--- Em seg, 19/5/08, Thomas Schmitt <[EMAIL PROTECTED]> escreveu:
> I don't know whether a bootable appendable media stays
> bootable with
> -dev /dev/cdrom
> rather than -indev ... -outdev ... .
> This would add a session to the media. The session
> would hold a new directory tree, a new boot sector
> and the data blocks of the new or overwritten files.
An image that remains bootable with -indev -outdev should remain bootable with
-dev too (Note we only deal with el-torito images). El-Torito has specific
support for multisession images, it tries to locate a valid boot sector in the
last session. On emulated multisession (such as DVD+RW) the new boot sector is
placed propertly at the begining of the image, so it works too.
As far as I know, to keep the image bootable:
- We have to figure out the size of the boot image (this means, it must appear
in the ISO-9660 directory tree),
- The boot image should work with the newly generated directory tree. This is
the hard point. A boot image is arbitrary executable code that gets loaded into
RAM at boot time and then executed. If that code assumes some disc directory
structure, it won't work, unless we were clever enought to modify the code
propertly. At this time, libisofs is only able to modify isolinux code, but it
cannot detect a boot image is isolinux, so you need to tell it about that, with
isolinux and patch options.
Cheers,
Vreixo
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