[ipxe-devel] Addendum [was Re: Dual BIOS and EFI boot ISO]

[Dean Westhead]

Hi James, 

Yes that is exactly what I am trying to do. 

I must admit that I have no idea how Centos (or the other distributions), do this. 

Dean. 

Sent from Nine
________________________________
From: "James A. Peltier" <jpeltier at sfu.ca>
Sent: 29 Jan 2017 18:28
To: Dean Westhead
Cc: Oliver Rath; ipxe-devel
Subject: Re: [ipxe-devel] Addendum [was Re: Dual BIOS and EFI boot ISO]

You are trying to create an ISO image that supports both BIOS and UEFI boot modes, similar to how a CentOS 7 ISO image is able to boot both.  This is not possible given how iPXE currently creates it's ISO images.  As far as I am aware, the ISOs to not contain relocatable code that can allow for a unified entry point for both platforms.  Perhaps I am wrong in this, but I don't see any way to do it currently.

----- On 29 Jan, 2017, at 01:18, Dean Westhead <dean at westhead.net> wrote:
>
> Hi Oliver,
>
> Thanks for that info.
>
>  have already done that part and the BIOS ISO and the EFI ISO works fine and boots and detects what system it is on etc.
>
> The problem I have is the part that in that forum that states :
>
> "But as far as the iPXE Binary goes, you need to go up one level to the DHCP server"
>
> The problem I have is that in our server environment, we dont use DHCP ... everything has a static IP.
>
> That is not a problem with iPXE .... I have an embeded script that when the ISO is booted it opens a console and asks the user for the IP, subnet mask, gateway and DNS server. It then uses this
> info to open the NIC, connect to the network and chain the menus etc from our central build server.
>
> This all works fine if I boot either the BIOS ISO or the EFI ISO and the servers build fine depending on which environment they are booted into.
>
> What I am now trying to do is not have two different ISO's .... one for BIOS and one for EFI.
>
> I would like to boot one ISO and that ISO will detect and run either the BIOS boot sequence or the EFI sequence. I basically need an ISO that will boot and do the function of the DHCP server by loading the correct iPXE binary for either 
> BIOS or EFI.
>
> This may not be possible but so far I have not found anything that iPXE couldnt do !
>
> Thanks.
>
> Dean.
>
>
>
> ________________________________
> From: "Oliver Rath" <oliver at greenunit.de>
> To: "ipxe-devel" <ipxe-devel at lists.ipxe.org>
> Sent: Sunday, 29 January, 2017 07:12:51
> Subject: [ipxe-devel] Addendum [was Re:  Dual BIOS and EFI boot ISO]
>
> Hi Dean,
>
> you can also use the DHCP Client Architecture option (code 93) will indicate the client architecture as specified by RFC 4578, see the NOTES here: http://www.ipxe.org/cfg/platform
>
> Hth,
>
> Oliver
>
>
> On 28.01.2017 20:32, Dean Westhead wrote:
>>
>> Hi,
>>
>> I am able to create an iPXE BIOS bootable iso and a iPXE EFI bootable ISO ... is there a way to create one ISO that will boot on both environments and detect which one needs booting ?
>>
>> I know that the major linux distributions do this with their build media but is this possible with the iPXE ?
>>
>> Thanks.
>>
>> Dean.
>>
>>
>>
>> _______________________________________________
>>
>> ipxe-devel mailing list
>>
>> ipxe-devel at lists.ipxe.org
>>
>> https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
>>
>
>
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>
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-- 
James A. Peltier
IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
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