Keil C does not support this line:
typedef const UINT32 volatile xdata *PCVX32;
typedef const volatile UINT32 xdata *PCVX32;
"For two qualified types to be compatible, both shall have the identically qualified version of a compatible type; the order of type qualifiers within a list of specifiers or qualifiers does not affect the specified type." from ISO/IEC 9899:1999 And I can not find more.