Messages in this thread | | | Date | Tue, 08 May 2007 19:23:03 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage |
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Eric W. Biederman wrote: > > I expect I can find a few more examples where we specify > video_cols and video_lines but we use video_mode == 0. > > Going farther mode 0x00 is a BIOS 40x25 mode. So the patch below is > not always safe even if we boot the bzImage. It is just highly > unlikely anyone would start the kernel in 40x25 text mode. >
Mode 0x00 is, at least theoretically, BIOS 40x25 *grayscale*; this mode (and mode 0x02 which is the same thing in 80x25) were as far as I know only ever used with composite monitors off CGA cards, i.e. functionally never. Actual monochrome monitors used mode 0x07.
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