Re: boot option for CONFIG_EDD_SKIP_MBR?

[Carl-Daniel Hailfinger <c-d.hailfinger.kernel.2004@gmx.net>]

Dave Jones schrieb:
> On Thu, Nov 04, 2004 at 07:45:34AM -0600, Matt Domsch wrote:
>  > On Thu, Nov 04, 2004 at 02:35:58PM +0100, Carl-Daniel Hailfinger wrote:
>  > > [please CC: me on replies]
>  > > having had problems (inifinte hang on boot) with some Fujitsu
>  > > Siemens Scenic computers when EDD was enabled, I asked myself
>  > > if it would be possible to add a boot option edd=nombr and
>  > > possibly also another boot option edd=off to the EDD code in
>  > > the kernel. These would correspond to CONFIG_EDD_SKIP_MBR
>  > > and CONFIG_EDD, respectively.
>  > >
>  > > Yes, option parsing before entering protected mode is ugly,
>  > > but the vga setup code does it, too.
>  > > 
>  > > What do you think?
>  > 
>  > I'd love it.  I hadn't done it as I thought it would be ugly, and so
>  > far I could blame buggy BIOSes for the delay.  If you want to work up
>  > a patch, I'll gladly review and apply something that does such.
> 
> But would this actually be useful for the cases where EDD has been
> broken so far ? AFAIR, the bootparam parsing happens /after/
> we do the 16-bit EDD asm foo.

AFAIR the VGA setup code does its bootparam parsing by hand because it
suffers from the same problem.

Regards,
Carl-Daniel
-- 
http://www.hailfinger.org/