boot/syslinux: add option to install c32 modules

[Peter: reworded comment slightly]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/syslinux/Config.in

@@ -46,4 +46,14 @@ config BR2_TARGET_SYSLINUX_EFI
 
 endchoice
 
+if BR2_TARGET_SYSLINUX_LEGACY_BIOS
+
+config BR2_TARGET_SYSLINUX_C32
+	string "modules to install"
+	help
+	  Enter a space-separated list of .c32 modules to install.
+	  Leave empty to install no module.
+
+endif # BR2_TARGET_SYSLINUX_LEGACY_BIOS
+
 endif # BR2_TARGET_SYSLINUX

boot/syslinux/syslinux.mk

@@ -63,10 +63,19 @@ SYSLINUX_IMAGES-$(BR2_TARGET_SYSLINUX_PXELINUX) += bios/core/pxelinux.bin
 SYSLINUX_IMAGES-$(BR2_TARGET_SYSLINUX_MBR) += bios/mbr/mbr.bin
 SYSLINUX_IMAGES-$(BR2_TARGET_SYSLINUX_EFI) += $(SYSLINUX_EFI_BITS)/efi/syslinux.efi
 
+SYSLINUX_C32 = $(call qstrip,$(BR2_TARGET_SYSLINUX_C32))
+
+# We install the c32 modules from the host-installed tree, where they
+# are all neatly installed in a single location, while they are
+# scattered around everywhere in the build tree.
 define SYSLINUX_INSTALL_IMAGES_CMDS
 	for i in $(SYSLINUX_IMAGES-y); do \
 		$(INSTALL) -D -m 0755 $(@D)/$$i $(BINARIES_DIR)/$${i##*/}; \
 	done
+	for i in $(SYSLINUX_C32); do \
+		$(INSTALL) -D -m 0755 $(HOST_DIR)/usr/share/syslinux/$${i} \
+				   $(BINARIES_DIR)/$${i}; \
+	done
 endef
 
 $(eval $(generic-package))