Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/sdahciich7/readme

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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improvements
1.  recognize any amd or intel part with the proper programming interface.

bug fixes
1.  properly recognize new media
2.  fix deadlocks when drives aren't responding.  (cf, d->active)
3.  properly deal with skipped ports.  for example, some chipsets
disable ports 0, 1 but enable port 2.  this resulted in unacknowleged
interrupts & hung machines.
4.  when a drive is removed, force d->sectors = 0.

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