From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Jones <pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] x86/efi: Add EFI framebuffer earlyprintk support
Date: Thu, 10 Oct 2013 13:37:10 -0400
Message-ID: <20131010173710.GA18821@fenchurch.internal.datastacks.com>
References: <1381423261-30566-1-git-send-email-matt@console-pimps.org>
 <20131010172844.GA26430@gmail.com>
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To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Matt Fleming <matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
List-Id: linux-efi@vger.kernel.org

On Thu, Oct 10, 2013 at 07:28:44PM +0200, Ingo Molnar wrote:
> 
> Is a non-32-bit framebuffer a possibility? If yes then it might be nice to 
> emit an informative printk() here, so that users who try to enable EFI 
> early-printk can at least see why it's not working. (Assuming they get to 
> look at regular printk output, on a safe/working kernel.)

Not really - the spec allows RGBx, BGRx, and for custom bit masks, but
they're define like:

typedef struct {
	UINT32 RedMask;
	UINT32 GreenMask;
	UINT32 BlueMask;
	UINT32 ReservedMask;
} EFI_PIXEL_BITMASK;

-- 
        Peter