diff options
| -rw-r--r-- | sys/i386/conf/NOTES | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index 729d979..ac2e35e 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -22,20 +22,27 @@ profile 2 ##################################################################### # SMP OPTIONS: # -# The apic device enables the use of the IO APIC for Symmetric I/O. +# The apic device enables the use of the I/O APIC for Symmetric I/O. # # Notes: # -# An SMP kernel will ONLY run on an Intel MP spec. qualified motherboard. -# -# Be sure to disable 'cpu I386_CPU' && 'cpu I486_CPU' for SMP kernels. +# Be sure to disable 'cpu I386_CPU' for SMP kernels. # # Check the 'Rogue SMP hardware' section to see if additional options # are required by your hardware. # +# By default, mixed mode is used to route IRQ0 from the AT timer via +# the 8259A master PIC through the ExtINT pin on the first I/O APIC. +# This can be disabled via the NO_MIXED_MODE option. In that case, +# IRQ0 will be routed via an intpin on the first I/O APIC. Not all +# motherboards hook IRQ0 up to the first I/O APIC even though their +# MP table or MADT may claim to do so. That is why mixed mode is +# enabled by default. +# # Mandatory: device apic # I/O apic +options NO_MIXED_MODE # Disable use of mixed mode # # Rogue SMP hardware: |
