What are the conditions for PCIE-PHY to start negotiation?

[tamotsu]

Hi.

This is an original circuit based on the i.MX7D SABRE circuit.

I'm debugging u-boot.

I have an M.2 SATA card inserted into the PCIE connector on this board.

The PCIE-PHY does not send a signal to the SATA card to start negotiation.

What are the conditions for starting negotiation?

Best Regards.

[Zhiming_Liu]

Hi @tamotsu 

If you use pci command in uboot to read M.2 card and no signal, this indicates an issue with your driver's power-up/reset process. You can add log print with register value to check that.

Best Regards,
Zhiming

[tamotsu]

Hi Zhiming_Liu.

I did some research after asking the question.

I received a response from the M.2 SATA SSD manufacturer that they do not send out any signals to start negotiation.

I think that M.2SATA needs to be initialized in order for PCIE-PHY and M.2SATA to negotiate.

I wrote code that uses "bootcmd" to execute "do_sata()".

"do_sata()" executes u-boot's "uclass_get_device() in uclass.c". However, SATA cannot be registered as a device.

The i.MX6Q has a SATA address and there is a SATA item in the device tree.

To create a SATA item in the device tree of the i.MX7D, can I refer to the i.MX6Q?

How do you enable mSATA in u-boot on an i.MX7D SABRE board?

Best Ragerds.

[Zhiming_Liu]

Hi @tamotsu 

We didn't test SATA in uboot, please refer other platform like i.MX6Q to support SATA.

Best Regards,
Zhiming