Messages in this thread Patch in this message | | | Date | Sat, 19 Oct 2002 14:18:06 -0300 | From | Werner Almesberger <> | Subject | Re: [CFT] kexec syscall for 2.5.43 (linux booting linux) |
| |
Eric W. Biederman wrote: > Cool. What fails with X11. Fixing it might be as simple as calling > int 0x10 early in the new image.
The graphic engine (i810) simply doesn't switch back to text mode. Yes, 0x10 helps. I've attached a little patch that does this in a relatively safe way. (Alternative, one could also use set_80x25, but I think always forcing mode 3 is slightly more reliable. Except for MGA users, of course :-)
If you get a new boot loader type code from Peter Anvin, this should even be good enough for inclusion into the mainstream kernel. Alternatively, we could also pick a new loader flag to indicate that the firmware didn't initialize the system.
> [vmlinux] specifies incorrect physical > addresses, and it expects to be passed a whole host of strange values, > in weird places.
I see. Perhaps you could say then that mkelfImage fixes flaws in the vmlinux ELF image meta-data, or such:
| A kernel reformater is makes images that seem to boot more reliably is at: | ftp://ftp.lnxi.com/pub/mkelfImage/mkelfImage-1.17.tar.gz
This sounds more like "if I kick it here, it usually works, but I have no idea why" :-)
And yes, if it's not too intrusive, fixing the ELF meta-data along with the addition of kexec might be a good idea.
- Werner
---------------------------------- cut here -----------------------------------
--- linux-2.5.44/arch/i386/boot/video.S.orig Sat Oct 19 12:55:14 2002 +++ linux-2.5.44/arch/i386/boot/video.S Sat Oct 19 13:51:19 2002 @@ -148,6 +148,13 @@ cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card. je basret + cmpb $0xff,type_of_loader # are we using kexec ? + jne novgareset + + movw $0x3, %ax # reset EGA/VGA to 80x25 text + int $0x10 + +novgareset: incb adapter movw $0x1a00, %ax # Check EGA or VGA? int $0x10 -- _________________________________________________________________________ / Werner Almesberger, Buenos Aires, Argentina wa@almesberger.net / /_http://www.almesberger.net/____________________________________________/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |