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From: Chuck Ebbert <>
To: Linus Torvalds <>
Cc: Edgar Hucek <>,
	linux-kernel <>
Subject: Re: [PATCH 1/1] Fix boot on efi 32 bit Machines [try #4]
Date: Fri, 14 Jul 2006 09:57:55 -0400
Message-ID: <> (raw)

In-Reply-To: <>

On Thu, 13 Jul 2006 15:15:21 -0700, Linus Torvalds wrote:

> > From kernel 2.6.16 to kernel 2.6.17 a new check is made.
> > File arch/i386/pci/mmconfig.c -> funktion pci_mmcfg_init -> check e820_all_mapped
> > The courios thing is that this check will always fail on the
> > Intel Macs booted through efi. Parsing of the ACPI_MCFG table
> > returns e0000000 for the start. But this location is
> > not in the memory map which the efi firmware have :
> > BIOS-EFI: 00000000e00f8000 - 00000000e00f9000 (reserved)
> It _sounds_ like you may not have converted all the EFI types 
> (EFI_UNUSABLE_MEMORY?), but regardless, I think it would be fine to have 
> perhaps a "PCI_FORCE_MMCONF" flag that avoided that sanity check, and then 
> you could have some code (either the EFI code _or_ some DMI code) that 
> sets it for the Intel Macs.
> Note that the check in pci_mmcfg_init() shouldn't be some EFI hack itself, 
> it would be a real flag for the PCI subsystem, independently of EFI (I can 
> see it being useful for a kernel command line option, even), and the only 
> EFI connection would be that perhaps the EFI code ends up setting that 
> flag (especially if there is some EFI command for doing this).
> Btw, if you do do this, I think we should make sure that the MMCONFIG base 
> address is reserved in the PCI MMIO resource structures (which we don't do 
> now, I think - part of the whole point of verifying that it's marked as 
> E820_RESERVED is exactly the fact that otherwise we migth have problems 
> with PCI MMIO resource allocations allocating a regular PCI resource over 
> the MMCONFIG space..)

I just reposted Rajesh's patch for this (fixed the one previous complaint
from the list.)

 Subj:  [patch, take 3] PCI: use ACPI to verify extended config space on x86

Edgar, can you get it and test?

Discussion should probably continue in that thread...

 "You can't read a newspaper if you can't read."  --George W. Bush

             reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-14 13:57 Chuck Ebbert [this message]
2006-07-14 14:45 ` Edgar Hucek
2006-07-14 19:28 ` Edgar Hucek
  -- strict thread matches above, loose matches on Subject: below --
2006-07-16 12:09 Thomas Meyer
2006-06-26 22:22 Thomas Meyer
2006-06-26 21:19 Edgar Hucek
2006-06-26 21:33 ` Linus Torvalds
2006-06-27  6:15   ` Edgar Hucek
2006-06-27  6:20     ` Linus Torvalds
2006-06-28 22:37       ` H. Peter Anvin
2006-07-02 17:39         ` Eric W. Biederman
2006-07-02 17:42           ` H. Peter Anvin
2006-07-02 18:26             ` Eric W. Biederman
2006-07-02 18:46               ` Arjan van de Ven
2006-07-05  9:38               ` Edgar Hucek
2006-07-05 15:52                 ` Eric W. Biederman
2006-07-13 21:46                   ` Edgar Hucek
2006-07-13 22:15                     ` Linus Torvalds
2006-07-14  4:23                       ` Eric W. Biederman
2006-07-14  6:22                         ` H. Peter Anvin
2006-07-14  6:20                       ` Edgar Hucek
2006-07-14 16:09                         ` Linus Torvalds

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