05-10-2007
Kernel panic - not syncing: cannot execute a PAE-enabled kernel on PAE-less CPU
ok so I just installed fedora core 6 on my dell inspiron 700m and I go to boot into linux and I get this error. Has anyone seen this before?
I also had XP Pro and Vista installed on this pc prior to putting fedora core 6 on the machine. I'm trying to setup a triple boot system.
Please Help
This is the error message:
Kernel panic - not syncing: cannot execute a PAE-enabled kernel on PAE-less CPU
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PAE(4) BSD/i386 Kernel Interfaces Manual PAE(4)
NAME
PAE -- Physical Address Extensions
SYNOPSIS
options PAE
DESCRIPTION
The PAE option provides support for the physical address extensions capability of the Intel Pentium Pro and above CPUs, and allows for up to
64 gigabytes of memory to be used in systems capable of supporting it. With the PAE option, memory above 4 gigabytes is simply added to the
general page pool. The system makes no distinction between memory above or below 4 gigabytes, and no specific facility is provided for a
process or the kernel to access more memory than they would otherwise be able to access, through a sliding window or otherwise.
SEE ALSO
smp(4), tuning(7), config(8), bus_dma(9)
HISTORY
The PAE option first appeared in FreeBSD 4.9 and FreeBSD 5.1.
AUTHORS
Jake Burkholder <jake@FreeBSD.org>
BUGS
Since KLD modules are not compiled with the same options headers that the kernel is compiled with, they must not be loaded into a kernel com-
piled with the PAE option.
Many devices or their device drivers are not capable of direct memory access to physical addresses above 4 gigabytes. In order to make use
of direct memory access IO in a system with more than 4 gigabytes of memory when the PAE option is used, these drivers must use a facility
for remapping or substituting physical memory which is not accessible to the device. One such facility is provided by the busdma interface.
Device drivers which do not account for such devices will not work reliably in a system with more than 4 gigabytes of memory when the PAE
option is used, and may cause data corruption. The PAE kernel configuration file includes the PAE option, and explicitly excludes all device
drivers which are known to not work or have not been tested in a system with the PAE option and more than 4 gigabytes of memory.
Many parameters which determine how memory is used in the kernel are based on the amount of physical memory. The formulas used to determine
the values of these parameters for specific memory configurations may not take into account the fact there may be more than 4 gigabytes of
memory, and may not scale well to these memory configurations. In particular, it may be necessary to increase the amount of virtual address
space available to the kernel, or to reduce the amount of a specific resource that is heavily used, in order to avoid running out of virtual
address space. The KVA_PAGES option may be used to increase the kernel virtual address space, and the kern.maxvnodes sysctl(8) may be used
to decrease the number of vnodes allowed, an example of a resource that the kernel is likely to overallocate in large memory configurations.
For optimal performance and stability it may be necessary to consult the tuning(7) manual page, and make adjustments to the parameters docu-
mented there.
BSD
April 8, 2003 BSD