AM3358: RMII support

ali mahmoudi

Other Parts Discussed in Thread: AM3358

Currently I use a AM335x in a project, in which we have planned to use two Ethernet ports in RMII-mode, i.e. rmii1 and rmii2.
RMII-1 functions correctly, but regarding RMII-2 only works the transmit part. I can't receive anything on RMII-2. The LAN chip
is LAN8710. I can see on the oscilloscope that the RMII-2 port on sitara is fed mit receiving signal, but absolutely no trace of receive.
I have also investigated the values of different registers, e.g. statistics, Ethernet-RAM, etc, but unfortunately nothing is seen
with regard to receiving. I would like to know, if it is possible to use simultaneously two ethernet ports on AM3358 in RMII-mode?

over 5 years ago

0 Biser Gatchev-XID over 5 years ago

TI__Guru**** 393215 points

Hi,

Yes, RMII is supported on both CPSW Ethernet ports. Please post what software and which version you are using.

0 ali mahmoudi over 5 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

Hi, I use Linux 3.14.55 and I have selected the following lines from kernel Log:
net eth0: initializing cpsw version 1.12 (0)
davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
davinci_mdio 4a101000.mdio: phy[3]: device 4a101000.mdio:03, driver SMSC LAN8710/LAN8720
4a101000.mdio:00 - Link is Up - 100/Full
4a101000.mdio:00 - Link is Down
4a101000.mdio:03 - Link is Up - 100/Full
Interrupt Lines that are used currently : 41 (c0_rx_pend), 42 (c0_tx_pend)
I have also read the errata from TI, in which mentioed that paced interrupts does not work for
DMA channels 1-7, but currently only the channel 0 is activated, i.e. I expect that they function errorfree (but not sure).
after the second physical chip (connection mdio:3) become UP , the c0_rx_pend Interupt would not triggered more!

0 Biser Gatchev-XID over 5 years ago in reply to ali mahmoudi

TI__Guru**** 393215 points

Please complete this checklist and post the results here: processors.wiki.ti.com/.../5x_CPSW

0 ali mahmoudi over 5 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

The Linux Version that I use is 3.14.55 and I have selected the relevant lines from kernel log:
net eth0: initializing cpsw version 1.12
libphy: 4a101000.mdio:00 - Link is Up - 100/Full
libphy: 4a101000.mdio:00 - Link is Down
libphy: 4a101000.mdio:03 - Link is Up - 100/Full
When I connect the second LAN chip (regarding the port mdio:03) then I can send out ethernet pachets,
but I can't receive, in other words no receive interrupt on the Sitara.
The Interrupt lines that would be used are paced Interrupts 41 (c0_rx_pend) and 42 (c0_tx_pend).
In the errata that TI published, is mentioned that bpaced interrupts do not work for DMA-channels 1-7,
but because currently only the channel 0 is activated on the driver, it maybe logical to expect that the
receive interrupt functions correctly. I have all the registers that are relevant to receive explored and
unfortunately have no trace of receiving found!
Thank you in advance

0 ali mahmoudi over 5 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

when I start booting the board with the functioning ethernet-port (rmii-1) and then switch to the second ethernet port (rmii-2) the results for RMII-2 are as bellow:
#ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: external
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000000 (0)

Link detected: yes
#ethtool -S eth0
NIC statistics:
Good Rx Frames: 111896
Broadcast Rx Frames: 80996
Multicast Rx Frames: 26446
Pause Rx Frames: 0
Rx CRC Errors: 0
Rx Align/Code Errors: 0
Oversize Rx Frames: 0
Rx Jabbers: 0
Undersize (Short) Rx Frames: 0
Rx Fragments: 0
Rx Octets: 10005816
Good Tx Frames: 5549
Broadcast Tx Frames: 16
Multicast Tx Frames: 8
Pause Tx Frames: 0
Deferred Tx Frames: 0
Collisions: 0
Single Collision Tx Frames: 0
Multiple Collision Tx Frames: 0
Excessive Collisions: 0
Late Collisions: 0
Tx Underrun: 0
Carrier Sense Errors: 0
Tx Octets: 516046
Rx + Tx 64 Octet Frames: 79788
Rx + Tx 65-127 Octet Frames: 30225
Rx + Tx 128-255 Octet Frames: 3669
Rx + Tx 256-511 Octet Frames: 1787
Rx + Tx 512-1023 Octet Frames: 1952
Rx + Tx 1024-Up Octet Frames: 24
Net Octets: 10521862
Rx Start of Frame Overruns: 0
Rx Middle of Frame Overruns: 0
Rx DMA Overruns: 0
Rx DMA chan: head_enqueue: 1
Rx DMA chan: tail_enqueue: 84026
Rx DMA chan: pad_enqueue: 0
Rx DMA chan: misqueued: 0
Rx DMA chan: desc_alloc_fail: 0
Rx DMA chan: pad_alloc_fail: 0
Rx DMA chan: runt_receive_buf: 0
Rx DMA chan: runt_transmit_buf: 0
Rx DMA chan: empty_dequeue: 0
Rx DMA chan: busy_dequeue: 162080
Rx DMA chan: good_dequeue: 83963
Rx DMA chan: requeue: 0
Rx DMA chan: teardown_dequeue: 0
Tx DMA chan: head_enqueue: 5567
Tx DMA chan: tail_enqueue: 1
Tx DMA chan: pad_enqueue: 0
Tx DMA chan: misqueued: 1
Tx DMA chan: desc_alloc_fail: 0
Tx DMA chan: pad_alloc_fail: 0
Tx DMA chan: runt_receive_buf: 0
Tx DMA chan: runt_transmit_buf: 300
Tx DMA chan: empty_dequeue: 167647
Tx DMA chan: busy_dequeue: 0
Tx DMA chan: good_dequeue: 5568
Tx DMA chan: requeue: 5567
Tx DMA chan: teardown_dequeue: 0

and when I start booting the board from rmii-2 the results for RMII-2 are as bellow:
#ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Speed: 10Mb/s
Duplex: Half
Port: MII
PHYAD: 0
Transceiver: external
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000000 (0)

Link detected: yes

#ethtool -S eth0
NIC statistics:
Good Rx Frames: 0
Broadcast Rx Frames: 0
Multicast Rx Frames: 0
Pause Rx Frames: 0
Rx CRC Errors: 0
Rx Align/Code Errors: 0
Oversize Rx Frames: 0
Rx Jabbers: 0
Undersize (Short) Rx Frames: 0
Rx Fragments: 0
Rx Octets: 0
Good Tx Frames: 41
Broadcast Tx Frames: 33
Multicast Tx Frames: 8
Pause Tx Frames: 0
Deferred Tx Frames: 0
Collisions: 0
Single Collision Tx Frames: 0
Multiple Collision Tx Frames: 0
Excessive Collisions: 0
Late Collisions: 0
Tx Underrun: 0
Carrier Sense Errors: 0
Tx Octets: 2792
Rx + Tx 64 Octet Frames: 33
Rx + Tx 65-127 Octet Frames: 8
Rx + Tx 128-255 Octet Frames: 0
Rx + Tx 256-511 Octet Frames: 0
Rx + Tx 512-1023 Octet Frames: 0
Rx + Tx 1024-Up Octet Frames: 0
Net Octets: 2792
Rx Start of Frame Overruns: 0
Rx Middle of Frame Overruns: 0
Rx DMA Overruns: 0
Rx DMA chan: head_enqueue: 1
Rx DMA chan: tail_enqueue: 63
Rx DMA chan: pad_enqueue: 0
Rx DMA chan: misqueued: 0
Rx DMA chan: desc_alloc_fail: 0
Rx DMA chan: pad_alloc_fail: 0
Rx DMA chan: runt_receive_buf: 0
Rx DMA chan: runt_transmit_buf: 0
Rx DMA chan: empty_dequeue: 0
Rx DMA chan: busy_dequeue: 0
Rx DMA chan: good_dequeue: 0
Rx DMA chan: requeue: 0
Rx DMA chan: teardown_dequeue: 0
Tx DMA chan: head_enqueue: 41
Tx DMA chan: tail_enqueue: 0
Tx DMA chan: pad_enqueue: 0
Tx DMA chan: misqueued: 0
Tx DMA chan: desc_alloc_fail: 0
Tx DMA chan: pad_alloc_fail: 0
Tx DMA chan: runt_receive_buf: 0
Tx DMA chan: runt_transmit_buf: 33
Tx DMA chan: empty_dequeue: 41
Tx DMA chan: busy_dequeue: 0
Tx DMA chan: good_dequeue: 41
Tx DMA chan: requeue: 41
Tx DMA chan: teardown_dequeue: 0

Thank you very much for your help.

0 Schuyler Patton over 5 years ago in reply to ali mahmoudi

TI__Mastermind 37540 points

Hi,

TI will not be able to completely support this question due to the kernel version is over 5 years old and was not a released version supported by TI.

I can give you a couple of things to look at. You mentioned you were looking at eth1 RMII2, but it looks like the dump for eth0, RMII1 was provided again.

You need to prove that there is a link detected on eth1 (RMII2) as reported by ethtool eth1, I would also suggest that you do not hook up eth0 (RMII1), just concentrate on eth1. The reason for only hooking up eth1 is that the MAC HW statistics returned by ethtool eth0 are the combined.

Is this a new project?

Best Regards,
Schuyler

0 ali mahmoudi over 5 years ago in reply to Schuyler Patton

Prodigy 60 points

Hi,

Thank you for your effort, yes it is a custom project in which I try using two Ethernet ports in rmii mode.However, If I can arrange to investigate more time on this project, I try to

use a new stable version of kernel.

Best Regards, A. Mahmoudi

0 Schuyler Patton over 5 years ago in reply to ali mahmoudi

TI__Mastermind 37540 points

Hi,

Ok, we will wait for when you are able to return to the project. In the meantime I will mark the thread as resolved. If you have additional questions please continue on this thread if is not locked, else please start a new thread based on this one.

Best Regards,
Schuyler

0 ali mahmoudi over 5 years ago in reply to Schuyler Patton

Prodigy 60 points

Hi,

Thank you for your help, next week I change the kernel version and investigate the problem again.

A. Mahmoudi

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AM3358: RMII support