Re: installboot is broken

[Matt Thomas <matt%3am-software.com@localhost>]

On Mar 24, 2013, at 9:32 AM, Johnny Billquist <bqt%softjar.se@localhost> wrote:

> On 2013-03-24 16:39, Anders Magnusson wrote:
>> On 03/24/2013 03:36 PM, Martin Husemann wrote:
>>> On Sun, Mar 24, 2013 at 09:21:39AM +0100, Martin Husemann wrote:
>>>> I didn't have old enough disklabel sources around, will check there.
>>> It looks to me that installboot does exactly what disklabel -B did after
>>> this commit:
>>> 
>>> revision 1.17
>>> date: 1995/04/23 19:27:59;  author: ragge;  state: Exp;  lines: +3 -3
>>> Changed to use only one bootblock file on VAX.
>>> 
>>> to sbin/disklabel/Makefile.
>> Vax only have one bootblock which is installed in the first 16 sectors
>> on the disk.
>> The boot block is the same for all different disk types. Which is nice :-)
> 
> Right. However, the real problem is that installboot does not use block 0 
> from xxboot. installboot instead have a structure defined with some "magic" 
> fields, and installboot only changes one or two values in the boot block when 
> you run it. It does copy block 1 and up from xxboot, but it totally skips 
> block 0 of xxboot.

The reason for that is not overwrite the disklabel.