elanpar(4) - NetBSD Manual Pages

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elanpar(4)           NetBSD/i386 Kernel Interfaces Manual           elanpar(4)


NAME

     elanpar -- AMD Elan SC520 Programmable Address Regions


SYNOPSIS

     elansc* at mainbus? bus ?
     elanpar* at elansc?


DESCRIPTION

     The elanpar driver supports the write-protect feature of the AMD Elan
     SC520 microcontroller's integrated Programmable Address Regions.  Cur-
     rently, elanpar protects the kernel text from being overwritten by the
     CPU or errant DMA.


DIAGNOSTICS

     elanpar0: cpu violated write-protect window %u
     elanpar0: gp violated write-protect window %u
     elanpar0: pci violated write-protect window %u

     A Programmable Address Region stopped either the CPU, the general-purpose
     bus (gp), or a PCI bus master from writing to the indicated window of
     write-protected memory.

     elanpar0: %u bytes of kernel text are unprotected

     elanpar has not write-protected %u bytes of the kernel text.


SEE ALSO

     dmesg(8), elanpex(4), elansc(4), syslogd(8).


BUGS

     elanpar leaves as many as 65535 bytes unprotected at the beginning and
     end of kernel text.  Also, elanpar is not compatible with setting break-
     points using ddb(4).  Disable elanpar using drvctl -d elanpar0 before
     setting a breakpoint with ddb(4).


HISTORY

     The elanpar device first appeared in NetBSD 5.0.


AUTHORS

     The elanpar driver was written by David Young <dyoung@NetBSD.org>.

NetBSD 5.0.1                   January 10, 2008                   NetBSD 5.0.1