direct.s

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * arch/ppc/boot/simple/direct.S
 *
 * Author: Tom Rini <[e-mail]>
 *
 * This is an empty function for machines which use SERIAL_IO_MEM
 * and don't need ISA_io set to anything but 0, or perform any other
 * serial fixups.
 */

	.text

	.globl serial_fixups
serial_fixups:
	blr