the sd raw file is one of the really cool things about plan 9. while the raw file works pretty well on ata devices, there are some things you can't get.
so i spent a little bit working out this problem. there is a paper at http://www.quanstro.net/plan9/atazz.pdf i promise this link is legal. it may also resolve. the current implementation is in these files in /n/sources/contrib/quanstro/src/9/^(pc/ahci.h pc/sd*.[ch] pc/fis.[ch] port/devsd.c port/sd.h) i have modified my pccpu configuration file with these lines instead of the original. sdiahci pci sdscsi fis sdaoe sdata pci sdscsi fis sdmv50xx pci fis astute readers will notice that all ata drivers were also modified to support 48-bit lbas. there are also some fixes for recently-reported ahci problems. the implementation has a few rough edges, but i thought that it was important to get feedback. papers and code are easy to modify. - erik
