Copyright (c) 2008 David Young. All rights reserved.
Written by David Young.
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.Dd February 17, 2017 .Dt ELANPAR 4 i386 .Os .Sh NAME .Nm elanpar .Nd AMD Elan SC520 Programmable Address Regions .Sh SYNOPSIS .Cd "elansc* at mainbus? bus ?" .Cd "elanpar* at elansc?" .Sh DESCRIPTION The .Nm driver supports the write-protect feature of the AMD Elan SC520 microcontroller's integrated Programmable Address Regions. Currently, .Nm protects the kernel text from being overwritten by the CPU or errant DMA. .Sh DIAGNOSTICS l -diag t elanpar0: cpu violated write-protect window %u t elanpar0: gp violated write-protect window %u t elanpar0: pci violated write-protect window %u .El
p A Programmable Address Region stopped either the CPU, the general-purpose bus
q gp , or a PCI bus master from writing to the indicated window of write-protected memory. l -diag t elanpar0: %u bytes of kernel text are unprotected .El
p .Nm has not write-protected .Em %u bytes of the kernel text. .Sh SEE ALSO .Xr i386/elanpex 4 , .Xr i386/elansc 4 , .Xr dmesg 8 , .Xr syslogd 8 .Sh HISTORY The .Nm device first appeared in .Nx 5.0 . .Sh AUTHORS The .Nm driver was written by .An David Young Aq Mt dyoung@NetBSD.org . .Sh BUGS .Nm leaves as many as 65535 bytes unprotected at the beginning and end of kernel text. Also, .Nm is not compatible with setting breakpoints using .Xr ddb 4 . Disable .Nm using c drvctl Fl d Ar elanpar0 before setting a breakpoint with .Xr ddb 4 .