Date: Sun, 19 Sep 2004 23:39:52 +0200
From: Francois Romieu <romieu@fr.zoreil.com>
To: Andy Lutomirski <luto@myrealbox.com>
Cc: Hans-Frieder Vogt <hfvogt@arcor.de>, linux-kernel@vger.kernel.org,
       jgarzik@pobox.com, netdev@oss.sgi.com
Subject: Re: 2.6.9-rc1-bk11+ and 2.6.9-rc1-mm3,4 r8169: freeze during boot (FIX included)
Message-ID: <20040919213952.GA32570@electric-eye.fr.zoreil.com>
References: <200409130035.50823.hfvogt@arcor.de> <20040916070211.GA32592@electric-eye.fr.zoreil.com> <200409161320.16526.jdmason@us.ltcfwd.linux.ibm.com> <200409171043.21772.jdmason@us.ltcfwd.linux.ibm.com> <20040917160151.GA29337@electric-eye.fr.zoreil.com> <414DF773.7060402@myrealbox.com>
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Andy Lutomirski <luto@myrealbox.com> :
[...]
> FWIW, it looks like init_board is setting PCIDAC in tp->cp_cmd but that 
> isn't updated to the card until after the rx ring is filled in 
> r8169_open.  This seems suspicious, since DMA memory is being allocated 
> possibly in >32-bit addresses but the card hasn't been told to support 
> that.  Fixing this doesn't seem to help, though...

rtl8169_hw_start() writes the CPlusCmd register before the ring descriptor
adresses are set. Can you elaborate why it would not be enough ?

Btw the r8169 driver in 2.6.9-rcX does not advertise NETIF_F_HIGHDMA: where
would a >32 bit address come from ?

> Turning off high DMA fixes it.  Maybe it just needs to be disabled until 
> someone figures out what's going on.

I am cooking a patch for it (+ check for PCI error).

As a side note, the r8169 chipset does not like DAC to be enabled on a
32bit system. I got the usual PCI error reported while trying it.

--
Ueimor
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