说明：  powerpc 8270、8280等系列芯片手册，讲述了芯片PCI,SPI,I2C等总线、内部寄存器、中断模式、启动状态等等各种设置。
(The powerpc 8270,8280 series datasheets, about the chip, PCI, SPI, I2C bus, the internal registers, the interrupt mode, Start state, so a variety of settings.)