CONFIG_MPC8xx_SECOND_ETH_SCC3 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

SCC3

configname: CONFIG_MPC8xx_SECOND_ETH_SCC3

Second Ethernet channel
└─>SCC3
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enable SCC3 to serve as 2-nd Ethernet channel. Note that SMC1
(often 1-nd UART) will not work if this is enabled.