diff --git a/VKernel/Kernel/main.vp b/VKernel/Kernel/main.vp
index 9094275..ca83fe0 100644
--- a/VKernel/Kernel/main.vp
+++ b/VKernel/Kernel/main.vp
@@ -315,10 +315,12 @@ class ViperKernel:
         VGA_drv = vga._VGAScreenDriver(fb, width, height, pitch, fb_format)
         self.VGA = &VGA_drv
         self.VGA.Print(100, 100, "ViperOS VKernel Test")
+        _WhProbe("post_vga", uint32(fb), pitch)
         serial.puts("你好\n")
 
         serial.puts("[main] starting desktop\n")
         _WhProbe("pre_desktop", width, height)
+        _WhProbe("pre_start", uint32(fb), pitch)
         mm.DumpBuddy()
         desktop.start(fb, width, height, pitch)
         serial.puts("[main] desktop started\n")