> On 20 Apr 2017, at 10:48, Dr. Philipp Tomsich > <philipp.toms...@theobroma-systems.com> wrote: > >> On 20 Apr 2017, at 10:44, Kever Yang <kever.y...@rock-chips.com> wrote: >> >> Hi Philipp, >>> >>> >>> Do you know if this is required for all board designs? >>> We have a total run length of less than 2cm to the KSZ9031 PHY and wondered >>> about this ourselves—our testing has shown that with these small distances >>> (and the PHY we use) the setting doesn’t seem to be required. >> >> If your layout is very good, it might work without this patch, did you test >> with 1000M Ethernet on many boards? >> With patch, we can keep the setting with kernel and make sure all the >> hardware able to work at 1000M mode. >> The firefly-rk3399 and rockchip rk3399-evb can't work at 1000M Ethernet mode >> without this patch. > > Yes, we have full GbE in U-Boot (without this change) across the entire board > population of our initial batch. > This is most likely due to the very short distance between the RK3399 and PHY > (there isn’t really an alternative > to having it close due to the size constraints of the module).
Just for completeness, Linux with default drive strength (&pcfg_pull_none) works on puma-rk3399 too. Tested with iperf3 we get about 935Mbit with zero RX/TX errors. Regards, Klaus _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
