Update the note about the need for COMPAT_FREEBSD<n> kernel options.
Rather than mentioning the requirement for 4.x binaries but not explaining why (it was assuming an upgrade from 4.x to 5.0-current), explain when compat options are needed (for running existing host binaries) in a more general way while using a more modern example (COMPAT_FREEBSD11 for 11.x binaries). While here, explicitly mention that a GENERIC kernel should always work. Reported by: Robert Huff <roberthuff@rcn.com> Reviewed by: imp MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D18740
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UPDATING
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UPDATING
@ -1901,12 +1901,13 @@ COMMON ITEMS:
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can be deleted by "make delete-old-libs", but you have to make
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can be deleted by "make delete-old-libs", but you have to make
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sure that no program is using those libraries anymore.
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sure that no program is using those libraries anymore.
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[8] In order to have a kernel that can run the 4.x binaries needed to
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[8] The new kernel must be able to run existing binaries used by
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do an installworld, you must include the COMPAT_FREEBSD4 option in
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an installworld. When upgrading across major versions, the new
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your kernel. Failure to do so may leave you with a system that is
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kernel's configuration must include the correct COMPAT_FREEBSD<n>
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hard to boot to recover. A similar kernel option COMPAT_FREEBSD5 is
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option for existing binaries (e.g. COMPAT_FREEBSD11 to run 11.x
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required to run the 5.x binaries on more recent kernels. And so on
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binaries). Failure to do so may leave you with a system that is
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for COMPAT_FREEBSD6 and COMPAT_FREEBSD7.
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hard to boot to recover. A GENERIC kernel will include suitable
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compatibility options to run binaries from older branches.
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Make sure that you merge any new devices from GENERIC since the
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Make sure that you merge any new devices from GENERIC since the
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last time you updated your kernel config file.
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last time you updated your kernel config file.
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