The latter, but also 2.11bsd does not have virtual memory, and thus does not require an MMU. It was written with the segmentation features of a PDP-11 in mind,

The latter, but also 2.11bsd does not have virtual memory, and thus does not require an MMU. It was written with the segmentation features of a PDP-11 in mind, which so happen to adapt to PIC32 as it has kernel/user separation and memory protection via a kseg/useg segmentation (as opposed to a TLB with individual page protections).