[yocto] [meta-xilinx] How to include Xilinx DMA driver

[Fan Zhang]

Hi Sandeep,

Thank you for your answer.

Can you give some more info on how to get the CCF working in Yocto 
Linux? I can't find much online. I tried building clkc.c and pll.c as 
out of tree driver by copy over content in the folder 
kernel-source\drivers\clk\zynq, change the makefile and add the .bb file 
for build.

The module compiled but fail to load. Giving me message "Unknown symbol 
in module or unknown parameter"

On a semi-related issue. Is it recommended to use Yocto Linux for new 
development? or PetaLinux following the  "Workflow Tutorial 6 UG1156 
(v2017.1) April 5, 2017" documentation?


Many thanks,

Fan

On 11/09/2017 1:30 PM, Sandeep Gundlupet Raju wrote:
> Hi Fan,
>
> Thanks,
> Sandeep
>
>
> -----Original Message-----
> From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Fan Zhang
> Sent: Monday, September 11, 2017 9:38 AM
> To: Robert Berger <yocto.user.mailinglist at gmail.com>; yocto at yoctoproject.org; meta-xilinx at yoctoproject.org
> Subject: Re: [meta-xilinx] [yocto] How to include Xilinx DMA driver
>
> Hi all
>
> Thank you Robert for the guide. I tried option [1] out of tree driver.
> Got it compiled, and loaded when image boot up. My understand of the dma driver is that Linux DMA engine depends on the Xilinx device driver
> (xilinx_cdma.c) and then dma_proxy.c driver depends on the Linux DMA engine. Am I correct?
> Yes
> It does seems Xilinx_cdma is loaded succefully, but dmatest didn't. Here is the message I've got:
>
> In order to use DMATEST IP assumes AXI_DMA IP streaming interfaces are connected back to back in the HW design. Refer http://www.wiki.xilinx.com/DMA+Drivers+-+Soft+IPs
>
> root at microzed-zynq7:~# dmesg | grep dma
> [    0.202348] dma-pl330 f8003000.dmac: Loaded driver for PL330 DMAC-241330
> [    0.202370] dma-pl330 f8003000.dmac:         DBUFF-128x8bytes
> Num_Chans-8 Num_Peri-4 Num_Events-16
> [    0.202654] xilinx-vdma 7e200000.dma: failed to get axi_clk (4294967294)
> [    0.202679] xilinx-vdma: probe of 7e200000.dma failed with error -2
> [    2.609417] xilinx-cdma 7e200000.dma: Xilinx AXI CDMA Engine driver
> Probed!!
> [    2.635552] Modules linked in: axidmatest(O+) xilinx_cdma(O)
> [    2.659271] PC is at xilinx_axidmatest_probe+0xd8/0x418 [axidmatest]
> [    2.916646] [<bf00522c>] (xilinx_axidmatest_probe [axidmatest]) from
> [<c03905c8>] (platform_drv_probe+0x50/0xb0)
> [    3.028812] udevd[674]: worker [687] failed while handling
> '/devices/soc0/dmatest at 0'
>
>   From these message, I'm guessing there is an issue in configuration of
> the common clock framework. Is the clkc.c needs to be built as an out of
> tree module to be used in Yocto?
>
>  From 2017.1 onwards CCF is mandatory for all Xilinx drivers.
> Fan
>
> On 08/09/2017 12:20 PM, Robert Berger wrote:
>> Hi,
>>
>> On 2017-09-08 19:00, Fan Zhang wrote:
>>> Hi All,
>>>
>>> 1. How to include xilinx_dma.c driver in to the poky image build?
>> In case you want to include out-of tree drivers it could work like
>> this[1] in case you want in-tree it's just a kernel patch similar to[2].
>>
>> Apparently you will need to turn on kernel config features. You might
>> try something like this[3].
>>
>> For Yocto/Xilinx specific questions you might want to ask on the
>> Xilinx mailing list[4].
>>
>> [1]
>> https://github.com/RobertBerger/meta-mainline/tree/pyro-training-v4.9.x/multi-v7-ml/recipes-zedboard/xilinx-dma
>>
>> [2]
>> https://github.com/RobertBerger/meta-mainline/blob/pyro-training-v4.9.x/multi-v7-ml/recipes-kernel/linux/patch/4.9.x/patches/zedboard-zynq7/zynq-qspi/0001-zynq-zedboard-non-mainline-qspi-support.patch
>>
>> [3]
>> https://github.com/RobertBerger/meta-mainline/tree/pyro-training-v4.9.x/multi-v7-ml/recipes-kernel/linux/config/multi-v7-ml-base/features/zynq-qspi
>>
>> [4] https://lists.yoctoproject.org/listinfo/meta-xilinx
>>
>> Regards,
>>
>> Robert
>>
>>

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