Re: status grub2 port of grub-legasy map command

[John Stanley <jpsinthemix@verizon.net>]

Hi Javier and all,
I could probably have a version of the drivemap completed this weekend 
as well, but since I've basically simply adapted your drivempa.patch.8 
to r2106, with little change, I'd be more comfortable going with your 
new patch since you know the code much better.

In addition, in the last several days,  have started leaning away from 
it altogether -- because of the use  of an int13 intercept TSR. When I 
started looking at the drivemap patch about a week ago, I assumed it 
simply did some sort of bios (internal) table swapping only. I'm not 
really comfortable with the int13 handler redirect. I worry about 
(possibly rare) problems downstream while running Windows. On the other 
hand, I know it "does work," as I and many others have been using map 
with grub-legasy for several years now. Nevertheless, I'm now a bit 
apprehensive.

For me, for the time-being, as my laptops are all Thinkpads, which have 
bios supplied "boot device table"  functionality (via f12 on poweron), I 
can live without drivemap for those occasions when I need to come down 
from the hilltop to work on Windows.

What I'd like to do with drivemap, is to do boot device swapping by 
changing in the bios which device is to be treated as the "first" boot 
device, which is the second, etc. I know this is doable in principle, 
but it may not be practical, or wise-- I'm not sure.  It would also have 
to be done in a way which does not "pull the rug out on grub" insofar as 
boot device enumeration is concerned.
 

Javier Martín wrote:
> Hello there. I am the original author of the drivemap command. I was
> told by a friend that it was being discussed again on the GRUB list, so
> I came back and examined the two new enabling functionalities, preboot
> hooks and mmap. I've adapted drivemap to use them both, and I'm
> polishing some rough edges. I might send a new version of the patch this
> weekend. Should people, however, prefer John's version, I'd be glad to
> assist.
>
> El mié, 15-04-2009 a las 11:34 +0200, phcoder escribió:
>   
>> Yes it is. Also it's better to use grub_mmap_iterate instead of basing 
>> the location on 0x413 value. How to do it look at mmap/i386/pc/mmap.c
>>     
> The preboot hooks patch works beautifully. However, mmap causes some
> sort of glitch that makes FreeDOS (one of my three drivemap tests,
> together with ReactOS and XP) triple-fault. I've been trying to debug it
> with GDB-over-QEMU, but it is a real PITA. I haven't found any sort of
> bug in the mmap code, so I'm quite dumbfounded right now. Nevertheless,
> I'm proceeding to the XP test, which would likely be the most common use
> case for drivemap.
>
>   
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