SVSTATE contains the Sub-PC and needs to be given the same peer status as PC. that means adding to DMI and JTAG.
automatically gets added to JTAG which is pass-through on DMI
commit 4d5482810c980ff927ccec62968a40a490ea86eb (HEAD -> master, origin/master)
Author: Luke Kenneth Casson Leighton <firstname.lastname@example.org>
Date: Sun Mar 7 15:05:24 2021 +0000
add SVSTATE read to DMI interface