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This work has been sponsored by Plutotech International, Inc (who paid the initial work), and interface business GmbH (where i did most of the work). A big thanks also goes to Bruce Evans, for his continuing help and answering my stupid questions. The code is basically functioning, with the following caveats: . Rock Ridge attributes are not yet supported. . Only SCSI CD-ROMs are supported, since i fail to see any possibility to determine the drive type using BIOS functions. (Even for hard disks, this determination is done by a big hack only.) . El Torito specifies a lot of crap and useless misfeatures, but crucial things like the ability to figure out the CD TOC have been ``forgotten''. Thus, if you wanna boot a multisession CD, you need to know at which CD block your session starts, and need to speciffy it using the @ clause. . None of the CD-ROM controllers i've seen so far implements the full El Torito specification at all. Adaptec is probably the closest, but they miss on non-emulation booting (which would be the most logical choice for us). Thus, the current code bloats the 7.5 KB boot code up to 1.44 MB, in order to fake a `floppy' image. If you wanna use it, specify this file as the boot image on the command-line of the mksiosfs command (option -b). Caveat emptor: some versions of the Adaptec BIOS might even fail to access the CD-ROM at all, using the BIOS functions. I think i've notice this for ver 1.26, the code has been tested with ver 1.23. The boot string is as follows: [@sess-start] [filename] [-flags] sess-start Extend # where the last session starts, measured in CD-ROM blocks. filename As usual, but the input is case-insensitive by now (since we don't grok RR anyway). flags As usual, but -C (use CDROM root f/s) is default, so specifying -C will decactivate this option (which is probably not what you want :). A lot of cleanup work is probably required, and some of the files could/should be merged back to biosboot, perhaps made conditional on some #ifdef. The malloc implementation that comes with cdboot might also be useful for kzipboot. (I needed a malloc() since the root dir ain't fixed in size on a CD.) I've been testing all this with a 2.2-STABLE as the base for biosboot. I don't expect too many surprises, although i know the biosboot stuff has been changed a lot in -current lately. I'm sure Bruce will comment on all this here anyway. :-)
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