UEFI Boot support (#84)

* EFI bootloader files need to be in /EFI/Boot in order to be portable

* EFI bootloader files need to be in /EFI/Boot on portable media to get picked up, I've retained the mixture of line endings in these files as requested (https://github.com/Tomas-M/linux-live/pull/84#issuecomment-623150025)

* Again, these files need to be in /EFI/Boot to be portable

* There will be an EFI structure under boot that is consistent with what EFI requires. Additionally, the syslinux build for EFI doesn't support the vesamenu properly at currently so we have to use the non-vesa menu

* EFI executables from syslinux 6.03

* to support the VESA menu we need additional files

* These are the syslinux 6.04pre-1 files that support vesamenu on EFI. All other builds are broken and all the post pre-1 builds are known to be unreliable according to the syslinux mailing list

Slax/debian10/bootfiles/bootinst.bat

@@ -54,14 +54,19 @@ goto setup95
 
 :setupNT
 \slax\boot\syslinux.exe -maf -d /slax/boot/ %DISK%:
-if %ERRORLEVEL% == 0 goto setupDone
+if %ERRORLEVEL% == 0 goto setupEFI
 goto errorFound
 
 :setup95
 \slax\boot\syslinux.com -maf -d /slax/boot/ %DISK%:
-if %ERRORLEVEL% == 0 goto setupDone
+if %ERRORLEVEL% == 0 goto setupEFI
 goto errorFound
 
+:setupEFI
+mkdir %DISK%:\EFI\Boot
+copy \slax\boot\EFI\Boot\* %DISK%:\EFI\Boot
+goto setupDone
+
 :setupDone
 echo Installation finished.
 goto pauseit

Slax/debian10/bootfiles/bootinst.sh

@@ -148,6 +148,10 @@ if [ "$DEV" != "$PART" ]; then
    ) | fdisk $DEV >/dev/null 2>&1
 fi
 
+# UEFI boot loader
+mkdir -p "$BOOT/../../EFI"
+mv "EFI/Boot" "$BOOT/../../EFI/"
+
 echo "Boot installation finished."
 echo "Press Enter..."
 read junk

Slax/debian9/bootfiles/bootinst.bat

@@ -54,14 +54,19 @@ goto setup95
 
 :setupNT
 \slax\boot\syslinux.exe -maf -d /slax/boot/ %DISK%:
-if %ERRORLEVEL% == 0 goto setupDone
+if %ERRORLEVEL% == 0 goto setupEFI
 goto errorFound
 
 :setup95
 \slax\boot\syslinux.com -maf -d /slax/boot/ %DISK%:
-if %ERRORLEVEL% == 0 goto setupDone
+if %ERRORLEVEL% == 0 goto setupEFI
 goto errorFound
 
+:setupEFI
+mkdir %DISK%:\EFI\Boot
+copy \slax\boot\EFI\Boot\* %DISK%:\EFI\Boot
+goto setupDone
+
 :setupDone
 echo Installation finished.
 goto pauseit

Slax/debian9/bootfiles/bootinst.sh

@@ -148,6 +148,10 @@ if [ "$DEV" != "$PART" ]; then
    ) | fdisk $DEV >/dev/null 2>&1
 fi
 
+# UEFI boot loader
+mkdir -p "$BOOT/../../EFI"
+mv "EFI/Boot" "$BOOT/../../EFI/"
+
 echo "Boot installation finished."
 echo "Press Enter..."
 read junk

bootfiles/bootinst.bat

@@ -24,10 +24,16 @@ goto setup95
 
 :setupNT
 \boot\syslinux.exe -maf -d /boot/ %DISK%:
-goto setupDone
+goto setupEFI
 
 :setup95
 \boot\syslinux.com -maf -d /boot/ %DISK%:
+goto setupEFI
+
+:setupEFI
+mkdir %DISK%:\EFI\Boot
+copy \boot\EFI\Boot\* %DISK%:\EFI\Boot
+goto setupDone
 
 :setupDone
 echo Installation finished.

bootfiles/bootinst.sh

@@ -40,5 +40,9 @@ if [ "$DEV" != "$PART" ]; then
    ) | fdisk $DEV >/dev/null 2>&1
 fi
 
+# UEFI boot loader
+mkdir -p "$BOOT/../../EFI"
+mv "EFI/Boot" "$BOOT/../../EFI/"
+
 echo "Boot installation finished."
 cd "$CWD"

build

@@ -49,11 +49,18 @@ if [ "$INITRAMFS" != "" ]; then
    mv "$INITRAMFS" $BOOT/initrfs.img
 fi
 
-cp bootfiles/* $BOOT
+# BIOS / MBR booting
+cp -r bootfiles/* $BOOT
 cat bootfiles/syslinux.cfg | sed -r "s:/boot/:/$LIVEKITNAME/boot/:" > $BOOT/syslinux.cfg
 cat bootfiles/bootinst.bat | sed -r "s:/boot/:/$LIVEKITNAME/boot/:" | sed -r "s:\\\\boot\\\\:\\\\$LIVEKITNAME\\\\boot\\\\:" > $BOOT/bootinst.bat
 cp $VMLINUZ $BOOT/ || exit
 
+# UEFI booting
+mkdir -p $BOOT/EFI/Boot
+cp bootfiles/EFI/Boot/syslinux.efi $BOOT/EFI/Boot/bootx64.efi
+cp bootfiles/EFI/Boot/{ldlinux.e64,menu.c32,libutil.c32,vesamenu.c32,libcom32.c32} $BOOT/EFI/Boot
+cat $BOOT/syslinux.cfg | sed -r "s:/$LIVEKITNAME/boot/vesamenu:vesamenu:" > $BOOT/EFI/Boot/syslinux.cfg
+
 # create compressed 01-core.sb
 COREFS=""
 for i in $MKMOD; do