i.MX ProcessorsのトピックRe: imx6SX PCI Driver

imx6SX PCI Driver

simonlocke — Fri, 29 Apr 2016 12:09:44 GMT

Hi,

Can someone please point me to some instructions on how to build and include the PCI driver into the 3.14.28 poky Linux? I want to connect a PCIe board to my iMX6SX SABRE dev board and write a PCI device driver, but first I need to get the PCI root compiled into the kernel.

I tried following the instructions in the IMX6 Linux Reference Manual (IMX6LXRM 03/2015) section 42.2.2, but they do not make sense. If I run make in the either 'drivers/pci' or 'drivers/pci/host' folders I get 'no targets'.

Re: imx6SX PCI Driver

igorpadykov — Sun, 01 May 2016 00:09:42 GMT

Hi Simon

one can look at examples in

https://community.freescale.com/docs/DOC-95014

https://community.freescale.com/message/630828#comment-630828

Best regards

igor

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Re: imx6SX PCI Driver

simonlocke — Tue, 03 May 2016 08:53:14 GMT

Thanks Igor.

A lot of useful info on those two pages. However, still not sure I have a simple and non-contradictory set of instructions for building and including the PCIe Root Complex into a kernel and image.

In the Reference manual section 42.2.2 it says:

Root Complex is not supported by the default kernel configurations on i.MX 6 boards.

To set the default configuration, execute the following command as follows:

make CROSS_COMPILE=arm-none-linux-gnueabi-ARCH=arm imx_v7_defconfig

Configure the Root Complex to be built in:

# Bus support

CONFIG_PCI=y

CONFIG_PCI_DOMAINS=y

CONFIG_PCI_SYSCALL=y

# PCI host controller drivers

CONFIG_PCIE_DW=y

CONFIG_PCI_IMX6=y

NOTE

PCI Express support can't be built as a module.

But, the first link you pointed me to (https://community.freescale.com/docs/DOC-95014) refers to:

CONFIG_IMX_PCIE=y

# CONFIG_IMX_PCIE_EP_MODE_IN_EP_RC_SYS is not set

CONFIG_IMX_PCIE_RC_MODE_IN_EP_RC_SYS=y

However, this link also only talks about iMXSQ, where as I am using a iMX6 SoloX.

Either I need to do something to build the driver first, or I don't and I just need to add these lines to a bitbake recipe. And then which recipe? Do I need another recipe for a kernel, or can I just add the necessary lines to my custom image recipe?

Re: imx6SX PCI Driver

igorpadykov — Tue, 03 May 2016 09:11:49 GMT

PCIe configuration settings for iMX6 SoloX should be same

as for other i.MX6.

~igor

Re: imx6SX PCI Driver

simonlocke — Mon, 16 May 2016 15:31:24 GMT

I think I have found the instructions I was looking for:

Changing the Kernel configuration for i.MX6 SABRE

This is much clearer than any others I've found.