667c3fc0f6
Platform (N1SDP). Neoverse N1 is a high-performance ARM microarchitecture designed by the ARM Holdings for the server market. The PCI part on N1SDP was shipped untested and suffers from some integration issues. For instance accessing to not existing BDFs causes System Error (SError) exception. To mitigate this, the firmware scans the bus, catches SErrors and creates a table with valid BDFs. That allows us to filter-out accesses to invalid BDFs in this driver. Also the root complex config space (BDF == 0) has an unusual location in memory map, so remapping accesses to it is required. Finally, the config space is restricted to 32-bit accesses only. This was tested on the ARM boxes kindly provided by the ARM Ltd to the DARPA CHERI Project. In collaboration with: andrew Reviewed by: andrew Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D23349 |
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