Matrox (yes, the graphics card company) sold a PCI board with several PowerPC "G4" chips that ran little-endian Linux. They posted a smallish kernel patch for t

Matrox (yes, the graphics card company) sold a PCI board with several PowerPC "G4" chips that ran little-endian Linux. They posted a smallish kernel patch for this. MC/OS and Windows NT 4.0 also ran little-endian on PowerPC. The hardware support was simple: swap all 8 byte lanes for every memory access. It only mattered when MMIO or DMA was involved, so a software-only alternative was to have the OS do that -- but disk access via DMA would make the software solution impractical.