Date: Thu, 10 Apr 2003 16:34:58 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Erik Trulsson <ertr1013@student.uu.se> Cc: freebsd-hackers@freebsd.org Subject: Re: Anyone seen 4.8-RELEASE running on a real 386 (not 486 586 etc) ? Message-ID: <XFMail.20030410163458.jhb@FreeBSD.org> In-Reply-To: <20030410193810.GA52024@falcon.midgard.homeip.net>
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On 10-Apr-2003 Erik Trulsson wrote:
> On Thu, Apr 10, 2003 at 08:43:04PM +0200, Julian Stacey wrote:
>> freebsd-hackers@,
>> Anyone seen 4.8-RELEASE running on a real 386 processor (not a 486, 586 etc) ?
>>
>> I have a 386 that runs 4.7, dmesg below, both GENERIC & my own kernel;
>> But it wont boot 4.8 { either generic or my own config } compiled on my
>> other 4.8 box. I tried making with & without /etc/make.conf
>> CFLAGS = -m386 -march=i386 -msoft-float -mcpu=i386 -O -pipe
>> COPTFLAGS= -m386 -march=i386 -msoft-float -mcpu=i386 -O -pipe
>> I tried the /kernel copied from a 4.8 cdrom to hard disk (no cdrom
>> drive on the box). I tried 4.8 boot floppies (to prove its not
>> something wrong in hard disc /boot) Every 4.8 kernel crashes during boot -s.
>>
>> This 386 box is no bigger than a book, so worth persevering :-)
>> "SX 33" is written on chip, though dmesg reports "DX".
>>
>> I recall 386 support was dropped in 5.0, but presume not dropped in 4.8,
>> ( I don't see any signs in /usr/share/mk comparing 4.7 & 4.8 )
>> The 4.8 cdrom /[A-Z]* files say i386 is still supported.
>>
>> I removed the only card in the box (a 3com ISA ethernet jumperless) -
>> it still wouldnt boot, so put ethernet card back in, as not the problem.
>>
>> I compiled a kernel with ddb, Results copied by hand as no serial for
>> remote gdb.t present
>>
>> Ideas or solutions anyone ?
>>
>> 4.8 ddb:
>> Fatal trap 1: priveleged instruction fault while in kernel mode
>> instruction pointer = 0x8:0xc02695a0
>> stack pointewr = 0x10:0xc0379fcc
>> frame pointer = 0x10:0xc0379fcc
>> code segment = base 0x0, limit 0xfffff, type 0x1b
>> = DPL 0, pres 1, def 32 1, gran 1
>> processor eflags = interrupt enabled, resume, IOPL = 0
>> current process = Idle
>> interrupt mask = net tty bio cam
>> kernel: type 1 trap, code=0
>> stopped at 0xc02695a0: invlpg 0(%ecx)
>
> Try the following patch.
> Makes my 386sx/33 work fine at least.
> (Without it I get the same panic as you do.)
Oh my, I hope that isn't it. If so it's my fault. :(
Hmm, can you try this patch instead?
http://www.FreeBSD.org/~jhb/patches/4x_386.patch
Index: identcpu.c
===================================================================
RCS file: /usr/cvs/src/sys/i386/i386/identcpu.c,v
retrieving revision 1.80.2.14
diff -u -r1.80.2.14 identcpu.c
--- identcpu.c 22 Jan 2003 20:14:52 -0000 1.80.2.14
+++ identcpu.c 10 Apr 2003 20:30:56 -0000
@@ -64,6 +64,7 @@
/* XXX - should be in header file: */
void printcpuinfo(void);
void finishidentcpu(void);
+void earlysetcpuclass(void);
#if defined(I586_CPU) && defined(CPU_WT_ALLOC)
void enable_K5_wt_alloc(void);
void enable_K6_wt_alloc(void);
@@ -942,6 +943,21 @@
return;
}
}
+}
+
+/*
+ * This routine is called specifically to set up cpu_class before
+ * startrtclock() uses it. Probably this should be rearranged so that
+ * startrtclock() doesn't need to run until after identifycpu() has been
+ * called. Another alternative formulation would be for this routine
+ * to do all the identification work, and make identifycpu() into a
+ * printing-only routine.
+ */
+void
+earlysetcpuclass(void)
+{
+
+ cpu_class = i386_cpus[cpu].cpu_class;
}
static void
Index: machdep.c
===================================================================
RCS file: /usr/cvs/src/sys/i386/i386/machdep.c,v
retrieving revision 1.385.2.29
diff -u -r1.385.2.29 machdep.c
--- machdep.c 4 Apr 2003 22:21:29 -0000 1.385.2.29
+++ machdep.c 10 Apr 2003 20:30:53 -0000
@@ -122,6 +122,7 @@
extern void dblfault_handler __P((void));
extern void printcpuinfo(void); /* XXX header file */
+extern void earlysetcpuclass(void); /* same header file */
extern void finishidentcpu(void);
extern void panicifcpuunsupported(void);
extern void initializecpu(void);
@@ -265,6 +266,7 @@
* Good {morning,afternoon,evening,night}.
*/
printf("%s", version);
+ earlysetcpuclass();
startrtclock();
printcpuinfo();
panicifcpuunsupported();
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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