check if RGMII works

check if RGMII works

[Maxim Gorbachyov]

Hello.

I'm trying to use barebox (current git version) with a Freescale
i.MX6q based board. The board is similar to Armadillo 2, but it comes
with another Ethernet PHY. Barebox starts on the board, and there is a
fec_imx0:

barebox@Freescale i.MX6q myboard:/ devinfo fec_imx0
resources:
num   : 0
start : 0x02188000
size  : 0x00001000
driver: fec_imx
no info available for fec_imx0
no parameters available

I've removed AR8031 (Armadillo 2 PHY) code from the mx6_rgmii_rework()
and added these lines:

        for (i = 0; i < 16; ++i) {
                val = mii_read(mdev, mdev->address, i);
                printf("%s() PHY register %d: 0x%04x\n", __FUNCTION__, i, val);
        }

Relevant boot log:

mx6_rgmii_rework() PHY register 0: 0x7fff
mx6_rgmii_rework() PHY register 1: 0xffff
mx6_rgmii_rework() PHY register 2: 0x7fff
mx6_rgmii_rework() PHY register 3: 0xffff
mx6_rgmii_rework() PHY register 4: 0x7fff
mx6_rgmii_rework() PHY register 5: 0xffff
mx6_rgmii_rework() PHY register 6: 0x7fff
mx6_rgmii_rework() PHY register 7: 0xffff
mx6_rgmii_rework() PHY register 8: 0x7fff
mx6_rgmii_rework() PHY register 9: 0xffff
mx6_rgmii_rework() PHY register 10: 0x7fff
mx6_rgmii_rework() PHY register 11: 0xffff
mx6_rgmii_rework() PHY register 12: 0x7fff
mx6_rgmii_rework() PHY register 13: 0xffff
mx6_rgmii_rework() PHY register 14: 0x7fff
mx6_rgmii_rework() PHY register 15: 0xffff

These values are not PHY defaults and actually look strange. I'm not
sure if mii_read() really works here.
Could you please suggest how to check if RGMII communication works?

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Re: check if RGMII works

[Sascha Hauer]

On Tue, May 29, 2012 at 07:37:47PM +0300, Maxim Gorbachyov wrote:
> Hello.
> 
> I'm trying to use barebox (current git version) with a Freescale
> i.MX6q based board. The board is similar to Armadillo 2, but it comes
> with another Ethernet PHY. Barebox starts on the board, and there is a
> fec_imx0:
> 
> barebox@Freescale i.MX6q myboard:/ devinfo fec_imx0
> resources:
> num   : 0
> start : 0x02188000
> size  : 0x00001000
> driver: fec_imx
> no info available for fec_imx0
> no parameters available
> 
> I've removed AR8031 (Armadillo 2 PHY) code from the mx6_rgmii_rework()
> and added these lines:
> 
>         for (i = 0; i < 16; ++i) {
>                 val = mii_read(mdev, mdev->address, i);
>                 printf("%s() PHY register %d: 0x%04x\n", __FUNCTION__, i, val);
>         }
> 
> Relevant boot log:
> 
> mx6_rgmii_rework() PHY register 0: 0x7fff
> mx6_rgmii_rework() PHY register 1: 0xffff
> mx6_rgmii_rework() PHY register 2: 0x7fff
> mx6_rgmii_rework() PHY register 3: 0xffff
> mx6_rgmii_rework() PHY register 4: 0x7fff
> mx6_rgmii_rework() PHY register 5: 0xffff
> mx6_rgmii_rework() PHY register 6: 0x7fff
> mx6_rgmii_rework() PHY register 7: 0xffff
> mx6_rgmii_rework() PHY register 8: 0x7fff
> mx6_rgmii_rework() PHY register 9: 0xffff
> mx6_rgmii_rework() PHY register 10: 0x7fff
> mx6_rgmii_rework() PHY register 11: 0xffff
> mx6_rgmii_rework() PHY register 12: 0x7fff
> mx6_rgmii_rework() PHY register 13: 0xffff
> mx6_rgmii_rework() PHY register 14: 0x7fff
> mx6_rgmii_rework() PHY register 15: 0xffff
> 
> These values are not PHY defaults and actually look strange. I'm not
> sure if mii_read() really works here.

It seems not.

> Could you please suggest how to check if RGMII communication works?

You already found out ;)

Have you checked the iomux settings are correct?

Sascha

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