topic IMX6UL ENET2 rx error frame in i.MX Processors

IMX6UL ENET2 rx error frame

kr90911 — Tue, 19 May 2020 07:35:27 GMT

Hi all,

I'm working on my custom IMX6UL board with YOCTO sumo L4.14.98_2.3.1.

The fec function driver work fine on EVK,but it's not working on custom board with same image.

Here are some logs about fec on custom board:

root@imx6ulevk:~# fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

ifconfig
eth0 Link encap:Ethernet HWaddr C4:E7:94:DF:00:00
inet6 addr: fe80::c6e7:94ff:fedf:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:11 dropped:0 overruns:0 frame:11
TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:4151 (4.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:80 errors:0 dropped:0 overruns:0 frame:0
TX packets:80 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5760 (5.6 KiB) TX bytes:5760 (5.6 KiB)
root@imx6ulevk:~# udhcpc
udhcpc: started, v1.27.2
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
^C

root@imx6ulevk:~# dmesg |grep fec
fec 20b4000.ethernet: 20b4000.ethernet supply phy not found, using dummy regulator
libphy: fec_enet_mii_bus: probed
fec 20b4000.ethernet eth0: registered PHC device 0
systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx

The eth0 rx signal can't get any right packets on custom board.

The ENET2_nINT pin on KSZ8081RNB doesn't connect to Tamper6 pin on CPU, but connect to extension IO chip.

Does my problem caused by wrong connection of ENET2_nINT pin?

If the answer is yes,how to modify fec driver to fix it?

Re: IMX6UL ENET2 rx error frame

igorpadykov — Tue, 19 May 2020 10:59:25 GMT

Hi west

first one can check if its works in uboot, pay attention to fec2_pads[],

check with oscilloscope clock "REF_CLK2 for ENET2" in function setup_fec().

mx6ul_14x14_evk.c\mx6ul_14x14_evk\freescale\board - uboot-imx - i.MX U-Boot

Best regards
igor
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Re: IMX6UL ENET2 rx error frame

kr90911 — Wed, 20 May 2020 02:44:31 GMT

Hi igor,

Thanks for your reply.

I probed the pin 9 which is clock input pin on KSZ8081RNB when in u-boot,and clock frequency is the same as EVK about 50MHz.

Re: IMX6UL ENET2 rx error frame

igorpadykov — Wed, 20 May 2020 05:08:51 GMT

Hi west

one can printf uboot enet registers both in custom board and

working case (EVK), compare them what is wrong.

Best regards
igor

Re: IMX6UL ENET2 rx error frame

kr90911 — Wed, 20 May 2020 07:56:04 GMT

Hi igor,

Thanks for your help.

It seems that the only changed register value are "&iomuxc_regs->gpr[1]" in setup_fec().

The data abort problem occurred when cpu printf register like "&iomuxc_regs->gpr[1]",so I print register value with md.l command in u-boot:

=> md.l 0x020E4004 1 (in reference manual,IOMUXC_GPR_GPR1 address =20E_4004h )
020e4004: 0f440005 ..D.

The register value on custom board is the same as EVK when running u-boot.

But the dhcp command didn't work on custom board when in u-boot.

I tried to connect the ENET2_nINT pin to Tamper6 on cpu,but it didn't help.