From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <James.Bottomley@suse.de>
Subject: Re: LSI MegaRAID not recognised correctly in 64-bit.  2.6.29.6
Date: Thu, 17 Sep 2009 09:59:07 -0600
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On Wed, 2009-09-16 at 19:59 -0700, Eddie wrote:
> >
> >> How much memory does your system have?
> >>
> >> Best guess in the 64 bit case is that the physical memory the kernel is
> >> doing DMA to isn't within the range of the card.  You might be able to
> >> test this by booting with the max_addr=4G parameter in the 64 bit case.
> >>
> >> If it is, we'll have to get the DMA mask for this thing set up
> >> correctly.
> >>
> >> James
> >>   
> >
> > James,
> >
> > It's got 8Gig.
> >
> > I'll try your suggestion tonight, when I get home.
> >
> > Cheers,
> > Eddie
> >
> OK, adding addappend = " max_addr=4G" to my lilo.conf made no 
> difference.  It still booted with all 8G.  :(
> 
> But, changing it to addappend = " mem=4G" seemed to do the trick.
> 
> And, your guess might be correct.  I now see the correct messages for 
> the MegaRAID:
> 
> scsi 4:4:0:0: Direct-Access     MegaRAID LD 0 RAID5 1430G N661 PQ: 0 ANSI: 2
> sd 4:4:0:0: [sda] 2930307072 512-byte hardware sectors: (1.50 TB/1.36 TiB)
> sd 4:4:0:0: [sda] Write Protect is off
> sd 4:4:0:0: [sda] Mode Sense: 00 00 00 00
> sd 4:4:0:0: [sda] Asking for cache data failed
> sd 4:4:0:0: [sda] Assuming drive cache: write through
> sd 4:4:0:0: [sda] 2930307072 512-byte hardware sectors: (1.50 TB/1.36 TiB)
> sd 4:4:0:0: [sda] Write Protect is off
> sd 4:4:0:0: [sda] Mode Sense: 00 00 00 00
> sd 4:4:0:0: [sda] Asking for cache data failed
> sd 4:4:0:0: [sda] Assuming drive cache: write through
>  sda: sda1
> sd 4:4:0:0: [sda] Attached SCSI disk
> sd 4:4:0:0: Attached scsi generic sg1 type 0

Hmm, so the driver looks to do this correctly.  By default it sets a 32
bit DMA mask but it raises it to 64 bits for certain boards which can
support that (based on the PCI ids).  Can you do an lspci -n -v and send
the output?  That will tell me whether the board got a 64 bit mask.

Thanks,

James