This is a simple command line utility decoding ranges property of PCI bridges device tree node. The interpretation of these cells is here.
$ pci-range 0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0x3f000000
PciAddress: MMIO32(0x41000000)
PhysicalAddress: 0x0000000041000000
Size: 0x3f000000
relocatable: false, prefetchable: false, aliased: false
The ranges property of PCI host bridge is grouped by seven cells.