lumpi@dobag.in-berlin.de (Joern Lubkoll) (02/28/91)
hello, i use an Informtech 386- Motherboard with 33 mhz. The board is equipped with 16 Megabytes of Ram (4 MB SIMM on Board-80ns, 12 MB on Ram-Card in DIP - 70ns). After several minutes running interactive the Kernel dumps the Message: WARNING: Unknown NMI in System Mode - Unable to determine source of NMI If i degrade the board to 8 MB then the message won't occur !!! The Ram- Chips are all ok, because the board passes the memory test ! I urgently need an answer to this problem - Anybody else having it ? jl -- lumpi@dobag.in-berlin.de -- "Nothing is the complete absence of everything."
src@scuzzy.in-berlin.de (Heiko Blume) (03/02/91)
lumpi@dobag.in-berlin.de (Joern Lubkoll) writes: >hello, >i use an Informtech 386- Motherboard with 33 mhz. The board is equipped >with 16 Megabytes of Ram (4 MB SIMM on Board-80ns, 12 MB on Ram-Card in >DIP - 70ns). After several minutes running interactive the Kernel dumps >the Message: >WARNING: Unknown NMI in System Mode - Unable to determine source of NMI a parity error. if it happens more often you'll get something like WARNING: Kernel NMI trap: unable to determine source of NMI Parity error at: 0x0059B000 (0x00402000, 0xC059B000) NOTICE: Unexpected NMI in system mode! eventually, but not always. >If i degrade the board to 8 MB then the message won't occur !!! The Ram- >Chips are all ok, because the board passes the memory test ! don't trust the el-cheapo bios ram tests. run somethink like checkit (a DOS test program) for several days at least. another cause can be setting the DMA speed and/or BUSON/OFF parameters for adaptec (and others probably) scsi host adapters that do bus master DMA. in this case no ram test will discover anything, of course. be VERY careful with stuff like this, you can seriously f*ck up your filesystem(s) when you get a NMI during dangerous operations like superblock or fdisk table updates. -- Heiko Blume <-+-> src@scuzzy.in-berlin.de <-+-> (+49 30) 691 88 93 public UNIX source archive [HST V.42bis]: scuzzy Any ACU,f 38400 6919520 gin:--gin: nuucp sword: nuucp uucp scuzzy!/src/README /your/home