[Bug 234460] Can't boot after upgrade from 12-ALPHA10 to 12-STABLE(r342278)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234460

Toomas Soome <tsoome at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |tsoome at freebsd.org

--- Comment #3 from Toomas Soome <tsoome at freebsd.org> ---
The issue is identified.

This system does have buggy int13h ah=15h (read drive type), and even if we got
error from ah=08, we did end up mis-detecting the drive present. For
fix/workaround is, we only use ah=08 for floppy and we do not ignore return
value from it. Since ah=08 does not report sector size, we do need to set it
manually.

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