linux-kernel - Re: [BUG] can't boot up: unable to handle kernel paging request at ffffffffff340003

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Message-ID: <87k3czdtbf.fsf@redhat.com>
Date:	Thu, 13 Feb 2014 21:40:36 +0800
From:	Madper Xie <cxie@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Toshi Kani <toshi.kani@...com>, Madper Xie <cxie@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi\@vger.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


matt@...sole-pimps.org writes:

> On Wed, 12 Feb, at 09:15:03AM, Toshi Kani wrote:
>> 
>> 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? 
>
> Madper, could you try out this patch?
>
Thanks Matt. This patch fix the panic. And ioremap warning disappeared
after apply your patch.
> ---
>
> diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
> index 4df9591eadad..f15103dff4b4 100644
> --- a/arch/x86/platform/efi/efi-bgrt.c
> +++ b/arch/x86/platform/efi/efi-bgrt.c
> @@ -42,7 +42,7 @@ void __init efi_bgrt_init(void)
>  
>  	if (bgrt_tab->header.length < sizeof(*bgrt_tab))
>  		return;
> -	if (bgrt_tab->version != 1)
> +	if (bgrt_tab->version != 1 || bgrt_tab->status != 1)
>  		return;
>  	if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)
>  		return;

-- 
Madper
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