elanpar(4) - NetBSD Manual Pages

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

     i386/elanpex(4), i386/elansc(4), dmesg(8), syslogd(8)


HISTORY

     The elanpar device first appeared in NetBSD 5.0.


AUTHORS

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


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).

NetBSD 10.99                   February 17, 2017                  NetBSD 10.99