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

James A. Peltier jpeltier at sfu.ca
Sun Jan 29 18:28:33 UTC 2017

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 [ http://tools.ietf.org/html/rfc4578 | RFC
| 4578 ] , see the NOTES here: [ http://www.ipxe.org/cfg/platform |
| 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.

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James A. Peltier 
IT Services - Research Computing Group 
Simon Fraser University - Burnaby Campus 
Phone : 604-365-6432 
Fax : 778-782-3045 
E-Mail : jpeltier at sfu.ca 
Website : http://www.sfu.ca/itservices 
Twitter : @sfu_rcg 
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