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From: Eric Nelson <eric.nelson@boundarydevices.com>
To: "PAPARO Nino (MM)" <nino.paparo@magnetimarelli.com>
Cc: "meta-freescale@yoctoproject.org" <meta-freescale@yoctoproject.org>
Subject: Re: resolution not changing
Date: Thu, 16 May 2013 06:39:49 -0700	[thread overview]
Message-ID: <5194E1A5.8060708@boundarydevices.com> (raw)
In-Reply-To: <BD0864EDB115BF49BB58EF14BF245DAA3FA8DD1E28@MXCL14.fgremc.it>

Hi Nino,

On 05/16/2013 05:58 AM, PAPARO Nino (MM) wrote:
> Hi,
> I'm having a similar issue with a 800x480 rgb screen, I'd like to change the colordepth to 24.
> The uboot setting I'm using is:
>
> setenv bootargs $bootargs video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB666
>
> and I tried setting it to:
>
> setenv bootargs $bootargs video=mxcfb0:dev=lcd,800x480,if=RGB24
>

I think you want 800x480M@60 here instead of 800x480.

> but this does'nt seem to work.
> Any help would be appreciated.
>
> Nino
>

The "if=RGBx" parameter controls the output pixel format to match the
display. It doesn't change the frame-buffer memory layout.

For that, you want to use the 'bpp=N' flag.

setenv bootargs $bootargs video=mxcfb0:dev=lcd,CLAA-WVGA,bpp=24,if=RGB666

You can verify this after boot by looking in /sys:
	# cat /sys/class/graphics/fb0/bits_per_pixel

Regards,


Eric


  parent reply	other threads:[~2013-05-16 13:39 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-15 22:05 resolution not changing Alexander Keller
2013-05-15 22:49 ` He Zheng
2013-05-15 23:12 ` Alexander Keller
2013-05-16  7:12   ` Erik Botö
2013-05-16  7:14   ` Eric Bénard
2013-05-16 12:58     ` PAPARO Nino (MM)
2013-05-16 13:29       ` Eric Bénard
2013-05-16 13:39       ` Eric Nelson [this message]
2013-05-20 14:32         ` PAPARO Nino (MM)
2013-05-20 16:24           ` Eric Nelson
2013-05-20 17:44           ` Eric Bénard

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