default or selected kernelversion does not have config value CONFIG_IBM_NEW_EMAC_RGMII.
Result is shown for kernelversion 6.2.5
CONFIG_IBM_NEW_EMAC_RGMII (not configurable)
configname: CONFIG_IBM_NEW_EMAC_RGMII
Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>IBM_NEW_EMAC_RGMII