diff --git a/sys/arch/mvme68k/README.VMEbus-RAM b/sys/arch/mvme68k/README.VMEbus-RAM index 3c8552eacd93..230ca26a4e5d 100644 --- a/sys/arch/mvme68k/README.VMEbus-RAM +++ b/sys/arch/mvme68k/README.VMEbus-RAM @@ -1,4 +1,4 @@ - $NetBSD: README.VMEbus-RAM,v 1.1 1997/10/12 15:45:12 scw Exp $ + $NetBSD: README.VMEbus-RAM,v 1.2 1997/11/01 19:18:39 scw Exp $ NetBSD/mvme68k port: VMEbus RAM card configuration @@ -62,20 +62,6 @@ onboard RAM and will not attempt to use any VMEbus RAM. Some extra notes on VMEbus RAM cards ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Most VMEbus RAM cards support parity checking in some form or another. -This can cause problems with the kernel. It's fairly normal for a card -to only initialise the parity bit on write accesses. This means that -the card can generate lots of parity errors following power-up. What's -happening is that NetBSD doesn't zero the RAM's contents on boot-up -so there's stale (and probably incorrect) parity data in the card. - -If this happens with your card, try block-filling the card with zero -from the 147Bug> prompt (see the 'BF' command) before booting NetBSD. -If that cures the problem, see if there's a jumper on the RAM card to -disable parity checking. If not, you might have no choice but to block- -fill the memory following a power-up. - - So... You've got your nice shiny VMEbus RAM card up and running with NetBSD, and you're wondering why your system runs slower than it did with less RAM!