linux-kernel - Re: 2.6.24 still doesn't boot on i486..

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Date:	Fri, 4 Apr 2008 14:40:20 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.24 still doesn't boot on i486..

Michael Tokarev writes:
 > Just a follow-up on my earlier bugreport, when
 > 2.6.23 first come out....
 > 
 > 2.6.24 seems to not boot on i486-class hardware.
 > The machine reboots right after "Booting linux"
 > message.  2.6.22 was the last worked kernel.
 > 
 > The relevant config entries are:
 > 
 > CONFIG_TICK_ONESHOT=y
 > CONFIG_NO_HZ=y
 > CONFIG_HIGH_RES_TIMERS=y
 > CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
 > CONFIG_X86_PC=y
 > CONFIG_M486=y
 > CONFIG_X86_GENERIC=y
 > CONFIG_X86_CMPXCHG=y          <-- is it right?

yes

 > CONFIG_X86_L1_CACHE_SHIFT=7
 > CONFIG_X86_XADD=y
 > CONFIG_X86_PPRO_FENCE=y
 > CONFIG_X86_F00F_BUG=y
 > CONFIG_X86_WP_WORKS_OK=y
 > CONFIG_X86_INVLPG=y
 > CONFIG_X86_BSWAP=y
 > CONFIG_X86_POPAD_OK=y
 > CONFIG_X86_ALIGNMENT_16=y
 > CONFIG_X86_INTEL_USERCOPY=y
 > CONFIG_X86_MINIMUM_CPU_FAMILY=4
 > CONFIG_X86_UP_APIC=y
 > CONFIG_X86_UP_IOAPIC=y
 > CONFIG_X86_LOCAL_APIC=y
 > CONFIG_X86_IO_APIC=y
 > CONFIG_X86_MCE=y
 > CONFIG_X86_MCE_NONFATAL=y
 > CONFIG_X86_MCE_P4THERMAL=y
 > CONFIG_NOHIGHMEM=y
 > CONFIG_VMSPLIT_3G=y
 > 
 > Compiled with gcc (GCC) 4.2.3 (Debian 4.2.3-2).
 > 
 > This email is also a JFYI-style email.  Yesterday
 > I tried to debug this issue but discovered that the
 > power unit of that machine failed.  Well, it still
 > works and the machine boots, but at the same time
 > it smells like frosted/fried plastic ;)  So I don't
 > have i486 hardware anymore to test things on...
 > 
 > And now I wonder if I'm the only person in this world
 > with i486 machine... ;)

Just FYI, 2.6.23, 2.6.24 and 2.6.25-rc6 work fine on my i486DX4.

However, it's clear from your .config fragment above that you've
enabled features that cannot possibly exist on a 486 (APICs and
MCE for starters) and there may be bugs related to that. I suggest
trimming your .config and making it 486-specific.
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