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Message-ID: <4BF0B08F.1010305@windriver.com>
Date:   Mon, 17 May 2010 10:57:19 +0800
From:   Yang Shi <yang.shi@windriver.com>
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To:     Ralf Baechle <ralf@linux-mips.org>
CC:     linux-mips@linux-mips.org
Subject: Re: [Bug report] Got bus error when loading kernel module on SB1250
 Rev B2 board with 64 bit kernel
References: <4BED25F3.4010809@windriver.com> <20100514180211.GB32203@linux-mips.org>
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Ralf Baechle 写道:
> On Fri, May 14, 2010 at 06:29:07PM +0800, Yang Shi wrote:
>
>   
>> I'm running 2.6.34-rc7 mainline kernel on SB1250 (Rev B2) board. And, I
>> use the default sb1250 kernel config (sb1250-swarm_defconfig). So, 64
>> bit kernel is used. During kernel loading module got bus error, see
>> below log:
>>     
>
> Whops.  Fixes which were supposed to handle exactly this problem went
> upstream for 2.6.34-rc3 and were tested successfully by others on their
> systems.
>
> I wonder if in arch/mips/sibyte/sb1250/setup.c you can instrument
> the function sb1250_m3_workaround_needed() and print the values of
> soc_type, soc_pass and the retun value of that function.  Then let's take
> it from there.
>   

See below log:

Broadcom SiByte BCM1250 B2 @ 800 MHz (SB1 rev 2)

And, soc_typs is 0x0 and soc_pass is 0x11, sb1250_m3_workaround_needed 
should return 1. So, tlb refill handler should go the m3 workaround code 
path.

Thanks,
Yang

>   Ralf
>
>