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Nicholas Piggin
6b56bb6dbc
Each non-core chiplet on a chip has a "pervasive chiplet" unit and its xscom register set. This adds support for PHB4/5. skiboot reads the CPLT_CONF1 register in __phb4/5_get_max_link_width(), which shows up as unimplemented xscom reads. Set a value in PCI CONF1 register's link-width field to demonstrate skiboot doing something interesting with it. In the bigger picture, it might be better to model the pervasive chiplet type as parent that each non-core chiplet model derives from. For now this is enough to get the PHB registers implemented and working for skiboot, and provides a second example (after the N1 chiplet) that will help if the design is reworked as such. Signed-off-by: Nicholas Piggin <npiggin@gmail.com>