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Date: Tue, 19 Sep 2006 18:16:06 -0700
From: "Manoj Sharma" <manoj.shar@gmail.com>
To: linuxppc-dev@ozlabs.org
Subject: Re: Hang with isync
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>
> Hi,
>
> We use linux kernel 2.4.20 on ppc405 and the system hangs once in a while
> when isync gets called in this function:
>
> _GLOBAL(_nmask_and_or_msr)
>     mfmsr   r0      /* Get current msr */
>     andc    r0,r0,r3    /* And off the bits set in r3 (first parm) */
>     or  r0,r0,r4    /* Or on the bits in r4 (second parm) */
>     sync            /* Some chip revs have problems here... */
>     isync
>     mtmsr   r0      /* Update machine state */
>     isync
>     blr         /* Done */
>
>  2.5 onwards, I find that "sync; isync" has been replaced by a macro SYNC
> (defined only for 601). I don't find it in any changelog and reason for the
> change.
>
> Can someone give some information on this change?
>
> Appreciate any help.
> Manoj
>
> <linuxppc-dev@ozlabs.org>
>

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<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>Hi,<br><br>We use linux kernel 2.4.20 on ppc405 and the system hangs once in a while when isync gets called in this function:
<br><br>_GLOBAL(_nmask_and_or_msr)<br>&nbsp;&nbsp;&nbsp; mfmsr&nbsp;&nbsp; r0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* Get current msr */<br>&nbsp;&nbsp;&nbsp; andc&nbsp;&nbsp;&nbsp; r0,r0,r3&nbsp;&nbsp;&nbsp; /* And off the bits set in r3 (first parm) */
<br>&nbsp;&nbsp;&nbsp; or&nbsp; r0,r0,r4&nbsp;&nbsp;&nbsp; /* Or on the bits in r4 (second parm) */<br>&nbsp;&nbsp;&nbsp; sync&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* Some chip revs have problems here... */<br>&nbsp;&nbsp;&nbsp; isync<br>&nbsp;&nbsp;&nbsp; mtmsr&nbsp;&nbsp; r0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* Update machine state */<br>&nbsp;&nbsp;&nbsp; isync<br>&nbsp;&nbsp;&nbsp; blr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* Done */
<br><br>&nbsp;2.5 onwards, I find that &quot;sync; isync&quot; has been replaced by a macro SYNC (defined only for 601). I don't find it in any changelog and reason for the change.<br><br>Can someone give some information on this change? 
<br><br>Appreciate any help.<br></div><div><span class="sg">Manoj<br><br><a href="mailto:linuxppc-dev@ozlabs.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"></a>

</span></div></blockquote></div><br>

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