From: "H. Peter Anvin" <hpa@zytor.com>
To: Frank Sorenson <frank@tuxrocks.com>
Cc: pascal.bellard@ads-lu.com, Riley@Williams.Name,
Linux-Kernel@vger.kernel.org
Subject: Re: [i386 BOOT CODE] kernel bootable again
Date: Tue, 13 Sep 2005 12:42:21 -0700 [thread overview]
Message-ID: <43272B9D.1030301@zytor.com> (raw)
In-Reply-To: <432722A1.8030302@tuxrocks.com>
Frank Sorenson wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Pascal Bellard wrote:
>
>>Hello,
>>
>>Please find attached a patch to build i386/x86_64 kernel directly
>>bootable. It may be usefull for rescue floppies and installation
>>floppies.
>
>
> Pascal,
>
> In commit f8eeaaf4180334a8e5c3582fe62a5f8176a8c124, build.c has already
> changed, and I don't believe it's very compatible with this change.
>
> See
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f8eeaaf4180334a8e5c3582fe62a5f8176a8c124
>
> Also, we'll need to see comments from H. Peter Anvin on this patch.
> CC'ing him.
>
Geometry detection by looking for error returns is fundamentally broken.
Way too many non-traditional floppies (USB, IDE...) do not handle this
at all, they will return successfully, with the data being the data from
a sector from another track, and thus you end up with aliasing and a
corrupt boot. You can do it with fingerprinting, but that's complex and
error-prone.
In short, this made sense in 1991, but it hasn't made sense for a very
long time now. Resurrecting bootsect.S is *NOT* a good idea.
-hpa
next prev parent reply other threads:[~2005-09-13 19:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-13 13:46 [i386 BOOT CODE] kernel bootable again Pascal Bellard
2005-09-13 19:04 ` Frank Sorenson
2005-09-13 19:42 ` H. Peter Anvin [this message]
2005-09-14 9:42 ` Pascal Bellard
2005-09-14 9:55 ` Martin Mares
2005-09-14 16:38 ` H. Peter Anvin
2005-09-17 15:26 ` Giuseppe Bilotta
2005-09-17 15:56 ` Jesper Juhl
2005-09-17 16:19 ` Giuseppe Bilotta
2005-09-19 2:13 ` Coywolf Qi Hunt
2005-09-14 9:52 ` Pascal Bellard
-- strict thread matches above, loose matches on Subject: below --
2005-09-20 17:13 Etienne Lorrain
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=43272B9D.1030301@zytor.com \
--to=hpa@zytor.com \
--cc=Linux-Kernel@vger.kernel.org \
--cc=Riley@Williams.Name \
--cc=frank@tuxrocks.com \
--cc=pascal.bellard@ads-lu.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.