On Fri, Nov 6, 2015 at 6:22 PM, Michael Welling <mwell...@ieee.org> wrote: > Lets try this again with list membership. > > I have run into an issue with a KSZ9031 Gigabit Ethernet PHY on an IMX6 > module. > > After booting into Linux and rebooting the ethernet fails consistently. > > With a bit of investigation I found that the power-down bit in the PHY control > register is being set on reboot. > > => dhcp > BOOTP broadcast 1 > BOOTP broadcast 2 > BOOTP broadcast 3 > BOOTP broadcast 4 > BOOTP broadcast 5 > . > . > Abort > => mii dump 1 0 > 0. (1940) -- PHY control register -- > (8000:0000) 0.15 = 0 reset > (4000:0000) 0.14 = 0 loopback > (2040:0040) 0. 6,13 = b10 speed selection = 1000 Mbps > (1000:1000) 0.12 = 1 A/N enable > (0800:0800) 0.11 = 1 power-down > (0400:0000) 0.10 = 0 isolate > (0200:0000) 0. 9 = 0 restart A/N > (0100:0100) 0. 8 = 1 duplex = full > (0080:0000) 0. 7 = 0 collision test enable > (003f:0000) 0. 5- 0 = 0 (reserved) > > When I manually toggle the power down bit it starts to work again. > > => mii write 1 0 1140 > => dhcp > FEC Waiting for PHY auto negotiation to complete........ done > BOOTP broadcast 1 > DHCP client bound to address 192.168.0.12 (62 ms) > > I tried performing the above steps in the PHY driver code with little luck. > > When I toggle the bit in the code the first dhcp always fails but then it > works on subsequent attempts. > > Any ideas? > Has anyone else seen this issue with other PHYs?
Could you try to revert 59370f3fc as suggested here? https://www.mail-archive.com/u-boot@lists.denx.de/msg191196.html _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
