TSEC_ID2 register is read-only and reflects the external interface options
available for it's TSEC. eTSEC2 on P1010 has no dedicated pins thus
it is correct that neither full (GMII) nor reduced (RGMII) is available
for it. Software should not attempt to alter this register. eTSEC
register settings for different interface modes are specified in
P1010RM, Table 15-228. A good discussion of SGMII initialization can
be found in in AN3869:
https://www.nxp.com/webapp/Download?colCode=AN3869&location=null&fsrch=1&sr=3&pageNum=1&Parent_nodeI...
Have a great day,
Platon
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