In D11177#233055, @ian wrote:

I get a runtime KASSERT:

ahci0: <i.MX6 Integrated AHCI controller> mem 0x2200000-0x2203fff irq 14 on simplebus0
panic: imx_iomux_gpr_get bad regnum 52, max 13

This is because imx_iomux_gpr_get() wants the simple register number (0-13), not the IOMUX_GPR13 constant which is the offset of the register in mmio space. (Yet another reason why I've come to hate the existance of fooreg.h files; all that stuff is private to the corresponding foo.c file, and should just be defined in there, imo).

After fixing that in the code I've now got the driver running on a wandboard and it seems to be working great. Thanks for submitting this, it can be committed as soon as we tidy up the minor style stuff.

Added more diff context

Here is a presentation from bapt in BSDCan 2015: http://pres.gandi.net/downloads/FreeBSD-packaging-base.pdf
Also, the wiki has some content: https://wiki.freebsd.org/PkgBase, though the wiki is mostly on how to use and not how to package a prog or lib.

All libraries are individual packages with the exception of libzfs which in fact includes three: libzfs, libzfs_core and libzpool which are directly related. I did this way because it seemed to be pattern on the lib subdir where all libraries are in lib${LIB} package, with the exception of C and C++ standard libraries which reside in a clibs package.