Implementing rv64 for the sodor core: Purpose of SodorScratchpadAdapter's restriction to 32-bit addresses?

[viniul]

I am trying port the sodor core to rv64 -- However, I am stumbling upon the line with hardcoded size of 32-bits:

require(io.slavePort.req.bits.addr.getWidth == 32, "Slave port only support 32 bit address")

in generators/riscv-sodor/src/main/scala/sodor/common/scratchpad_adapter.scala, class SodorScratchpadAdapter.

Could you point to more documentation regarding the adapter and the reason behind this line of code? A simple XLEN and SystemBusKey change in the sodor core triggered this assertion -- but I struggle to find the context behind the adapter's restriction to a 32-bit wide address.