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[syslinux] 5.00 c32 dependencies paths

Keshav P R the.ridikulus.rat at gmail.com
Sun Dec 9 06:24:19 PST 2012 
On Sun, Dec 9, 2012 at 6:44 PM, Keshav P R <the.ridikulus.rat at gmail.com>wrote:

> On Sat, Dec 8, 2012 at 2:15 PM, Ady <ady-sf at hotmail.com> wrote:
>
>>
>> > On Sat, Dec 8, 2012 at 6:44 AM, Ady <ady-sf at hotmail.com> wrote:
>> > > The following is a list gathered from Syslinux 5.00 using the "ldd"
>> > > command under Linux.
>> > >
>> > > (Note: use a monospaced font for clarity.)
>> > >
>> > > advdump.c32:      statically linked
>> > > cat.c32:          statically linked
>> > > chain.c32:        libutil_com.c32
>> > >                   libcom32.c32
>> > > cmd.c32:          libcom32.c32
>> > > config.c32:       libcom32.c32
>> > > cpuid.c32:        statically linked
>> > > cpuidtest.c32:    libcom32gpl.c32
>> > > disk.c32:         libcom32gpl.c32
>> > > dmitest.c32:      libcom32gpl.c32
>> > > elf.c32:          libcom32.c32
>> > > entrydump.c32:    statically linked
>> > > ethersel.c32:     libcom32.c32
>> > > fancyhello.c32:   libutil_com.c32
>> > > gfxboot.c32:      libcom32.c32
>> > > gpxecmd.c32:      libcom32.c32
>> > > hdt.c32:          libutil_com.c32
>> > >                   libcom32gpl.c32
>> > >                   libcom32.c32
>> > >                   libmenu.c32
>> > > hello.c32:        statically linked
>> > > hexdump.c32:      libcom32.c32
>> > > host.c32:         libcom32.c32
>> > > ifcpu.c32:        libutil_com.c32
>> > >                   libcom32gpl.c32
>> > >                   libcom32.c32
>> > > ifcpu64.c32:      libcom32.c32
>> > > ifmemdsk.c32:     libcom32.c32
>> > > ifplop.c32:       libcom32.c32
>> > > kbdmap.c32:       libcom32.c32
>> > > keytest.c32:      libutil_com.c32
>> > > kontron_wdt.c32:  libcom32.c32
>> > > ldlinux.c32:      statically linked
>> > > libcom32.c32:     statically linked
>> > > libcom32gpl.c32:  statically linked
>> > > liblua.c32:       statically linked
>> > > libmenu.c32:      libutil_com.c32
>> > >                   libcom32.c32
>> > > libutil_com.c32:  statically linked
>> > > linux.c32:        libcom32.c32
>> > > localboot.c32:    libcom32.c32
>> > > ls.c32:           statically linked
>> > > lua.c32:          liblua.c32
>> > >                   libcom32gpl.c32
>> > >                   libcom32.c32
>> > > mboot.c32:        libcom32.c32
>> > > meminfo.c32:      statically linked
>> > > menu.c32:         libutil_com.c32
>> > > pcitest.c32:      libcom32.c32
>> > > pmload.c32:       libcom32.c32
>> > > prdhcp.c32:       libutil_com.c32
>> > >                   libcom32.c32
>> > > pwd.c32:          statically linked
>> > > pxechn.c32:       libutil_com.c32
>> > >                   libcom32.c32
>> > > reboot.c32:       libcom32.c32
>> > > resolv.c32:       statically linked
>> > > rosh.c32:         libutil_com.c32
>> > >                   libcom32.c32
>> > > sanboot.c32:      libcom32.c32
>> > > sdi.c32:          libcom32.c32
>> > > serialinfo.c32:   statically linked
>> > > sysdump.c32:      libcom32.c32
>> > > vesainfo.c32:     statically linked
>> > > vesamenu.c32:     libutil_com.c32
>> > >                   libcom32.c32
>> > > vpdtest.c32:      libcom32gpl.c32
>> > > whichsys.c32:     libcom32.c32
>> > > zzjson.c32:       libcom32gpl.c32
>> > >
>> > >
>> > For me ldd shows (Syslinux 5.00):
>> >
>> > /usr/lib/syslinux/bios/chain.c32:
>> > linux-gate.so.1 (0xf76f3000)
>> >  ../../com32/libutil/libutil_com.c32 => not found
>> > ../../com32/lib/libcom32.c32 => not found
>> >
>> > Instead of just showing
>> >
>> > /usr/lib/syslinux/bios/chain.c32:
>> > libutil_com.c32
>> > libcom32.c32
>> >
>>
>> The list I posted is not the exact result from ldd. I made the list
>> based on it. (BTW, the posted list might be displayed with a
>> different alignment format in different email clients. It may be
>> clearer to see in the ML archive
>> http://www.syslinux.org/archives/2012-December/018747.html .)
>>
>> > ldd is showing similar info for other *.c32 files. Why is it linked to
>> the
>> > build dir libcom32.c32 instead of $PWD/libcom32.c32 . Is something
>> wrong in
>> > Makefiles? I am getting similar ldd info for Syslinux firmware branch
>> efi64
>> > (v6.00-pre??) ? How do I fix this?
>> >
>>
>> The lib*.c32 files are dependencies in the sense that they are needed
>> for other *.c32 files to work. We are not talking here about
>> dependencies needed to build Syslinux in your system, nor to use the
>> SYSLINUX/EXTLINUX (for example) installer(s).
>>
>> The paths shown by the ldd command are the paths from the Syslinux
>> build in your system (or to boot your system with Syslinux?). The
>> list posted here just shows you which lib*.c32 files you need to copy
>> to the destination device where you are going to install, for
>> example, ldlinux.sys (for SYSLINUX/EXTLINUX) on it.
>>
>> So, for example, if you installed ldlinux.sys in a UFD, the installer
>> already copies ldlinux.sys and ldlinux.c32. If you want to use
>> menu.c32 too, then the UFD should contain (for this example):
>>
>>  ./boot/syslinux/ldlinux.sys
>>  ./boot/syslinux/ldlinux.c32
>>  ./boot/syslinux/menu.c32
>>  ./boot/syslinux/libutil_com.c32
>>  ./boot/syslinux/syslinux.cfg
>>
>>
> Not working. Statically linked elf modules like cat.c32 work just fine
> from "boot:" prompt, but modules dynamically linked to lib&.c32 files do
> not work. They give "Failed to load" message. I think this is due to
> hardcoded lib*.c32 paths in other elf modules. I alo tried Syslinux
> 6.00-pre efi64
>
>     /EFI/syslinux/syslinux.efi
>     /EFI/syslinux/syslinux.cfg
>     /EFI/syslinux/*.c32 (including lib*.c32)
>
> Syslinux reads syslinux.cfg so I guess the issue is not in detecting the
> CWD (since otherwise it wouldn't load ldlinux.c32 and syslinux.cfg . For
> some reason in the "boot:" prompt typing any LABEL defined in syslinux.cfg
> boots linux kernel just fine (even though linux.c32 depends on libcom32.c32"
>
>
>> because menu.c32 needs libutil_com.c32 (as listed by ldd). Without
>> libutil_com.c32, menu.c32 fails. The "/boot/syslinux/" path is the
>> "installation directory" just for this example. Since syslinux.cfg is
>> also there, in the installation directory, that directory is going to
>> be the "Current Working Directory" when you first boot that UFD.
>>
>> When you boot with that UFD, if the syslinux.cfg file contains "UI
>> menu.c32", then menu.c32 will be able to use libutil_com.c32 located
>> in that same directory and should show you the boot menu.
>>
>>
> Both menu.c32 and vesamenu.c32 fail to load because of lib*.c32 error. I
> even added
>
>     PATH /EFI/syslinux:/boot/syslinux:/syslinux
>
> as very first line of /EFI/syslinux/syslinux.cfg . Since this issue is
> originally from elflink branch, it should be fixed there and merged into
> firmware branch.
>
>
>
>> This is a very simple example, just to give a general basic idea. In
>> this simple case, the PATH directive is not needed, as the lib*.c32
>> file(s) is (are) located in the same directory as the installation
>> directory (where ldlinux.sys was installed), which is also where
>> syslinux.cfg is located, which is the initial CWD when booting with
>> this UFD.
>>
>>
>> > The new PATH directive is used in the cfg files to point to the
>> > > location of the lib*.c32 files, just in case that location is not the
>> > > "Current Working Directory".
>> >
>> >
>> > Any example of how to use PATH in syslinux.cfg ?
>> >
>> > Regards.
>> >
>> > Keshav
>>
>> The general explanation about the new PATH directive can be found in
>> the Syslinux 5.00 package in syslinux.txt. Look for the PATH
>> directive and PATH rules.
>>
>> I have found some problems in 5.00, which I reported to the ML
>> already. If there are more difficulties, and the above basic example
>> (and the syslinux.txt file) are not enough (and they might not be),
>> just start a new email thread in the ML with the specific case. I'm
>> not sure _I_ am going to know the answer, but maybe someone will.
>>
>> HTH,
>> Ady.
>>
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>>
>>
> Regards.
>
> Keshav
>

Build Logs - elflink branch - for BIOS - http://sprunge.us/PDjH
                  firmware branch - efi64 build -
http://dl.dropbox.com/u/9710721/syslinux-firmware-efi64-build-log.txt

Regards.

Keshav
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