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| Subject:
Raw hardware VGA driver Q
From: Julian Smart ####@####.#### Date: 7 Jan 2002 15:34:33 -0000 Message-Id: <4.2.0.58.20020107153139.0218bdc0@pop> Hi, Has anyone adapted the VGA driver to do more than 4-bit colour on a x86 hardware? I'm interested to know how hard this would be to get going under eCos. Or maybe > 4-bit colour diverges from known standards sufficiently to depend on particular video chips. (I don't have a particular video card in mind right now.) Thanks, Julian -- Red Hat UK Ltd, Unit 200 Rustat House, 62 Clifton Road, Cambridge, UK. CB1 7EG Tel: +44 (1223) 271063 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Subject:
Re: [nanogui] Raw hardware VGA driver Q
From: Alan Cox ####@####.#### Date: 7 Jan 2002 15:58:03 -0000 Message-Id: <E16NcIo-0001e7-00@the-village.bc.nu> > Has anyone adapted the VGA driver to do more than 4-bit colour on a x86 hardware? I'm interested > to know how hard this would be to get going under eCos. Or maybe > 4-bit colour diverges from known > standards sufficiently to depend on particular video chips. (I don't have a particular video > card in mind right now.) VGA 4bit is somewhat demented. A conventional 4bpp frame buffer (ie nibble packed and direct access) should be a lot easier in fact | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Subject:
Re: [nanogui] Raw hardware VGA driver Q
From: Julian Smart ####@####.#### Date: 7 Jan 2002 17:13:44 -0000 Message-Id: <4.2.0.58.20020107165629.062a0ec0@pop> At 04:07 PM 1/7/02 +0000, Alan Cox wrote: >> Has anyone adapted the VGA driver to do more than 4-bit colour on a x86 >hardware? I'm interested >> to know how hard this would be to get going under eCos. Or maybe > 4-bit >colour diverges from known >> standards sufficiently to depend on particular video chips. (I don't have >a particular video >> card in mind right now.) > >VGA 4bit is somewhat demented. A conventional 4bpp frame buffer (ie nibble >packed and direct access) should be a lot easier in fact Right, thanks. Does anyone know of a generic way to address SVGA displays above 640x480x4 (on eCos, not Linux) without having to write a new driver for each video chipset? Or maybe somone has a sample SVGA driver they might be willing to share. Regards, Julian -- Red Hat UK Ltd, Unit 200 Rustat House, 62 Clifton Road, Cambridge, UK. CB1 7EG Tel: +44 (1223) 271063 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Subject:
Re: [nanogui] Raw hardware VGA driver Q
From: Alan Cox ####@####.#### Date: 7 Jan 2002 17:24:24 -0000 Message-Id: <E16NdeQ-0001su-00@the-village.bc.nu> > Right, thanks. Does anyone know of a generic way to address SVGA displays above 640x480x4 > (on eCos, not Linux) without having to write a new driver for each video chipset? Or maybe > somone has a sample SVGA driver they might be willing to share. There is no generic way to do so, nor is there a generic way to initialise the chipset (which is generally an even bigger issue). Pretty much all SVGA chipsets can be initialised into a mode where they provide byte packed 8/16/32bit (paletteised, RGB555/RGB565/RGBA) frame buffers linearly in memory with exactly the sane layout you would expect (and the existing drivers expect for Linux framebuffer modes) Alan | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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