CONFIG_METAG_DA is not available for thedefaultarchitecture x86.
Result is shown for architecture metag

DA support

modulename: da.ko

configname: CONFIG_METAG_DA

Linux Kernel Configuration
└─>Processor type and features
└─>DA support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y if you plan to use a DA debug adapter with Linux. The presence
of the DA will be detected automatically at boot, so it is safe to say
Y to this option even when booting without a DA.

This enables support for services provided by DA JTAG debug adapters,
such as:
- communication over DA channels (such as the console driver).
- use of the DA filesystem.

source code:
is selected by
CONFIG_DA_TTY