Makefile: add platform-specific default mass-storage-gadget directory

Move the default mass-storage-gadget64 directory path from a hardcoded
value in main.c to a build-time configurable variable in the Makefile.
On Windows, this defaults to the standard installation path used by the
Windows installer. On Unix systems, the behavior remains unchanged.

This allows rpiboot to be invoked without the -d parameter on Windows.

Fixes: #342

Signed-off-by: Nicolai Buchwitz <[email protected]>

Author: nbuchwitz

Makefile

@@ -3,9 +3,14 @@ PKG_VER=$(shell if [ -f debian/changelog ]; then grep rpiboot debian/changelog |
 GIT_VER=$(shell git rev-parse HEAD 2>/dev/null | cut -c1-8 || echo "")
 HAVE_XXD=$(shell xxd -v >/dev/null 2>/dev/null && echo y)
 INSTALL_PREFIX?=/usr
+ifeq ($(OS),Windows_NT)
+    DEFAULT_MSG_DIR ?= "C:/Program Files (x86)/Raspberry Pi/mass-storage-gadget64/"
+else
+    DEFAULT_MSG_DIR ?= $(INSTALL_PREFIX)/share/rpiboot/mass-storage-gadget64/
+endif
 
 rpiboot: main.c bootfiles.c decode_duid.c msd/bootcode.h msd/start.h msd/bootcode4.h
-	$(CC) -Wall -Wextra -g $(CPPFLAGS) $(CFLAGS) -o $@ main.c bootfiles.c decode_duid.c `pkg-config --cflags --libs libusb-1.0` -DGIT_VER="\"$(GIT_VER)\"" -DPKG_VER="\"$(PKG_VER)\"" -DBUILD_DATE="\"$(BUILD_DATE)\"" -DINSTALL_PREFIX=\"$(INSTALL_PREFIX)\" $(LDFLAGS)
+	$(CC) -Wall -Wextra -g $(CPPFLAGS) $(CFLAGS) -o $@ main.c bootfiles.c decode_duid.c `pkg-config --cflags --libs libusb-1.0` -DGIT_VER="\"$(GIT_VER)\"" -DPKG_VER="\"$(PKG_VER)\"" -DBUILD_DATE="\"$(BUILD_DATE)\"" -DDEFAULT_MSG_DIR=\"$(DEFAULT_MSG_DIR)\" $(LDFLAGS)
 
 ifeq ($(HAVE_XXD),y)
 %.h: %.bin

main.c

@@ -296,7 +296,7 @@ libusb_device_handle * LIBUSB_CALL open_device_with_vid(
 					second_stage = "bootcode.bin";
 
 				if ((bcm2711 || bcm2712) && !directory) {
-					directory = INSTALL_PREFIX "/share/rpiboot/mass-storage-gadget64/";
+					directory = DEFAULT_MSG_DIR;
 					use_bootfiles = 1;
 					snprintf(bootfiles_path, sizeof(bootfiles_path),"%s%s", directory, "bootfiles.bin");
 					printf("Directory not specified - trying default %s\n", directory);