kernel can't find more than 64 Mb memory

[jOkEr]

 Hello.

 I have had a workstation with 64Mb memory and installed Debian/2.0.38
 kernel. Later I've inserted 128Mb DIMM (196Mb total). However kernel always
 "finds" 64Mb and no more. Same situation with 2.2.14.

 BIOS memory test - 100Mhz - 196 Mb OK.
 Windows 98 SE memory test - 100 Mhz - 196 Mb OK.
 BIOS memory test - 66Mhz - 196 Mb OK.
 Windows 98 SE memory test - 66 Mhz - 196 Mb OK.
 DIMM is HY, PC-133, 7.5 ns, even was tested with iP III 550e up 7xx
Mhz...So
 i think soft is the problem.

 Thanx.

 AlekS.