Add some explanation to the multi_core todo

Cargo.toml

@@ -50,10 +50,12 @@ sbi-rt = "0.0.3"
 default = [
   "acpi",
   #TODO: issues with Alder Lake and newer CPUs: "multi_core",
+  # This may be because of mismatch between cpu id and apic id
   "graphical_debug",
   "serial_debug",
   "self_modifying",
   "x86_kvm_pv",
+  #"syscall_debug"
 ]
 
 # Activates some limited code-overwriting optimizations, based on CPU features.
@@ -86,6 +88,6 @@ panic = "abort"
 # Avoids having to define the eh_personality lang item and reduces kernel size
 panic = "abort"
 
-lto = true
+#lto = true
 
 debug = "full"