when I delete the console in UBoot (console=NULL) and restart my target, the Ethernet ports does not work.
It is important to turn off/on the power supply for the restart.
my research allowed me to understand that it is the registry CCM_CCGR0 that is not well configured.
When the eternet is ok: CCM_CCGR0 = 0xC0C0330F
When the eternet does not work: CCM_CCGR0 = 0xC0C0030F
dmesg: " fec 2188000.ethernet eth0: Unable to connect to phy "
But, I don't know why and how to correct this difference.
Kernel Linux: 4.14.11
Thank you for your help.