Re: DMA problem in net2280?
David Brownell <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Thursday 16 August 2007, Alan Stern wrote: > Dave: > > While doing some testing today, I found that net2280 wasn't working > right. When DMA is enabled, the bulk-OUT data buffers presented to > g_file_storage contain nothing but 0x6b bytes. With DMA disabled > everything works okay, so this definitely has to be something wrong in > the controller driver. You surely know that POISON_FREE is 0x6b... Doesn't need to be the controller driver. Something else could be making trouble. > I haven't noticed any recent changes that would cause this, and in fact > I tested net2280 a few weeks ago (can't remember exactly when) with no > problems. So maybe this was caused by a change elsewhere, like in the > DMA API. Regardless, it needs to be fixed. > > Have you seen this, or can you confirm it? A quick check with usbtest/g_zero using the default pattern (all zeroes) doesn't fail ... same results with DMA and PIO. That's a slightly hacked g_zero, which I'll post in a while, but I can't see how that would have affected that. - Dave > > Alan Stern > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel