Looks like this is broken recently. I cloned the tree at the top commit been, e73d481c4add17ee953c80bb4be72372d90d93d3 ppc/uImage: Add support for RAM Disks Then, error out. kexec/arch/i386/x86-linux-setup.c: In function ?setup_linux_system_parameters?: kexec/arch/i386/x86-linux-setup.c:511:9: error: ?kexec_flags? undeclared (first use in this function) kexec/arch/i386/x86-linux-setup.c:511:9: note: each undeclared identifier is reported only once for each function it appears in make: *** [kexec/arch/i386/x86-linux-setup.o] Error 1 CAI Qian