With M586 it also boots. Enclosed is the dmesg , if of any importance (ignore that the kernel is named -i486, this is only because I don't want to rename everything, hoping that soon M486 returns to work). Below is also the diff which config's are changed implicitely on changing from M486 to M586 . Thus, the problem is between M486 and M586 , compiled with 486 it don't boot, but compiled for 586 it boots. Alias, M686 runs the whole day without any other problems. You can suggest me now a next config to try out for better find the reason for the problem. wl ============================================================= bash-4.1# cd /boot bash-4.1# diff .config config 3c3 < # Linux/i386 3.1.0-rc5 Kernel Configuration --- > # Linux/i386 3.1.0-rc6 Kernel Configuration 303,304c303,304 < CONFIG_M486=y < # CONFIG_M586 is not set --- > # CONFIG_M486 is not set > CONFIG_M586=y 336d335 < CONFIG_X86_INVD_BUG=y 383a383 > # CONFIG_HIGHMEM64G is not set bash-4.1# ============================================================= On Wed, 14 Sep 2011 08:35:44 -0700 Linus Torvalds wrote: > On Wed, Sep 14, 2011 at 5:56 AM, werner > wrote: >> Now, for find out what exactly is the reason why it dont >>boot with 486, you >> can give me suggestions which CONFIG excatly perhaps to >>disable, instead of >> 486. > > Try M586 next ("586/K5/5x86/6x86/6x86MX"). If that >works, that narrows > it down to M486->M586. > > And if that *doesn't* work, try M586TSC >("Pentium-Classic") and then > M586MMX ("Pentium-MMX") to see exactly where it breaks.. > > Linus > > "werner" --- Professional hosting for everyone - http://www.host.ru