CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED.
Result is shown for kernelversion 6.7-rc3

DTR_RI_DSR_CD_mixed_on_PA_and_PB

configname: CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED

Ser3 DTR, RI, DSR and CD assignment
└─>DTR_RI_DSR_CD_mixed_on_PA_and_PB
In linux kernel since version 2.6.12