HLD: SPC-6 ASIC SerDes precoding via media_settings.json#2320
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Add HLD describing precoding configuration for SPC-6 platforms while
APSU is not yet supported by module firmware. The flow reuses the
standard SONiC SI pipeline:
media_settings.json -> xcvrd -> APP_DB:PORT_TABLE -> orchagent -> SAI
- Two new per-lane fields, tx_precoding / rx_precoding, are added to
media_settings.json under the existing speed:<lane_speed_key> blocks.
- xcvrd requires no code change (parser is field-agnostic).
- orchagent (PortsOrch) maps the fields to
SAI_PORT_SERDES_ATTR_{TX,RX}_PRECODING.
- sonic-device-data's media_checker is extended to accept the new keys
so the build-time validator does not reject them.
Tracking: FR #4867218.
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