On Thu, Sep 27, 2012 at 2:07 PM, Carolyn Smith carolynsmi56@gmail.com wrote:
On Thu, Sep 27, 2012 at 12:00 PM, Fabio Estevam festevam@gmail.com wrote:
On Thu, Sep 27, 2012 at 3:27 PM, Carolyn Smith carolynsmi56@gmail.com wrote:
Hello,
Has anyone had any success getting RMII ethernet to work on an i.MX6 Solo or DualLite? I am pretty confident I have the IOMUX registers set up properly and the clocking configured and working properly but am not seeing any activity on the TXEN line when trying to transmit a packet.I can access the PHY's registers so I think that means MDC and MDIO must be working.
Which Ethernet PHY are you using and which board?
Can you post your patches in the list for review, so that we can try to understand the problem better?
Regards,
Fabio Estevam
It's an SMSC LAN8720A PHY on a custom i.MX6 Solo board. I can't post all my patches at this point but I could provide register dumps of anything you think might be relevant.
I did make a change to fec_mxc.c in the fec_open function. I #ifdef'ed out this section
#ifdef FEC_QUIRK_ENET_MAC { u32 ecr = readl(&fec->eth->ecntrl) & ~FEC_ECNTRL_SPEED; u32 rcr = (readl(&fec->eth->r_cntrl) & ~(FEC_RCNTRL_RMII | FEC_RCNTRL_RMII_10T)) | FEC_RCNTRL_RGMII | FEC_RCNTRL_MII_MODE; if (speed == _1000BASET) ecr |= FEC_ECNTRL_SPEED; else if (speed != _100BASET) rcr |= FEC_RCNTRL_RMII_10T; writel(ecr, &fec->eth->ecntrl); writel(rcr, &fec->eth->r_cntrl); } #endif
Since it seems to put the ENET_RCR register into RGMII mode which is not what I am using. I have ENET_RCR set to 0x05ee0124.
Thanks, Carolyn
As it turns out, I found the magic bullet late last night and got ethernet working on my board. The secret turned out to be the IOMUXC_ENET_IPG_CLK_RMII_SELECT_INPUT daisy chain register. I had it set incorrectly so the processor wasn't getting the ethernet clock.
Regards, Carolyn