Part Number: PROCESSOR-SDK-AM437X Tool/software: Linux Hi all, I am working on latest SDK ti-processor-sdk-linux-am437x-evm-04.02.00.09-Linux-x86-Install. I have a custom board like am437x-gp-evm. we are using DP83620 ethernet PHY in RMII mode. I want to test the internal loopback of phy as from data sheet we can able to see : The DP83620 includes a Loopback Test mode for facilitating system diagnostics. The Loopback mode is selected through bit 14 (Loopback) of the Basic Mode Control Register (BMCR). Writing 1 to this bit enables MII transmit data to be routed to the MII receive outputs. But I am not able to access the BMCR register, Can anyone help me regarding how i should configure the phy in internal loopback mode. I am using the dp83848.c driver for this PHY, But there are not doing any BMCR register configuration in the driver. I am able to detect the PHY in kernel. If you need any other input let me know. Here is the output of dmeg: root@am437x-gc150:~# dmesg | grep mdio [ 1.319494] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6 [ 1.325633] davinci_mdio 4a101000.mdio: detected phy mask fffffff9 [ 1.333310] libphy: 4a101000.mdio: probed [ 1.337361] davinci_mdio 4a101000.mdio: phy[1]: device 4a101000.mdio:01, driver TI DP83620 10/100 Mbps PHY [ 1.347159] davinci_mdio 4a101000.mdio: phy[2]: device 4a101000.mdio:02, driver TI DP83620 10/100 Mbps PHY [ 9.560753] TI DP83620 10/100 Mbps PHY 4a101000.mdio:02: attached PHY driver [TI DP83620 10/100 Mbps PHY] (mii_bus:phy_addr=4a101000.mdio:0) [ 10.599989] TI DP83620 10/100 Mbps PHY 4a101000.mdio:01: attached PHY driver [TI DP83620 10/100 Mbps PHY] (mii_bus:phy_addr=4a101000.mdio:0) root@am437x-gc150:~# root@am437x-gc150:~# [ 41.050748] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off [ 41.058742] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready root@am437x-gc150:~# ifconfig eth0 Link encap:Ethernet HWaddr C4:BE:84:CB:5F:58 inet addr:192.168.15.173 Bcast:192.168.15.255 Mask:255.255.255.0 inet6 addr: fe80::c6be:84ff:fecb:5f58%763860/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:49 errors:0 dropped:0 overruns:0 frame:0 TX packets:50 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6770 (6.6 KiB) TX bytes:9366 (9.1 KiB) Interrupt:238 eth1 Link encap:Ethernet HWaddr C4:BE:84:CB:5F:5A UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1%763860/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:267 errors:0 dropped:0 overruns:0 frame:0 TX packets:267 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:187162 (182.7 KiB) TX bytes:187162 (182.7 KiB) usb0 Link encap:Ethernet HWaddr 02:DC:C8:F8:75:35 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Thanks
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