I believe that there is an error in the GreenPAK Serial Debugger user manual. The small connector is P2 and not P1.
https://www.mouser.com/datasheet/2/698/REN_um_gp_004_user_manual_greenpak_serial_debugger-3073563.pdf
Indeed, there is some confusion there... The BM04B-SRSS-TB(LF)(SN) connector is an SH series with 1.0 mm pitch, rather than 0.1"/2.54mm (as documented at https://www.farnell.com/datasheets/2082363.pdf).
The confusion runs deeper on the new "R2.0" version of the board, where the small SH connector is labelled "J3", and the big 0.1"/2.54mm KK Molex connector becomes "J2".
The attached R2.0 picture shows a SLG4DVKGSD purchased on August 25th from Farnell.Update: the Revision 2.1 of the documentation, directly from Renesas, uses correctly the new J2/J3 names, but the text is still wrong.https://www.renesas.com/us/en/document/mat/um-gp-004-greenpak-serial-debugger-user-manual