topic PCIe DMA problems with i.MX6 in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/PCIe-DMA-problems-with-i-MX6/m-p/251873#M23201 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have built a driver, which in the past has successfully been used on an xscale system, as well as x86 systems. The driver installs without any problems and I can view it with lsmod, and can see the hardware which is behind a PLX PCIe -&gt; mPCI bridge with lspci.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>There is a dma problem, which I can't get to the bottom of. I have obtained the errors from dmesg which I have attached.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Firstly can the PCIe interface be used with DMA?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Where can I find information about the memory range supported by the DMA controller so that I can modify the driver to support the correct DMA address range?</P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">The driver has been built to use a bounce buffer.</SPAN></P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">Kind regards</SPAN></P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">Andrew<BR /></SPAN></P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-336085">soloerror.log.zip</A></STRONG></P></BODY></HTML> Thu, 04 Apr 2013 14:53:49 GMT andrewellis 2013-04-04T14:53:49Z PCIe DMA problems with i.MX6 https://community.nxp.com/t5/i-MX-Processors/PCIe-DMA-problems-with-i-MX6/m-p/251873#M23201 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have built a driver, which in the past has successfully been used on an xscale system, as well as x86 systems. The driver installs without any problems and I can view it with lsmod, and can see the hardware which is behind a PLX PCIe -&gt; mPCI bridge with lspci.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>There is a dma problem, which I can't get to the bottom of. I have obtained the errors from dmesg which I have attached.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Firstly can the PCIe interface be used with DMA?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Where can I find information about the memory range supported by the DMA controller so that I can modify the driver to support the correct DMA address range?</P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">The driver has been built to use a bounce buffer.</SPAN></P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">Kind regards</SPAN></P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P><P><SPAN class="mce_paste_marker">Andrew<BR /></SPAN></P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-336085">soloerror.log.zip</A></STRONG></P></BODY></HTML> Thu, 04 Apr 2013 14:53:49 GMT https://community.nxp.com/t5/i-MX-Processors/PCIe-DMA-problems-with-i-MX6/m-p/251873#M23201 andrewellis 2013-04-04T14:53:49Z Re: PCIe DMA problems with i.MX6 https://community.nxp.com/t5/i-MX-Processors/PCIe-DMA-problems-with-i-MX6/m-p/251874#M23202 <HTML><HEAD></HEAD><BODY><P class="j-post-avatar" style="font-style: inherit; font-family: inherit;"><SPAN class="j-status-levels" style="font-style: inherit; font-family: inherit;"><IMG alt="Employee" class="jiveImage" src="https://community-cache.freescale.com/5.0.3/resources/images/status/FS_EMP_40x18.png" style="font-style: inherit; font-family: inherit;" title="Employee" /></SPAN></P><P><SPAN class="j-post-author" style="font-style: inherit; font-size: 0.9em; font-family: inherit;"><STRONG style="font-style: inherit; font-family: inherit;"><A href="https://community.nxp.com/people/FrankLi1z">FrankLi1z</A> </STRONG>Apr 9, 2013 7:36 PM <SPAN class="font-color-meta-light j-thread-replyto" style="padding: 0 0 0 3px; font-style: inherit; font-family: inherit; color: #a9a9a9;">(<A _jive_internal="true" class="font-color-meta-light localScroll" href="https://community.nxp.com/thread/306053#323145" style="font-style: inherit; font-family: inherit; color: #a9a9a9;" title="Go to message">in response to imxcommunityscout</A>)</SPAN></SPAN><SPAN class="j-ui-elem j-dotted-star" style="font-style: inherit; font-family: inherit; background-position: no-repeat no-repeat;"></SPAN></P><P style="font-style: inherit; font-family: inherit;">Only ARM and IPU can access PCIe space.&nbsp; The other bus master can't access PCIe space.</P><P><SPAN class="mce_paste_marker"></SPAN></P></BODY></HTML> Fri, 19 Apr 2013 17:12:02 GMT https://community.nxp.com/t5/i-MX-Processors/PCIe-DMA-problems-with-i-MX6/m-p/251874#M23202 karina_valencia 2013-04-19T17:12:02Z