i.MX ProcessorsのトピックEnabling two ethernet ports in u-boot

Enabling two ethernet ports in u-boot

corono — Fri, 25 Oct 2019 15:07:22 GMT

I've built my own board based on the iMX7dsabre eval board. One of the differences: Both ethernet ports are on their own MDIO-line. Both ports work in Li-nux, but in u-boot (2018-03_4), only one works. I guess the problem is the config-header I took (and adjusted) from the sabre board:

#define CONFIG_FEC_ENET_DEV 0

#define CONFIG_PHY_BROADCOM
/* ENET1 */
#if (CONFIG_FEC_ENET_DEV == 0)
#define IMX_FEC_BASE                                          ENET_IPS_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR                0x0
#define CONFIG_ETHPRIME                                   "eth0"
#define CONFIG_FEC_MXC_MDIO_BASE            ENET_IPS_BASE_ADDR
/* ENET2 */
#elif (CONFIG_FEC_ENET_DEV == 1)
#define IMX_FEC_BASE                                          ENET2_IPS_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR                0x1
#define CONFIG_ETHPRIME                                   "eth1"
#define CONFIG_FEC_MXC_MDIO_BASE          ENET2_IPS_BASE_ADDR
#endif

#endif

If I define CONFIG_FEC_ENET_DEV as 0, only port eth0 works in u-boot, if I define CONFIG_FEC_ENET_DEV as 1, only port eth1 works. So the settings should be correct. The problem is, that CONFIG_FEC_MXC_PHYADDR is a parameter from u-boot and can only be defined for one port.

If I scan the devices in u-boot with mdio list for ONFIG_FEC_ENET_DEV 0:

=> mdio list
FEC0:
0 - Generic PHY <--> ethernet@30be0000
FEC1:
0 - Generic PHY <--> ethernet@30bf0000

For ONFIG_FEC_ENET_DEV 1:

=> mdio list
FEC0:
1 - Generic PHY <--> ethernet@30be0000
FEC1:
1 - Generic PHY <--> ethernet@30bf0000

Both ports get the address that is defined in the header file. How can I change the header file to enable both ports at the same time? (Something like CONFIG_FEC2_MXC_PHYADDR)

Thanks.

Sebastian

Re: Enabling two ethernet ports in u-boot

igorpadykov — Fri, 25 Oct 2019 22:59:27 GMT

Hi Sebastian

one can look on similar solution for i.mx6ul :

https://community.nxp.com/thread/500763

Best regards
igor
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Re: Enabling two ethernet ports in u-boot

corono — Mon, 28 Oct 2019 08:15:34 GMT

H Igor

Thanks for your answer. But I'm not sure if it helps.

My problem is in u-boot. In linux, both ports work. Deleting the ethaddr variable does not help. Also in u-boot, both ports work, but not at the same time, depending on the hardcoded CONFIG_FEC_ENET_DEV flag. And when I have a look in the board header file of the linked imx6ull eval board, it looks quite similar to the one from the imx7dsabre:

#ifdef CONFIG_CMD_NET
#define CONFIG_CMD_MII
#define CONFIG_FEC_MXC
#define CONFIG_MII
#define CONFIG_FEC_ENET_DEV 1

#if (CONFIG_FEC_ENET_DEV == 0)
#define IMX_FEC_BASE                               ENET_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR    0x2
#define CONFIG_FEC_XCV_TYPE             RMII
#ifdef CONFIG_DM_ETH
#define CONFIG_ETHPRIME                      "eth0"
#else
#define CONFIG_ETHPRIME "FEC0"
#endif
#elif (CONFIG_FEC_ENET_DEV == 1)
#define IMX_FEC_BASE                               ENET2_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR    0x1
#define CONFIG_FEC_XCV_TYPE             RMII
#ifdef CONFIG_DM_ETH
#define CONFIG_ETHPRIME                      "eth1"
#else
#define CONFIG_ETHPRIME                      "FEC1"
#endif
#endif
#define CONFIG_FEC_MXC_MDIO_BASE ENET2_BASE_ADDR
#endif

With CONFIG_FEC_ENET_DEV, port 0 or 1 is selected. So there is the same problem as in the imx7dsabre.

Sebastian

Re: Enabling two ethernet ports in u-boot

igorpadykov — Mon, 28 Oct 2019 10:53:18 GMT

Hi Sebastian

one can look at uboot two enet guidelines:

Can u-boot support more than one ethernet port? - Stack Overflow

BELK-TN-004: Managing both Ethernet ports with U-Boot (BoraEVB/BoraXEVB) - DAVE Developer's Wiki

Best regards
igor

Re: Enabling two ethernet ports in u-boot

corono — Thu, 07 Nov 2019 15:58:04 GMT

Hi Igor

Thanks for the links. I already found them, but it does not help. The GIT-Repository of the BELK-Board is password protected, I don't have access. And I know how to switch between the two ports in u-boot, but only one works because of the wrong configuration (see the previous posts).

The sabre board uses the "fec_mxc" u-boot driver. I don't see a way to use this driver with two ports, the address is hardcoded:

#ifdef CONFIG_FEC_MXC_PHYADDR
int fecmxc_initialize(bd_t *bd)
{
return fecmxc_initialize_multi(bd, -1, CONFIG_FEC_MXC_PHYADDR,
IMX_FEC_BASE);
}
#endif

Or:

#ifdef CONFIG_FEC_MXC_MDIO_BASE
   /*
   * The i.MX28 has two ethernet interfaces, but they are not equal.
   * Only the first one can access the MDIO bus.
   */
   base_mii = CONFIG_FEC_MXC_MDIO_BASE;
#else

There are these defines (CONFIG_FEC_MXC_PHYADDR, CONFIG_FEC_MXC_MDIO_BASE) in the driver. They are different for both ports on my board, but can't be set independently.

Best Regards

Sebastian

Re: Enabling two ethernet ports in u-boot

igorpadykov — Fri, 08 Nov 2019 00:57:57 GMT

Hi Sebastian

suggested solution for i.mx6ul has the similar #defines.

Best regards
igor