Hello,
Officially I see this concerning certification http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.dc35889_1254/html/installsol/X22779.htm
It mentions only Solaris 8, however I am 100% sure that ASE 12.5.4 runs on Solaris 9 and I think it also runs on Solaris 10 without being certified
Regards,
Kimon