Help: X does not run on REVTO486 high speed mode

Help: X does not run on REVTO486 high speed mode

Post by Jixiang Zh » Thu, 21 Dec 1995 04:00:00

I bought a REVTO486 upgrade chip from Evergreen technologies to upgrade my
386DX-25 running linux.  REVTO486 is a TI486SXL2-50 which I believe is something
similar to Cyrix 386-486 hybrid chip with 8kb L1 cache.  Unlike a 486DX, the chip
does not have an on-chip math coprocessor.  It came with a dos software called
486cache.exe which I run in DOS to set the chip to run at either 25 Mhz or 50Mhz.  

   I run this program in DOS then I use LOADLIN to boot up linux.  At 25 Mhz,
everything runs fine with linux.  But at 50 Mhz, X does not run!  I got a message
says floating point error.  I thought the problem might be that the system think
the cpu is a real 486 and try to use the on-chip math coprocessor.  So I
recompiled the kernal with no 486 optimization.  It did not help.  Any help is
greatly appreciated.

   Here is my system configuration.

REVTO486: Ti486SXL2-50
running at 50 Mhz with cache on (Bogomips=19.85)
ruuning at 25 Mhz with cache on (Bogomips=9.8)
running at 25 Mhz with cache off(Bogomips=7.1)

intel 387 math coprocessor
Trident 8900c SVGA with 1 MB
Micronics motherboard

Jixiang Zhu


1. SiS 6205 & high high resolution modes

I have installed the 3.1.2F beta release of the X server and I have managed
to configure it to run with my SiS 6205 video card using the
'chipset 86c201'(!) keyword -the server won't recognize chipset 86c205-, but
only in the 640x480 mode. I'm sure that I'm using the right card clock and the
correct frequencies for my monitor, but I'm still unable to get the 800x600
mode. Does anyone know how to solve this problem? Does the 'G' release
fix this?

                                Thanks in advance
                                Pedro Gomez

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