Messages in this thread | | | Date | Fri, 10 Nov 2006 11:44:19 +0100 | Subject | Re: 2.6.19-rc5-mm1: HPC nx6325 breakage, VESA fb problem, md-raid problem | From | Franck Bui-Huu <> |
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Andrew Morton wrote: > On Thu, 9 Nov 2006 16:42:00 +0100 > "Rafael J. Wysocki" <rjw@sisk.pl> wrote: > >> This indeed is caused by fbcon-rere-fix-little-endian-bogosity-in-slow_imageblit.patch >> which affects two out of three boxes on which I tested it (both have Radeon cards). > > Thanks, dropped. >
Well I'm probably missing something but I really don't see what !
For example, let say that the four first bytes of an image are 0x06, 0xe0, 0x38, 0x00.
If bpp = 1 start_index = 0 on a little endian platform this patch is _not_ applied
slow_imageblit() will write into the frame buffer the following bytes: 0x60, 0x07, 0x1c, 0x00 instead of the original ones. The bits of each bytes have been inversed (bit7->bit0, bit6->bit1, bit5->bit2, bit4->bit3, bit3->bit4, ...) and that's the reason why _I_ get all fonts inverted.
With this patch applied, the bytes written into the frame buffer will be exactly the same as the original ones. Therefore it fixes my inverted view but broke Rafael's one.
Now, I'm very not familiar with all frame buffer stuff so I must be missing somthing obvious. If anyone could give me some hints there that would be nice.
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