Show something on the framebuffer on unsupported type, so that we can know something is going on

kernel/src/render/Framebuffer.cpp

@@ -3,6 +3,8 @@
 #include "render/Framebuffer.h"
 #include "assert.h"
 #include "bootboot.h"
+#include "panic/Panic.h"
+#include "string.h"
 
 Framebuffer framebuffer0;
 
@@ -13,7 +15,11 @@ void Framebuffer::init(void* fb_address, int fb_type, int fb_scanline, int fb_wi
     m_fb_width = fb_width;
     m_fb_scanline = fb_scanline;
     m_fb_type = fb_type;
-    ASSERT(m_fb_type == FB_ARGB); // FIXME: support more framebuffer types
+    if (m_fb_type != FB_ARGB)
+    {
+        memset(m_fb_address, 0xe4, 500); // make it visible
+        panic("unsupported framebuffer");
+    }
 }
 
 void Framebuffer::set_pixel(uint32_t x, uint32_t y, Color color)