NAME
elanpar —
AMD Elan SC520 Programmable Address
Regions
SYNOPSIS
elansc* at mainbus? bus ?
elanpar* at elansc?
DESCRIPTION
Theelanpar driver supports the write-protect feature of
the AMD Elan SC520 microcontroller's integrated Programmable Address Regions.
Currently, 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
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 breakpoints
using ddb(4). Disable elanpar using
drvctl -d
elanpar0 before setting a breakpoint with
ddb(4).