linux-kernel - Re: [Linux-fbdev-devel] fbmem: is bootup logo broken for monochrome LCD ?

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Date:	Mon, 20 Nov 2006 16:42:58 +0000 (GMT)
From:	James Simmons <jsimmons@...radead.org>
To:	Franck Bui-Huu <vagabon.xyz@...il.com>
cc:	Linux Fbdev development list 
	<linux-fbdev-devel@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [Linux-fbdev-devel] fbmem: is bootup logo broken for monochrome
 LCD ?


> On 11/17/06, James Simmons <jsimmons@...radead.org> wrote:
> > 
> > Are those actually numbers? If they are the problem isn't byte reversal
> > but bit shifting.
> > 
> > 1010100 = 54
> > 0101010 = 2A
> 
> It's not byte reversal, but _bits_ of each bytes have been inversed
> (bit7->bit0, bit6->bit1, bit5->bit2, bit4->bit3, bit3->bit4, ...)
> after calling slow_imageblit(). Is it something expected ?

Yipes!! Bit reversal. I have never seen that before. Is only the logo
messed up? Slow_imageblit can be called if there is no dword alignment 
for the font bitmaps. So the question is do most if not all our fonts 
look okay?
 
> > I really don't understand why fbmem.c has its own routines to handle the
> > logo for the color > map. I can set creating a fbcmap and calling
> > fb_set_cmap instead.
> 
> Unfortunately I cannot help you on this point...
> 
> > That will be a  separte patch.
> > 
> 
> Thanks
> 
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