${newrom}"
+			x_ "$cbfstool" "$tmpgrubrom" add \
+			    -f "config/grub/bootorder" -n bootorder -t raw
+			x_ moverom "$tmpgrubrom" "${newrom%.rom}_grubfirst.rom"
+			x_ "$cbfstool" "$tmpgrubrom" add-int -i 0 \
+			    -n etc/show-boot-menu
+			x_ moverom "$tmpgrubrom" "${newrom%.rom}_grubonly.rom"
 		fi
 		x_ rm -f "${tmpgrubrom}"
 	done
@@ -429,34 +433,6 @@ mkSeabiosRom() {
 	printf "%s\n" "${tmprom}"
 }
 
-# SeaGRUB configuration
-mkSeagrubRom()
-{
-	_grubrom="${1}"
-	_newrom="${2}"
-
-	tmpbootorder=$(mktemp -t coreboot_rom.XXXXXXXXXX)
-
-	# only load grub, by inserting a custom bootorder file
-	printf "/rom@img/grub2\n" > "$tmpbootorder" || $err "printf bootorder"
-	x_ "${cbfstool}" "${_grubrom}" \
-	    add -f "${tmpbootorder}" -n bootorder -t raw
-	x_ rm -f "${tmpbootorder}"
-
-	x_ moverom "${_grubrom}" "${_newrom%.rom}_grubfirst.rom"
-}
-
-# SeaGRUB, and disable the SeaBIOS menu (grub only)
-mkSeabiosGrubonlyRom()
-{
-	_grubrom="${1}"
-	_newrom="${2}"
-
-	x_ "${cbfstool}" "${_grubrom}" add-int -i 0 -n etc/show-boot-menu
-
-	x_ moverom "${_grubrom}" "${_newrom%.rom}_grubonly.rom"
-}
-
 build_uboot_roms()
 {
 	tmprom=$(mkUbootRom "${cbrom}" "fallback/payload") || \