On 9 September 2013 15:51, Marcel Apfelbaum <marce...@redhat.com> wrote: > On Mon, 2013-09-09 at 15:21 +0100, Peter Maydell wrote: >> No, it's perfectly possible for a bus master transaction >> to abort. The PC's host controller happens to be set up so >> that bus master DMA covers the whole of the PCI memory space >> and so it's probably not possible to get an abort on that >> platform, but this isn't necessarily the case. For instance >> the versatilePB's PCI controller only responds to accesses >> within its programmed MMIO BAR ranges, so if the device >> or the controller have been misconfigured you can get an >> abort when the device tries to do DMA. (This usually causes >> the device to decide something has gone seriously wrong. > Thanks, I am not familiar with versatilePB, I may be able > to code it, I don't know how to test it
Don't worry about testing versatilePB particularly; you just need to make sure your code can cope with master aborts by device initiated transactions. -- PMM
