On Sat, Jul 30, 2016 at 6:49 AM, Edward Wingate <[email protected]> wrote: > > Thank you Mike. As I suspected, it's still broken when changing link speed > that way. > > If anyone would confirm their Linux built using meta-xilinx can > change/re-negotiate eth0 link speed from 1Gbps to 100Mbps, I'd appreciate it > very much. I'm using a custom Zynq-7020 board and the xemacps driver. As my > original message shows, xemacps driver thinks it is successful in changing > the clock speed to 25 MHz for 100 Mbps operation. >
I tested this with both the emacps and the macb driver (linux-xlnx kernel v2016.2, on a ZYBO). Both advertise and link correctly with a 100M switch and forced advert 100M with a 1G switch, and packets are transmitted and received correctly. If you are having issues with this before diving into the board/hw/etc testing double check your clock setup (and that it is propagated to FSBL/SPL correctly), and/or EMIO setup if you are routing through PL. > > > On Fri, Jul 29, 2016 at 1:20 AM, Mike Looijmans <[email protected]> > wrote: >> >> On 29-07-16 09:21, Edward Wingate wrote: >> > On Thu, Jul 28, 2016 at 10:15 PM, Mike Looijmans >> > <[email protected]> wrote: >> >> >> >> If you use ethtool to change the speed, only change the autonegotiation >> >> mask >> >> (0x0F for 10/100 only). Just forcing the speed to 100 usually doesn't work >> >> because without negotiation enabled, the other side won't know about it. >> > >> > What ethtool options will set the autonegotiation mask? I only see >> > options to turn on/off autonegotiation. I will try, but regardless, >> > starting up plugged into a 100Mbps switch, or unplugging from 1Gbps >> > switch and plugging into 100Mbps switch also doesn't work. >> >> To go to 100Mbps mode: >> >> ethtool -s eth0 advertise 0x0f >> >> Back to gigabit: >> >> ethtool -s eth0 advertise 0x3f >> >> >> On the mpsoc this is broken too, but I guess that's just work in progress... >> >> root@zcu102-zynqmp:~# ethtool -s eth0 advertise 0x0f >> macb ff0e0000.ethernet eth0: link down >> macb ff0e0000.ethernet eth0: unable to generate target frequency: 25000000 Hz If you are using the in kernel device trees for zcu102,.they currently have fixed 125MHz clocks for the gems. https://github.com/Xilinx/linux-xlnx/blob/master/arch/arm64/boot/dts/xilinx/zynqmp-clk.dtsi#L123 Regards, Nathan >> >> >> >> >> Kind regards, >> >> >> >> Mike Looijmans >> >> System Expert >> >> >> >> >> >> TOPIC Products >> >> >> >> >> >> Materiaalweg 4 >> >> >> >> >> >> 5681 RJ Best >> >> T: >> >> +31 (0) 499 33 69 69 >> >> Postbus 440 >> >> E: >> >> [email protected] >> >> 5680 AK Best >> >> W: >> >> www.topicproducts.com >> >> The Netherlands >> >> >> Please consider the environment before printing this e-mail >> >> >> http://topic.nl/vacancy/topic-zoekt-technische-software-engineers/";>Topic >> zoekt gedreven (embedded) software specialisten! >> > > > -- > _______________________________________________ > meta-xilinx mailing list > [email protected] > https://lists.yoctoproject.org/listinfo/meta-xilinx > -- _______________________________________________ meta-xilinx mailing list [email protected] https://lists.yoctoproject.org/listinfo/meta-xilinx
