[syslinux] ifcpu64.c32 not working properly when used in a menu include file

[Gert Hulselmans]

2012/9/4 John Newman <jnnewman at peer1.com>:
> The following is a pxelinux problem, specifically to do with
> including config files with the menu include directive and the
> ifcpu64.c32 com module.
>
> I have a working ifcpu64.c32 setup that jumps to the label rescue64
> in the case of a 64-bit CPU. The label "rescue64" defines a 64-bit
> kernel and a 64-bit initrd.img. The setup jumps to a label named
> "rescue32" in the case of a 32-bit CPU, which is also a label, this
> time defining a 32-bit vmlinuz and a 32-bit initrd.img/userland.
>
> It looks more or less like the following:
>
> # rescue_dev
> LABEL rescue
>   IPAPPEND 2
>   MENU LABEL ^rescue (Auto-detect CPU type)
>   KERNEL ifcpu64.c32
>   APPEND rescue64 -- rescue32
>   TEXT HELP
>      Load appropriate image
>   ENDTEXT
> LABEL rescue64
>   MENU HIDE
>   IPAPPEND 2
>   KERNEL images/vmlinuz64
>   APPEND initrd=images/initrd64.img init=/linuxrc root=/dev/ram0 rw
> devfs=nomount console=ttyS0,115200 console=tty0 ksipaddr=kickstart
> LABEL rescue32
>   MENU HIDE
>   IPAPPEND 2
>   KERNEL images/vmlinuz32
>   APPEND initrd=images/initrd32.img init=/linuxrc root=/dev/ram0 rw
> devfs=nomount console=ttyS0,115200 console=tty0 ksipaddr=kickstart
>
>
> This all works perfectly when the code above is directly
> in the pxe target file that is being used. However, when I use the
> "MENU INCLUDE" directive in a file that defines some more
> options to suck this bit in, the label parsing/jumping by ifcpu64.c32
> stops working properly. When I select the "rescue (Auto-detect CPU
> type)" option from the menu, instead of jumping to the label
> rescue64, it tries to shove first the literal file rescue64 at me,
> then when that isn't found it looks for rescue64.cbt, rescue64.0,
> rescue64.com, rescue64.c32 and maybe a few others. Basically,
> it is ignoring the rescue64 label and trying to directly spit
> a rescue64 file out at me. I can see this from the tftpd logs.
>
> Has anyone else seen similar behaviour? Any tips or ideas?
>
> Greatly appreciated,
> John
>
> --
> John Newman
> Product Engineering - Peer1 Hosting
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Hi John,

Can you try with:
  INCLUDE filename
instead?

In Syslinux versions lower than 5, there are 2 config parsers:
  - one in the core, written in assembler
  - one in (vesa)menu.c32, written in C

Only (vesa)menu.c32 processes MENU ... keywords.
The config parser in C doesn't see your MENU INCLUDE.

When ifcpu64.c32 is called, it only sees the LABELs that are seen by the
core config parser, and is thus unaware of everything specified in the file
that you included with MENU INCLUDE.

- Gert