Re: HEADS UP! boot2 problems

From: Alexander Kabaev (kan_at_freebsd.org)
Date: 08/05/04

  • Next message: Kent Stewart: "Re: Ports broken by compiler upgrade" 
    Date: Thu, 5 Aug 2004 06:27:28 +0000
To: Scott Long <scottl@samsco.org>

    On Fri, Jul 30, 2004 at 03:21:19PM +0000, Alexander Kabaev wrote:
    > On Thu, Jul 29, 2004 at 08:39:43PM -0600, Scott Long wrote:
    > > All,
    > >
    > > The GCC 3.4 import seems to have broken the boot2 loader on at least
    > > i386. This doesn't affect normal world and kernel builds and installs,
    > > but does affect writing new bootblocks via the disklabel program. You
    > > should refrain from doing this until it gets fixed. It's being looked
    > > into right now.
    > >
    > > Scott
    >
    > Commit below made boot2 usable again.

    As suggested by Matt Dillon, the problems were caused by imcompletely
    zeroed out BSS. I merged approproate fixes from DragonflyBSD in commit
    below. Success/failure reports from people affected are appreciated.

    kann 2004-08-05 06:00:05 UTC

       FreeBSD src repository

       Modified files:
         sys/boot/i386/boot2 boot1.S
         sys/boot/i386/btx/lib btxcsu.s
       Log:
       Move boot2 BSS zeroing into btx startup code out of boot1. boot1 does not
       have clear idea on boot2 BSS size and leaves portion of it not zeroed out.
       btxcsu.s is in much better position for this job.
       
       Obtained from: DragonflyBSD (with minor adjustments)
       
       Revision Changes Path
       1.29 +0 -4 src/sys/boot/i386/boot2/boot1.S
       1.4 +9 -1 src/sys/boot/i386/btx/lib/btxcsu.s

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