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Date:      Sat, 9 Jan 1999 12:57:13 +0000 (GMT)
From:      Doug Rabson <dfr@nlsystems.com>
To:        Wilko Bulte <wilko@yedi.iaf.nl>
Cc:        FreeBSD-alpha mailing list <freebsd-alpha@FreeBSD.ORG>
Subject:   Re: porting to EB64+ / Alpine
Message-ID:  <Pine.BSF.4.01.9901091253270.391-100000@herring.nlsystems.com>
In-Reply-To: <199901090024.BAA09214@yedi.iaf.nl>

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On Sat, 9 Jan 1999, Wilko Bulte wrote:

> I hacked a bit on the EB64+ bits taken from NetBSD and I am as far as
> getting:
> 
> boot: ethernet address: 00:00:f8:20:7f:45
> netbbinfo invalid
> boot: ethernet address: 00:00:f8:20:7f:45
> netbbinfo invalid
> boot: ethernet address: 00:00:f8:20:7f:45
> /kernel data=0x1de1d8+0x27e60 syms=[0x8+0x405d8+0x8+0x2bcd2]
> Entering kernel at 0xfffffc0000320500...
> Copyright (c) 1992-1999 FreeBSD Inc.
> Copyright (c) 1982, 1986, 1989, 1991, 1993
>         The Regents of the University of California. All rights reserved.
> FreeBSD 3.0-CURRENT #1: Wed Dec 30 22:07:15 CET 1998
>     root@axp33.iaf.nl:/usr/src/sys/compile/ALPINE
> EB64+
> Alpha 21064A Evaluation Board 274 MHz, 274MHz
> 8192 byte page size, 1 processor.
> CPU: EV45 (21064A) major=6 minor=2
> OSF PAL rev: 0x100070002012d
> real memory  = 65028096 (63504K bytes)
> avail memory = 58335232 (56968K bytes)
> Preloaded elf kernel "kernel" at 0xfffffc0000576000.
> apecs0: <DECchip 21072 Core Logic chipset>
> isa0
> Probing for devices on PCI bus 0:
> ncr0: <ncr 53c810 fast10 scsi> rev 0x01 int a irq 7 on pci0.5.0
> de0: <Digital 21040 Ethernet> rev 0x23 int a irq 0 on pci0.6.0
> de0: DEC 21040 [10Mb/s] pass 2.3
> de0: address 00:00:f8:20:7f:45
> vga0: <S3 Trio 64 graphics accelerator> rev 0x16 int a irq 1 on pci0.7.0
> chip0: <Intel 82378ZB PCI to ISA bridge> rev 0x03 on pci0.8.0
> mcclock0: <MC146818A real time clock> at port 0x70-0x71 on isa0
> sc0 at port 0x60-0x6f irq 1 on isa0
> sc0: CGA <16 virtual consoles, flags=0x0>
> sio0 at port 0x3f8-0x3ff irq 4 on isa0
> sio0: type 16550A
> sio1: reserved for low-level i/o
> panic: possible stack overflow
> 
> panic
> Stopped at      Debugger..ng+0x24:      ldq     ra,0(sp)
> <0xfffffc0000578230>   <ra=0xfffffc00004
> 698b8,sp=0xfffffc0000578230>
> db> 
> 
> I have also seen 'panic: clock not attached'. As I'm trying to find my way
> around in the kernel source tree I appreciate any hints.

This usually happens if an interrupt is enabled but not handled.  The
interrupt exception tries to return but is immediately reentered with a
few bytes less stack.

You would get the "clock not attached" if mcclock isn't probed properly
but I can see that its present in your dmesg.  Strange.

--
Doug Rabson				Mail:  dfr@nlsystems.com
Nonlinear Systems Ltd.			Phone: +44 181 442 9037



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