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From: Alan Cox <alan@linux.intel.com>
To: jiang.biao2@zte.com.cn, dri-devel@lists.freedesktop.org,
	Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: Dave Airlie <airlied@redhat.com>
Subject: Re: [RFC] drm/gma500: add virtual mapping support for fbdev.
Date: Tue, 06 Sep 2016 22:16:49 +0100	[thread overview]
Message-ID: <1473196609.5944.38.camel@linux.intel.com> (raw)
In-Reply-To: <OF5FC7E87B.77D8F064-ON48258026.003C7F7D-48258026.003EF6A5@zte.com.cn>

On Tue, 2016-09-06 at 19:28 +0800, jiang.biao2@zte.com.cn wrote:
> Hi, 
> 
> I found current gma500 fbdev driver does not support the virtual 
> mapping for the fb pages, instead it only uses stolen pages and 
> supports high resolution console by reducing the color depth. It 
> works well with fbcon for high resolution envirnment. 

The text mode console code can't support a non-linear mapping and
trying to grab one used most or all of the vmalloc address space on a
32bit box (and most of those systems are only able to run 32bit).

For the sake of a bootscreen loader (which could use DRM directly
instead if it needed high resolution) it didn't seem worht it.

Either way it's not IMHO a good idea for 32bit, 64bit maybe.

Alan

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  reply	other threads:[~2016-09-06 21:17 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-06 11:28 [RFC] drm/gma500: add virtual mapping support for fbdev jiang.biao2
2016-09-06 21:16 ` Alan Cox [this message]
2016-09-07  0:48   ` jiang.biao2

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