Hi Steve, your patch commit c5b367835cfc7a8ef53b9670a409ffcc95194344 ("MIPS: Add support for XPA") breaks userspace on my Alchemy systems, everything is killed with error -14: Kernel panic - not syncing: Requested init /bin/sh failed (error -14). Reverting that patch fixes everything. I bet it's related to the 36bit address space in some way. Thanks! Manuel