Syslinux - Jul 2014 - isohybrid binary not in 6.03-pre18? (utils bt is in bios/utils?)

On 9 Jul 2014 at 6:01, Gene Cumm wrote:

Date sent:	Wed, 9 Jul 2014 06:01:22 -0400
Subject:	Re: [syslinux] isohybrid binary not in 6.03-pre18? (utils bt is in
bios/utils?)
From:	Gene Cumm <gene.cumm at gmail.com>
To:	"Michael D. Setzer, II" <mikes at kuentos.guam.net>
Copies to:	Syslinux at zytor.com
> 
> On Jul 9, 2014 5:15 AM, "Michael D. Setzer II"
> <mikes at kuentos.guam.net> wrote: > Subject: isohybrid binary not
in
> 6.03-pre18? (utils bt is in bios/utils?) Correct, it's in the bios/
> architecture binary directory.? 6.00 introduced efi32/ and efi64/
> making the distinction of the binaries necessary. --Gene
But these is no isohybrid in the efi directories? So, why wasn't the
isohybrid.c
also moved to bios/utils? 

Still don't know where to get or create the efiboot.img. Also not clear on
what
to do with any of the files in efi32? 



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On Jul 9, 2014 6:11 AM, "Michael D. Setzer II" <mikes at
kuentos.guam.net>
wrote:
>
> On 9 Jul 2014 at 6:01, Gene Cumm wrote:
>
> Date sent:      Wed, 9 Jul 2014 06:01:22 -0400
> Subject:        Re: [syslinux] isohybrid binary not in 6.03-pre18? (utils
bt is in bios/utils?)
> From:   Gene Cumm <gene.cumm at gmail.com>
> To:     "Michael D. Setzer, II" <mikes at kuentos.guam.net>
> Copies to:      Syslinux at zytor.com
>
> >
> > On Jul 9, 2014 5:15 AM, "Michael D. Setzer II"
> > <mikes at kuentos.guam.net> wrote: > Subject: isohybrid
binary not in
> > 6.03-pre18? (utils bt is in bios/utils?) Correct, it's in the
bios/
> > architecture binary directory.  6.00 introduced efi32/ and efi64/
> > making the distinction of the binaries necessary. --Gene
>
> But these is no isohybrid in the efi directories? So, why wasn't the
isohybrid.c
> also moved to bios/utils?
EFI  defaults to EFI/boot/boot <arch>.efi in the designated FAT file
system
for disk boot so there's no MBR boot code, the reason for isohybrid.

bios/ is for binaries only and gets wiped during certain cleanups.
> Still don't know where to get or create the efiboot.img. Also not clear
on what
> to do with any of the files in efi32?
efi32/efi/syslinux.efi (I believe that's its path) is the file that's
usable as bootia32.efi.

Do you have one of the few machines that's IA32 and not x64 for EFI?  What
type of boot are you looking to do?

--Gene

> 
> But these is no isohybrid in the efi directories? So, why wasn't the
isohybrid.c
> also moved to bios/utils? 
 
The source code is still in the same place; the binaries are 
generated into respective subdirectories.

I would suggest reading:
 http://www.syslinux.org/wiki/index.php/Library_modules 

 http://www.syslinux.org/wiki/index.php/Common_Problems#Multi-Arch 

and in the same "Common Problems" page you also have some notes about 
ELF and Modules.
> 
> Still don't know where to get or create the efiboot.img. Also not clear
on what
> to do with any of the files in efi32? 
> 
 
Basically (and please understand that I am not covering every single 
alternative but just the most common), the "ESP" is a FAT partition 
in a GPT media.

I would suggest reading about UEFI in general (e.g. from Wikipedia); 
for instance about the EFI System Partition ("ESP") and the default 
paths and names for EFI bootloaders (BOOTIA32.EFI, BOOTX64.EFI,...). 
Some Wiki pages in several Linux distros are also valuable, same as 
other EFI bootloaders' documentation.

WRT efiboot.img, that's currently not supported by Syslinux. 
Currently Syslinux cannot boot optical media in UEFI mode, unless 
(and perhaps if) the media is formatted with ISO9660+UDF and the 
particular UEFI supports booting UDF media (I have not actually 
tested this option, so it may or may not work).

You should be capable of transferring an ISO image to a (USB) drive 
containing at least one "ESP" and use Syslinux to boot it in UEFI 
mode.

Regards,
Ady.

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