Re: Chain-booting PXE bootloaders

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 08/27/2010 01:51 AM, Turner, Ian wrote:
> Here are a couple of use cases:
>
> Windows:
> http://technet.microsoft.com/en-us/library/cc722358%28WS.10%29.aspx
>
>   
Hm, this case is the only when it's necessary.
> Solaris:
> http://redhatcat.blogspot.com/2008/07/loading-pxegrub-from-pxelinux.html
>
>   
Solaris is loaded with multiboot
> Other random proprietary software:
> http://syslinux.zytor.com/archives/2006-April/006811.html
>   
This example doesn't need chainloading. Just:
linux16 (pxe)/memdisk
initrd16 (pxe)/floppy.img

Same as with normal chainloader windows usecase is enough. And same as
with normal chainloader it'll be misused for not-sane things. But as I
figured out, we can't do anything more than recommend sane configs. If
users do things improper way it's their right to.
> It seems like what this requires is to leave the UNDI & PXE drivers loaded, then load the chain image and jump to it.
>
> If this isn't supported as-is, no worries, just wanted to check if it was expected to work. Let me know if you need more information on Windows. I am not a Windows guy myself so can only go so deep.
>
> Cheers,
>
> --Ian
>
> -----Original Message-----
> From: grub-devel-bounces+ian.turner=deshaw.com@gnu.org [mailto:grub-devel-bounces+ian.turner=deshaw.com@gnu.org] On Behalf Of Vladimir 'f-coder/phcoder' Serbinenko
> Sent: Thursday, August 26, 2010 7:22 PM
> To: grub-devel@gnu.org
> Subject: Re: Chain-booting PXE bootloaders
>
> On 08/27/2010 01:04 AM, Turner, Ian wrote:
>   
>> Hello all,
>>
>> We're trying to chainload PXE bootloaders. This is required in order to netboot Windows or DOS, and is also useful for Solaris jumpstart builds.
>>     
> It's not supported because of a priori no clear benefits present.
> @Seth can you comment on Solaris part?
> DOS is best loaded using grub+memdisk (later one is a helper available
> from syslinux pages).
> Could you detail the windows part?
>   
>>  Is this feature supported by GRUB? Simply running the following command line causes GRUB to read the configuration file the TFTP server, then either hang or reboot:
>>
>> chainloader --force /path/to/pxelinux.0
>>   
>>     
> Usually if someone tells you "wrong signature" it may mean something...
> --force was added because of now dead SCO (now Tarantella, don't confuse
> with Litigious Bastards) Unix. Removing it may create some hassle if
> someone uses it so it's kept.
>   
>> boot
>>
>> Thanks in advance for your thoughts.
>>
>> --Ian Turner
>>
>> _______________________________________________
>> Grub-devel mailing list
>> Grub-devel@gnu.org
>> http://lists.gnu.org/mailman/listinfo/grub-devel
>>
>>   
>>     
>
>   
>
>
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>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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