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README.md

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+# R36 Ultra Framebuffer Demo - ARM64 Build
+
+## ✅ Successfully Compiled for ARM64!
+
+The program has been cross-compiled for ARM64 (aarch64) architecture.
+
+## Files
+
+- **`framebuffer_simple.c`** - Pure C implementation (no dependencies)
+- **`framebuffer_demo.vala`** - Vala implementation (requires GLib)
+- **`framebuffer_demo`** - ARM64 binary (statically linked, ready to run)
+- **`compile_simple.sh`** - Compilation script for C version
+
+## Binary Information
+
+```
+framebuffer_demo: ELF 64-bit LSB executable, ARM aarch64, statically linked
+```
+
+This binary is:
+- ✅ Compiled for ARM64 (R36 Ultra architecture)
+- ✅ Statically linked (no dependencies needed)
+- ✅ Ready to transfer and run on R36 Ultra
+
+## Transfer to R36 Ultra
+
+### Option 1: SCP (Network Transfer)
+```bash
+scp framebuffer_demo user@r36ultra-ip:/home/user/
+```
+
+### Option 2: USB/SD Card
+1. Copy `framebuffer_demo` to USB drive or SD card
+2. Insert into R36 Ultra
+3. Copy to device
+
+## Running on R36 Ultra
+
+```bash
+chmod +x framebuffer_demo
+sudo ./framebuffer_demo
+```
+
+## What It Does
+
+The program:
+1. Opens `/dev/fb0` framebuffer (720x720, BGRA format)
+2. Draws colorful shapes:
+   - Red rectangle
+   - Green circle
+   - Blue rectangle
+   - Yellow circle
+3. Waits for Enter key
+4. Clears screen and exits
+
+## Recompiling
+
+### For ARM64 (cross-compile):
+```bash
+./compile_simple.sh arm64
+```
+
+### For native (x86_64):
+```bash
+./compile_simple.sh
+```
+
+## Customization
+
+Edit `framebuffer_simple.c` and use these functions:
+
+- `fill_screen(fb, b, g, r, a)` - Fill screen with color
+- `set_pixel(fb, x, y, b, g, r, a)` - Set individual pixel
+- `draw_rectangle(fb, x, y, w, h, b, g, r, a)` - Draw rectangle
+- `draw_circle(fb, cx, cy, radius, b, g, r, a)` - Draw circle
+- `fb_update(fb)` - Write to framebuffer
+
+**Note**: Colors are in BGRA format (Blue, Green, Red, Alpha)
+
+## Advantages of C Version
+
+- ✅ No dependencies (pure C, statically linked)
+- ✅ Easy cross-compilation
+- ✅ Small binary size
+- ✅ Fast execution
+- ✅ Works on any ARM64 Linux system