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Recent AMD CPUs (SMBus PCI revision ID >= 0x51) can disable port-mapped IO and only support memory-mapped IO. In practice this was observed on a Zen 3 CPU where PMIO reads all returned 0xff. Update the driver to use MMIO for these processors while continuing to use PMIO by default. Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/1437 |
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| amd_chipset.h | ||
| amdsbwd.c | ||