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Date:	Wed, 12 Feb 2014 09:15:03 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Madper Xie <cxie@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [BUG] can't boot up: unable to handle kernel paging request at
 ffffffffff340003

On Tue, 2014-02-11 at 14:18 +0000, Matt Fleming wrote:
> (Entering the realm of ACPI, pulling in more folks)
> 
> On Tue, 11 Feb, at 09:47:57PM, Madper Xie wrote:
> > Thanks for your reply. I attached the all the dmesg outputs for you.
> > [    0.000000] ACPI: BGRT 00000000d9bb5100 00003C (v00 HPQOEM SLIC-BPC 01072009 AMI  00010013)
>  
> Your BGRT table has an extra 4 bytes for some reason, (0x3C should be
> 0x38) and doesn't match the defintion in include/acpi/actbl3.h,
> 
> 
> struct acpi_table_bgrt {
> 	struct acpi_table_header header;	/* Common ACPI table header */
> 	u16 version;
> 	u8 status;
> 	u8 image_type;
> 	u64 image_address;
> 	u32 image_offset_x;
> 	u32 image_offset_y;
> };
> 
> 
> which explains why when we dereference ->image_address we don't get a
> sensible value.
> 
> Guys, what do you make of this? Firmware bug? Full thread here,
> 
>   http://article.gmane.org/gmane.linux.kernel.efi/3499
> 

Hi Matt,

Yes, I agree that the table size should be 0x38.  However, ACPI spec
states that bit0 of status indicates if the boot image graphic is valid.
This bit is set to 0 (invalid) on the system.  Can you check this bit
and return when invalid? 

Thanks,
-Toshi

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