topic Re: Imx6 pcie ep DMA issue in i.MX Processors

Imx6 pcie ep DMA issue

kshitijbatra — Tue, 02 Dec 2014 06:04:43 GMT

Hi,

I have imx6q7 board connected to a intel 6235 chipset behind pcie switch. The driver intel 6235 chip is not able to DMA the firmware to the device. Is there any special flag or setting that we need to enable to let the device DMA data from memory??

Thanks & Regards,

Kshitij Batra

Re: Imx6 pcie ep DMA issue

igorpadykov — Tue, 02 Dec 2014 11:28:49 GMT

Hi Kshitij

had you tried to connect intel 6235 chip without pcie switch, directly to i.MX6.

Also is it working correctly on PC ?

Best regards

igor

Re: Imx6 pcie ep DMA issue

kshitijbatra — Tue, 02 Dec 2014 18:06:32 GMT

Hi,

No we have not tried to connect it without the pcie switch. It is not possible for us to check that as the board is now fabricated that way. The module is working fine in the pc. Is there any amount RAM we have to allocate before kernel kicks in so that DMA operation is successful????

Thanks & Regards,

Kshitij Batra

Re: Imx6 pcie ep DMA issue

igorpadykov — Wed, 03 Dec 2014 01:37:28 GMT

I think you can try latest BSP

L3.10.17_1.0.2_iMX6QDLS_BUNDLE : i.MX 6Quad, i.MX 6Dual, i.MX 6DualLite, i.MX 6Solo

Linux Binary Demo Files and Linux BSP Documentation.

Size (K): 717480 Format: gz Rev #: L3.10.17_1.0.2 Modified: 10/29/2014

or 3.10.31 kernel : FSL Community BSP Release Notes 1.7 documentation

http://freescale.github.io/doc/release-notes/1.7/index.html

Best regards

igor