On Mon, Jan 09, 2017 at 05:38:39PM -0500, Murali Karicheri wrote:
> Hello Charles-Antoine, Andrew,
>
> We have recently upgraded our kernel to v4.9 and started seeing an issue
> on our Keystone EVMs (K2E/L) that uses Marvel Phy 1510. The issue is that
> when we do a reboot command from the Linux console or do a SoC reset,
> the DHCP times out at U-Boot due to Phy auto negotiation failure. This works
> fine when the board is power cycled.
I've seen similar before. What version of kernel are you upgrading
from?
The problem i've had is that on shutdown/reboot, linux powers the PHYs
off. The uboot i have does not power them on again. Clearly a uboot
issue, it should not assume the PHYs are powered on.
I work around this with a uboot command:
mii write 1 0 0x3100
where the PHY is at address 1 on the bus. This writes to register 0,
and the import bit which needs setting to 0 is bit 11.
If mii read shows bit 11 is set, you know there uboot did not power up
the PHY.
Andrew
