PCI MSI interrupt handling

HiFive Unmatched
1

I found following declarations in FU740-C000 manual:

Memory map:
0x0202_0000 0x0202_0FFF rw a MSI

PLIC Interrupt Source Mapping:
1 10 MSI

Is it related to PCI MSI interrupt handling? Are there any documentation for this ranges?

Linux kernel seems not use this ranges and use one MSI IRQ for dispatching MSI interrupts.