[syslinux] Syslinux 5.10pre1 - Failed to load COM32 file .c32

Mattias Schlenker ms at mattiasschlenker.de
Wed Mar 13 05:14:41 PDT 2013

Hello everyone,

Since I have some some adventures in UEFI PXE booting ahead I tried to 
go with the latest syslinux development snapshot in this case 5.10pre1. 
But I already fail when booting from CD with

    Failed to load COM32 file .c32

I am a bit perplex since no name of COM32 files is given. I am trying to 
trace down the issue as good as I can. COM32 files present are:


Every build gets fresh COM32 files and an isolinux.bin from the same 
syslinux version. The isolinux.cfg calls ifcpu64.c32 to select either a 
64 bit kernel, a PAE enabled kernel or a kernel without PAE. 
isolinux.cfg reads:

DEFAULT switch

LABEL switch
         COM32 /boot/isolinux/ifcpu64.c32
         APPEND sifomenu -- paemenu -- nopamenu

LABEL paemenu
         COM32 /boot/isolinux/vesamenu.c32
         APPEND /boot/isolinux/common/paemenu.cfg

LABEL nopamenu
         COM32 /boot/isolinux/vesamenu.c32
         APPEND /boot/isolinux/common/nopamenu.cfg

LABEL sifomenu
         COM32 /boot/isolinux/vesamenu.c32
         APPEND /boot/isolinux/common/sifomenu.cfg

Manually calling the vesamenu.c32 COM32 at the boot prompt works with 
relative and absolute paths:

    boot: vesamenu.c32 common/sifomenu.c32
    boot: /boot/isolinux/vesamenu.c32 /boot/isolinux/common/sifomenu.c32

I am scratching my head, since calling

    boot: sifomenu

fails which indicates that isolinux itself does not find (or correctly 
interpretes) its isolinux.cfg. Syslinux was built with GCC 4.7.2 and 
NASM 2.10.7 - but the problem remains when using the .c32 files and 
isolinux.bin from the official release. 5.02pre3 (built with the same 
compilers) does not show this issue. There is no /isolinux directory, 
nor are there syslinux.cfg anywhere. Were there changed dependencies 
when moving from 5.02pre3 to 5.10pre1? The only added (binary) COM32 
seems to be cptime.c32, but this does not mean that there a no new 
dependencies on already present COM32 files.


Mattias Schlenker - Redaktion + EDV-Beratung + Linux-CD/DVD-Konzepte
Dietrich-Bonhoeffer-Str. 3 - 40667 MEERBUSCH - GERMANY

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