This is the plan9.ini on my T61, for use with the latest 9front kernel. With these settings mp, Ethernet and USB all work (the integrated mouse button 2 does not work).:
bootfile=9pcf bootargs=local!/dev/sdE0/fscache nobootprompt=local!/dev/sdE0/fscache nvram=/dev/sdE0/nvram mouseport=ps2 monitor=vesa vgasize=1280x800x32 *msi=1 user=sl *mp=400 *mp0=00 00 14 03 fb 06 00 00 ff fb eb bf 00 00 00 00 *mp1=00 00 00 00 00 01 14 01 fb 06 00 00 ff fb eb bf *mp2=00 00 00 00 00 00 00 00 01 00 50 43 49 20 20 20 *mp3=01 03 50 43 49 20 20 20 01 15 50 43 49 20 20 20 *mp4=01 16 49 53 41 20 20 20 02 02 20 01 00 00 c0 fe *mp5=03 03 05 00 16 00 02 00 03 00 05 00 16 01 02 01 *mp6=03 00 05 00 16 00 02 02 03 00 05 00 16 03 02 03 *mp7=03 00 05 00 16 04 02 04 03 00 05 00 16 05 02 05 *mp8=03 00 05 00 16 06 02 06 03 00 05 00 16 07 02 07 *mp9=03 00 05 00 16 08 02 08 03 00 05 00 16 09 02 09 *mp10=03 00 05 00 16 0a 02 0a 03 00 05 00 16 0b 02 0b *mp11=03 00 05 00 16 0c 02 0c 03 00 05 00 16 0d 02 0d *mp12=03 00 05 00 16 0e 02 0e 03 00 05 00 16 0f 02 0f *mp13=04 03 05 00 16 00 ff 00 04 01 05 00 16 00 ff 01 *mp14=03 00 00 00 00 04 02 10 03 00 00 00 00 0D 02 11 *mp15=03 00 00 00 00 0E 02 12 03 00 00 00 00 64 02 14 *mp16=03 00 00 00 00 68 02 14 03 00 00 00 00 69 02 15 *mp17=03 00 00 00 00 6A 02 16 03 00 00 00 00 6D 02 11 *mp18=03 00 00 00 00 70 02 14 03 00 00 00 00 71 02 15 *mp19=03 00 00 00 00 72 02 16 03 00 00 00 00 73 02 17 *mp20=03 00 00 00 00 74 02 10 03 00 00 00 00 75 02 11 *mp21=03 00 00 00 00 76 02 12 03 00 00 00 00 77 02 13 *mp22=03 00 00 00 00 7D 02 10 03 00 00 00 00 7E 02 10 *mp23=03 00 00 00 03 00 02 11 03 00 00 00 15 00 02 10 *mp24=03 00 00 00 15 01 02 11 03 00 00 00 15 02 02 12 -sl
