Update readme and improve makefile

Author: DC-SWAT

Makefile

@@ -0,0 +1,12 @@
+# Root Makefile for FatFs
+# Delegates all commands to the actual Makefile in the fatfs directory
+
+.PHONY: all
+
+# Default target
+all:
+	$(MAKE) -C fatfs
+
+# Pass all targets to fatfs/Makefile
+%:
+	$(MAKE) -C fatfs $@ 

README.md

@@ -15,13 +15,30 @@ cp -R include fatfs /opt/toolchains/dc/kos/addons
 make
 ```
 
+### Build Options
+You can customize the build with the following options:
+- `DEBUG=1` - Enable debug output (disabled by default)
+- `DMA_BUF=0` - Disable DMA buffer (enabled by default)
+- `SD_CHECK_CRC=1` - Enable CRC checking for SD cards (disabled by default)
+
+Examples:
+```console
+# Build with defaults
+make
+
+# Build with CRC checking for SD cards
+make SD_CHECK_CRC=1
+
+# Build without DMA buffer
+make DMA_BUF=0
+```
+
 ## Usage
 - Add `#include <fatfs.h>` in your C source file.
 - Add `-lfatfs` in your `Makefile` on the line which builds your program, e.g.:
   - `kos-cc -o $(TARGET) $(OBJS) -lfatfs`
 - Simply call `fs_fat_mount_sd()` to mount a FAT partition to `/sd` and/or call `fs_fat_mount_ide()` to mount a FAT partition to `/ide`.
 - Additionally, you can use other block devices by calling `fs_fat_mount()` with the appropriate parameters for the target device -- see `fatfs.h` for more information.
-- To reduce memory usage you can disable DMA buffer, look in `Makefile`.
 
 ## Links
 - DreamShell: https://github.com/DC-SWAT/DreamShell

fatfs/Makefile

@@ -1,22 +1,34 @@
-# KallistiOS ##version##
-#
-# libfatfs Makefile
-# (C) 2025 Ruslan Rostovtsev
-#
-
-TARGET = libfatfs.a
-OBJS = src/option/ccsbcs.o \
-		src/option/syscall.o \
-		src/ff.o \
-		src/dc.o \
-		src/dc_bdev.o
-
-KOS_CFLAGS += -W -Wextra -pedantic -Isrc -I../include
-
-# Uncomment to enable debug output.
-# KOS_CFLAGS += -DFATFS_DEBUG=1
-
-# Comment out to reduce memory usage.
-KOS_CFLAGS += -DFATFS_USE_DMA_BUF=1
-
-include $(KOS_BASE)/addons/Makefile.prefab
+# KallistiOS ##version##
+#
+# libfatfs Makefile
+# (C) 2025 Ruslan Rostovtsev
+#
+
+TARGET = libfatfs.a
+OBJS = src/option/ccsbcs.o \
+		src/option/syscall.o \
+		src/ff.o \
+		src/dc.o \
+		src/dc_bdev.o
+
+KOS_CFLAGS += -W -Wextra -pedantic -Isrc -I../include
+
+# Enable debug output if DEBUG=1
+ifdef DEBUG
+    KOS_CFLAGS += -DFATFS_DEBUG=1
+endif
+
+# Enable DMA buffer unless DMA_BUF=0
+ifndef DMA_BUF
+    DMA_BUF = 1
+endif
+ifeq ($(DMA_BUF), 1)
+    KOS_CFLAGS += -DFATFS_USE_DMA_BUF=1
+endif
+
+# Enable CRC checking for SD cards if SD_CHECK_CRC=1
+ifdef SD_CHECK_CRC
+    KOS_CFLAGS += -DFATFS_SD_CHECK_CRC=1
+endif
+
+include $(KOS_BASE)/addons/Makefile.prefab