[syslinux] Is it possible to chainload EXTLINUX from GRUB?

[Gavin D. Smith]

H. Peter Anvin wrote:

>Gavin D. Smith wrote:
>> I have just tried placing EXTLINUX on a primary partition and indeed I 
>> successfully chainloaded it. However this doesn't seem to work when I 
>> put it on a logical partition. Is there a reason why there might be a 
>> difference between the two types?
>
>Not if the chainloading code is written properly.  Chainloading onto a 
>logical partition means you have to load not the MBR but the pseudo-MBR 
>containing the logical partition in question at address 0x600 and point 
>DS:SI to it.
>
>Sounds like a Grub problem to me.
>
>	-hpa
>
To see if Grub has a problem chainloading onto a logical partition I tried 
installing GRUB onto the logical partition, and it was successfully loaded. 
I also tried LILO on the logical partition, and it also was successfully 
loaded. However trying extlinux I got the same "Boot error" message as 
before. This may be because of a slight difference in my installing methods 
that I have overlooked, but I don't know what that might be. I know that 
the syslinux loader is loaded because "Boot error" is a message in that 
loader. So you say this message is due to some registers not being set 
correctly? Would there be a way of seeing what the registers contain so I 
can tell if they're right or not? I don't have many more ideas of things to 
try.

Gavin Smith