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[isa] Disable legacy ISA device probing by default 

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>
pull/1437/head
Michael Brown 2025-03-29 23:01:21 +00:00
parent 4a7f64bf4f
commit 3937c893ae
1 changed files with 1 additions and 1 deletions
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2
src/config/isa.h
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@ -10,7 +10,7 @@
*
*/
#undef ISA_PROBE_ADDRS /* e.g. 0x200, 0x300 */
#undef ISA_PROBE_ONLY /* Do not probe any other addresses */
#define ISA_PROBE_ONLY /* Do not probe any other addresses */
#include <config/local/isa.h>