Hi everyone.I'm trying to transfer data from DDR memory to a custom PLB_IPIFperipheral in a Virtex II Pro XUP card. I have some questions:1. In EDK is not possible to configure a scatter-gather DMA accesswith PLB in the Peripheral wizard. Why?2. I'm trying to transfer data using simple DMA under linux 2.4compiled for PPC405, but the system crash when it is inicialized theDMA transfer. Totally dead. I'm keeping in mind the differencesbetween physical and virtual addresses in source and destinyregisters, in fact i have tried with a driver for kernel. Instandalone mode the DMA transfer works fine. I'm working with EDK8.2 .I know there are many things can be wrong, but any help or suggestionis appreciated.Thank you in advance.

DMA scatter gather with PLB bus?

Sep 20, 2007 2 Replies

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cesarp 18 years ago

Hi everyone. I'm trying to transfer data from DDR memory to a custom PLB_IPIF peripheral in a Virtex II Pro XUP card. I have some questions:

In EDK is not possible to configure a scatter-gather DMA access with PLB in the Peripheral wizard. Why?
I'm trying to transfer data using simple DMA under linux 2.4 compiled for PPC405, but the system crash when it is inicialized the DMA transfer. Totally dead. I'm keeping in mind the differences between physical and virtual addresses in source and destiny registers, in fact i have tried with a driver for kernel. In standalone mode the DMA transfer works fine. I'm working with EDK

8.2 .

I know there are many things can be wrong, but any help or suggestion is appreciated.

Thank you in advance.

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Jeff Cunningham 18 years ago

Do you have access to chipscope and some spare block rams? With that you could trace what the PLB is doing when it dies.

-Jeff

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cesarp 18 years ago

I'm trying it. i hope there are ram enough. Thanks!

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