Warning 099: Unable to determine the value of TDO series resistor {resistor} [on chain '{chain}']

Unable to determine the value of TDO series resistor resistor [on chain 'chain']. Check it is between the recommended values of minvalue and maxvalue.

There is a series resistor between the TDO of the final JTAG device in the chain and the TAP connector but its value is not specified or cannot be determined from the BOM data. If the project contains multiple chains then the name of the chain in question is reported, otherwise that portion of the message is omitted.