[syslinux] Problems with gfxboot.c32

Andreas Heinlein aheinlein at gmx.com
Wed Jul 3 23:45:33 PDT 2013

Am 03.07.2013 23:05, schrieb Sebastian Herbszt:
> Matt Fleming wrote:
>> On Wed, 03 Jul, at 09:53:32PM, Sebastian Herbszt wrote:
>>> gfxboot.c32 is supposed to work as expected if you put all required 
>>> files
>>> inside the bootlogo archive.
>> From reading com32/gfxboot/gfxboot.c, the code in the bootlog archive
>> calls *out* into a realmode section compiled into gfxboot.c32
>> (realmode_callback.asm) to do things like open files, read sectors, etc.
>> It's these utility functions that no longer work.
> Calls to those functions only happen if the gfxboot core (bincode.asm) 
> requests them.
> cb_status, cb_fopen and cb_fread are only called from gfxboot core 
> (prim_findfile) if
> the requested file is not part of the bootlogo archive.
> cb_getcwd is deprecated, cb_chdir and cb_mount were never supported on 
> upstream syslinux.
> The only function left is cb_readsector which seems optional in 
> gfxboot core.
> There should be no loss of functionality if required files are part of 
> the bootlogo archive.
> Sebastian
Looks like you're right. I added '*.tr *.hlp *.pcx back.jpg gfxboot.cfg 
langlist' to the 'bootlogo' archive, and now I get the menu, and 
everything seems to work!

If that's really the only problem, I wouldn't consider this a bug. IIRC, 
the 'unpacked' form of gfxboot archives is a special case of SYSLINUX 
anyway, grub expects/needs the files in their packed form. Then this 
change just needs to be documented somewhere


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