Add NVMe support to GRUB2 payload

Tested on OptiPlex 3050 (via injecting grub2.elf into WIP coreboot
port).

config/grub/config/grub.cfg

@@ -76,10 +76,20 @@ function search_grub {
 	echo -n "Attempting to load grub.cfg from '${1}' devices"
 	for i in 0 1 2 3 4 5 6 7 8 9 10 11; do
 		for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
+			if [ "${1}" != "nvme" ]; then
 				try_user_config "(${1}${i},${part})"
+			else
+				# TODO: do we care about other namesapces
+				try_user_config "(nvme${i}n1,${part})"
+			fi
 		done
+		if [ "${1}" != "nvme" ]; then
 			# raw devices e.g. (ahci0) instead of (ahci0,1)
 			try_user_config "(${1}${i})"
+		else
+			# TODO: do we care about other namesapces
+			try_user_config "(nvme${i}n1)"
+		fi
 	done
 	echo # Insert newline
 }
@@ -102,10 +112,20 @@ function search_isolinux {
 	echo "\nAttempting to parse iso/sys/extlinux config from '${1}' devices"
 	for i in 0 1 2 3 4 5 6 7 8 9 10 11; do
 		for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
+			if [ "${1}" != "nvme" ]; then
 				try_isolinux_config "(${1}${i},${part})"
+			else
+				# TODO: see above
+				try_isolinux_config "(nvme${i}n1,${part})"
+			fi
 		done
+		if [ "${1}" != "nvme" ]; then
 			# raw devices e.g. (usb0) instead of (usb0,1)
 			try_isolinux_config "(${1}${i})"
+		else
+			# TODO: do we care about other namesapces
+			try_isolinux_config "(nvme${i}n1)"
+		fi
 	done
 	echo # Insert newline
 }
@@ -125,6 +145,9 @@ menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o
 	if [ "${grub_scan_disk}" != "ahci" ]; then
 		search_bootcfg ata
 	fi
+	if [ "${grub_scan_disk}" != "nvme" ]; then
+		search_bootcfg nvme
+	fi
 
 	# grub device enumeration is very slow, so checks are hardcoded
 
@@ -143,6 +166,7 @@ menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o
 
 	unset ahcidev
 	unset atadev
+	unset nvmedev
 	for i in 11 10 9 8 7 6 5 4 3 2 1 0; do
 		for part in 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1; do
 			if [ "${grub_scan_disk}" != "ata" ]; then
@@ -151,6 +175,10 @@ menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o
 			if [ "${grub_scan_disk}" != "ahci" ]; then
 				atadev="(ata${i},${part}) ${atadev}"
 			fi
+			if [ "${grub_scan_disk}" != "nvme" ]; then
+				# TODO: do we care about other namesapces
+				nvmedev="(nvme${i}n1,${part}) ${nvmedev}"
+			fi
 		done
 	done
 
@@ -185,6 +213,9 @@ menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on AHCI  [a]' --hotkey='a'
 menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on ATA/IDE  [d]' --hotkey='d' {
 	search_bootcfg ata
 }
+menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on NVMe  [e]' --hotkey='e' {
+	search_bootcfg nvme
+}
 if [ -f (cbfsdisk)/grubtest.cfg ]; then
 menuentry 'Load test configuration (grubtest.cfg) inside of CBFS  [t]' --hotkey='t' {
 	set root='(cbfsdisk)'

config/grub/modules.list

@@ -105,6 +105,7 @@ multiboot2 \
 nativedisk \
 normal \
 ntfs \
+nvme \
 ohci \
 part_bsd \
 part_dfly \