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怎样在OMAP4460的DMA link-list的descriptor中标记是最后一个descriptor

Other Parts Discussed in Thread: DM3730

OMAP4460的DMA link-list的最后一个descriptor怎么标记呢?

在手册中16.4.20.2中写道  “The end of the super block is signaled in the last descriptor associated with the last block”,但是没有提到到底怎样去标记的。

我试了一下将next-descriptor pointeraddress设为0,但是这样不行,并会报出“DMA misaligned error with device XX”。

烦请大侠指点,怎样能在descriptor中标记这是最后一个descriptor呢?多谢!!