Legacy ISA device probing involves poking at various I/O addresses to
guess whether or not a particular device is present.
Actual legacy ISA cards are essentially nonexistent by now, but the
probed I/O addresses have a habit of being reused for various
OEM-specific functions. This can cause some very undesirable side
effects. For example, probing for the "ne2k_isa" driver on an HP
Elitebook 840 G10 will cause the system to lock up in a way that
requires two cold reboots to recover.
Enable ISA_PROBE_ONLY in config/isa.h by default. This limits ISA
probing to use only the addresses specified in ISA_PROBE_ADDRS, which
is empty by default, and so effectively disables ISA probing. The
vanishingly small number of users who require ISA probing can simply
adjust this configuration in config/local/isa.h.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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