Linux/AM5718: PRU MII RXLINK issue

Hello Suresh,

I am treating this as a continuation of our discussion on your post PRU Ethernet does not work. We will cover RXLINK related information on this thread, and other issues with debugging your ethernet on the other thread. Let me know if I am making the wrong assumption about how you wanted to split the topics.

In your previous post, you said "For your information, We have removed the rxlink input connections in AM5718-IDK then the behavior is same as our custom platform behavior. So that we requested you explain the rxlink functionality."

Please give me more information about "the behavior is the same as our custom platform behavior". Are you saying that standard PRU Ethernet on an AM5718 IDK board will stop working if you remove the rxlink input connection? (and make no other hardware modifications) Or are you saying something else?

Regards,

Nick

Hi Nick,

Yes, your split-up is good. We will discuss about the rxlink related things here.


Yes,The rxlink input was disconnected by removing the "R188" from the AM5718-IDK Rev 1.3B then the PRU Ethernet doesn't work. The link-up & link-down messages are not showed while connect & remove the Ethernet cable.

Regards,
Suresh

Hello Suresh,

It sounds like that behavior is unexpected from a PRU Ethernet Linux driver standpoint - Linux does not get the PHY link status from RXLINK. It could take a couple of days before I have more information on how we expect the PRU firmware to interact with RXLINK (if at all).

Regards,

Nick

Hello Suresh,

Update, still waiting on firmware information. I hope to get a response this week, but team members are on vacation to celebrate 4th of July so I might not have any new information until next week.

Regards,

Nick

Hello Suresh,

Double checking on your setup to observe your issue on the AM571x IDK board. Is this true? If not, please correct anything:

1) the ONLY hardware modification was the removal of R188 - no other hardware was changed

2) You used the default, out-of-the-box SD card with no software changes

Regards,

Nick

Hello Suresh,

Double checking on your setup to observe your issue on the AM571x IDK board. Is this true? If not, please correct anything:

1) the ONLY hardware modification was the removal of R188 - no other hardware was changed

2) You used the default, out-of-the-box SD card with no software changes

Regards,

Nick

Suresh,

The rxlink signal is optional.  For example, take a look at the ICSS1 connection of the AM572x IDK.  It doesn't use the rxlink signal at all.

I am not 100% sure what the mechanism is to disable the rxlink.  It might be as simple as not configuring its mux.  For example, I wonder if you made this change on the AM571x IDK with the resistor removed if it would start working again:

diff --git a/board/ti/am57xx/mux_data.h b/board/ti/am57xx/mux_data.h
index a48f681840..c38d1545b0 100644
--- a/board/ti/am57xx/mux_data.h
+++ b/board/ti/am57xx/mux_data.h
@@ -934,7 +934,6 @@ const struct pad_conf_entry core_padconf_array_icss1eth_am571x_idk[] = {
{VOUT1_D18, (M12 | PIN_INPUT_PULLDOWN)}, /* vout1_d18.pr1_mii0_rxd1 */
{VOUT1_D19, (M12 | PIN_INPUT_PULLDOWN)}, /* vout1_d19.pr1_mii0_rxd0 */
{VOUT1_D20, (M12 | PIN_INPUT_PULLUP)}, /* vout1_d20.pr1_mii0_rxer */
- {VOUT1_D21, (M12 | PIN_INPUT_PULLDOWN)}, /* vout1_d21.pr1_mii0_rxlink */
{VOUT1_D22, (M12 | PIN_INPUT_PULLDOWN)}, /* vout1_d22.pr1_mii0_col */
{VOUT1_D23, (M12 | PIN_INPUT_PULLDOWN)}, /* vout1_d23.pr1_mii0_crs */

Can you check on your board if interrupts are functioning correctly.  Here's an example from my AM572x IDK:

root@am57xx-evm:~# [ 2903.705981] prueth pruss2_eth eth3: Link is Up - 100Mbps/Full - flow control rx/tx

cat /proc/interrupts

           CPU0       CPU1

85:        120          0      CBAR 335 Level     48484000.ethernet

86:         80          0      CBAR 336 Level     48484000.ethernet

206:         14          0  48057000.gpio  30 Edge      4b2b2400.mdio:00

207:          3          0  48057000.gpio  31 Edge      4b2b2400.mdio:01

208:       5773          0  4b2a0000.intc  20 Edge      eth2

209:        270          0  4b2a0000.intc  22 Edge      eth2

210:          0          0  4b2a0000.intc  26 Edge      eth2

211:         56          0  4b2a0000.intc  23 Edge      eth3

212:         17          0  4b2a0000.intc  21 Edge      eth3

213:          0          0  4b2a0000.intc  27 Edge      eth3

In particular, I could see the interrupt count under CPU0 increment by 1 every time I unplugged or plugged in the cable.

Best regards,
Brad

Hello Suresh,

I'm assuming you resolved the issue. If not, feel free to take a look at my and Brad's responses above and continue the conversation.

Regards,

Nick

Hi Nick,

Sorry for the delayed response. I'm out for some other works.

Still we are facing the issue.So we will check the Mr.Brad Griffis suggestions and then i'll let you know.

Thanks & Regards,
Suresh 

Hi Mr.Brad griffis & Mr.Nick,

In our custom board, the PRU Ethernet Interrupt pin not connected to AM5718 processor. After connect the PRU Ethernet interrupt pin to Processor then we able to see the Link-Up & Link-Down debug messages while connect & disconnect the Ethernet cable.

But now we are facing the internet not connected/IP not assigned issue. Could you check below ifconfig debug print.


Debug Print:

root@am57xx-evm:~# [ 1073.367287] prueth pruss2_eth eth0: Link is Up - 10Mbps/Half - flow control off
[ 1073.514166] prueth pruss2_eth eth0: Link is Down
[ 1075.449652] prueth pruss2_eth eth0: Link is Up - 100Mbps/Full - flow control rx/tx

root@am57xx-evm:~# ifconfig
eth0 Link encap:Ethernet HWaddr AE:E9:D9:3B:9E:19 
inet6 addr: fe80::ace9:d9ff:fe3b:9e19%775872/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:0 (0.0 B) TX bytes:2760 (2.6 KiB)

eth1 Link encap:Ethernet HWaddr 8A:7F:33:55:A3:A2 
inet6 addr: fe80::887f:33ff:fe55:a3a2%775872/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:0 (0.0 B) TX bytes:2690 (2.6 KiB)

lo Link encap:Local Loopback 
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1%775872/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:177 errors:0 dropped:0 overruns:0 frame:0
TX packets:177 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:13860 (13.5 KiB) TX bytes:13860 (13.5 KiB)

root@am57xx-evm:~#

Kindly check & feedback us to resolve this issue.

Thanks & Regards,
Suresh

Please run "ethtool eth0" and "ethtool -S eth0" and provide the output.

Brad, thank you for jumping in.

Brad & Suresh, I will be out for the rest of this week. I will be back next week.

Regards,

Nick

Hi Brad,

As per your request, Here i have attached the "ethtool eth0 & ethtool -S eth0" commands entered log file for your reference. 

Log File:AM5718_ethtool_cmd_Log.zip

Regards,
Suresh

HI Brad & Nick,

Any feedback for the "ethtool eth0" and "ethtool -S eth0" command output.

Regards,
Suresh

Please download this bash script to your AM57xx board and execute it:

http://git.ti.com/sitara-dss-files/am57xx-dss-files/blobs/raw/master/padconf/am57xx-padconf-rd1.sh

The output will be a *.rd1 file.  Please attach it to the forum.  You can rename as *.txt if it won't attach with that extension.

Hi Brad, 

Please find the uploaded "am57xx-padconf_2019-08-20_052651.txt" file for your reference. Could you check & feedback.

File: 

PadConf AM571x
0x4A003400 0x0005000F
0x4A003404 0x0005000F
0x4A003408 0x0005000F
0x4A00340C 0x0005000F
0x4A003410 0x0005000F
0x4A003414 0x0005000F
0x4A003418 0x0005000F
0x4A00341C 0x0005000F
0x4A003420 0x0005000F
0x4A003424 0x0005000F
0x4A003428 0x0005000F
0x4A00342C 0x0005000F
0x4A003430 0x0005000F
0x4A003434 0x0005000F
0x4A003438 0x0005000F
0x4A00343C 0x0005000F
0x4A003440 0x00050106
0x4A003444 0x00050106
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0x4A003454 0x00050106
0x4A003458 0x00050106
0x4A00345C 0x00050106
0x4A003460 0x00050106
0x4A003464 0x00050106
0x4A003468 0x00050106
0x4A00346C 0x0006000E
0x4A003470 0x0006000E
0x4A003474 0x00050101
0x4A003478 0x00050101
0x4A00347C 0x00050101
0x4A003480 0x00050101
0x4A003484 0x00050101
0x4A003488 0x00010101
0x4A00348C 0x00060101
0x4A003490 0x00060101
0x4A003494 0x00060101
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0x4A0034A0 0x00060101
0x4A0034A4 0x00060101
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0x4A0034B0 0x00060101
0x4A0034B4 0x0001000E
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0x4A0034C4 0x0001000E
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0x4A003590 0x0000000B
0x4A003594 0x0005000B
0x4A003598 0x00000103
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0x4A003688 0x00010000
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0x4A003690 0x00060000
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0x4A0036D0 0x0001000E
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0x4A003798 0x0004000B
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0x4A0037A8 0x0001000E
0x4A0037AC 0x0001000E
0x4A0037B0 0x0001000E
0x4A0037B4 0x0001000E
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0x4A0037C0 0x00050000
0x4A0037C4 0x000D0000
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0x4A0037E4 0x00010000
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0x4A0037EC 0x0006000F
0x4A0037F0 0x0006000F
0x4A0037F4 0x0006000F
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0x4A003828 0x00010000
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0x4A003830 0x00060000
0x4A003834 0x000E0000
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0x4A00385C 0x00010000
0x4A003860 0x00000000
0x4A003864 0x00010000

How have you configured pruss2 in your device tree?  Can you please share some snippets?  Did you configure ti,pruss-gp-mux-sel?

When you built your hardware, did you model after specific TI board?  If so, which specifically?  There are some subtle differences between AM572x IDK and AM571x IDK related to the Ethernet hookup.  We need to make sure the hardware and software are consistent.

Hi Mr.Brad,

Yes, we have followed the AM5718 EVK to built our custom platform. Please find the uploaded PRUSS2 configuration screenshots for your reference.

Files: DTS_File_PRUSS2_ScreenShots.zip

For your information, the same S/W binary working correctly in AM5718 EVK(IP assigned & able ping the host) but not worked in our custom board(IP not assigned). Could you help us conclude this issue ASAP.


Regards,
Suresh 

Hello Suresh,

I apologize for the delay.

1) Is this correct?: you only have two ethernet ports: eth0 and eth1. Those relate to pruss2_eth0_phy and pruss2_eth1_phy in the dts files.

2) Are you trying to assign an IP address through DHCP, statically, or some other way?

3) Can you manually assign an IP address and ping or iperf with the port? e.g., if your computer's ethernet port is 192.168.1.1:

ifconfig eth0 192.168.1.2 (assign it an IP address with the same subnet)

Regards,

Nick