关于internal,external interrupt 的概念 for MPC85XX

pigmeat

通常internal interrupt是用于定义那些程序执行相关的内部异常。为什么powerpc的内部中断包含了很多关于硬件接口类似于外部的中断，
那么外部中断又主要上报什么样的中断呢？

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Powerpc
external interrupt 有12个引脚
internal 有48个，包含了
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Internal Interrupt
Number Interrupt Source
Internal Interrupt
Number Interrupt Source
0 L2 cache 24 eTSEC2 error
1 ECM 25 Reserved
2 DDR DRAM 26 DUART
3 LBC 27 I2C controllers
4 DMA channel 0 28 Performance monitor
5 DMA channel 1 29 Security channel
6 DMA channel 2 30 Reserved
7 DMA channel 3 31 Unused
8 PCI1 32 Serial RapidIO error/write-port unit
9 PCI2 33 Serial RapidIO outbound doorbell
10 PCI Express 34 Serial RapidIO inbound doorbell
11 Reserved 35 Reserved
12 Reserved 36 Reserved
13 eTSEC1 transmit 37 Serial RapidIO outbound message unit 0
.... ....