September 2002 - Packet Writing - openSUSE Mailing Lists

Re: booting to pcktcdvd
by James Blanford 03 Sep '02

03 Sep '02

--- On Mon 09/02, Massimo Dal Zotto wrote: > > I tried to do a similar thing with an iso9660 rescue + a r/w udf > filesystem > on the same cdrw but I couldn't make it bootable. Did you succeed in > booting > from your cdrw? If udf compatible with the El Torito standard? > > Another thing that doesn't work for me is creating an udf filesystem in > the > second session. > No, I boot from a kernel on a floppy disk. Then I load a small file system from a second floppy disk just so that I can register /dev/pktcdvd0. Finally I change root to the r/w udf system. I have only one session on the CD R/W disk which contains the entire file system. Once I've chroot to the CD R/W, I can take the floppy out and forget it. It works, but I have occasional corruption problems. Your idea sounds good, but I have no idea how to put udf on a second session. I think you would have the same problem as I do. After booting with an iso9660 file system, ioctl would prevent you from registering /dev/pktcdvd0 since the device file would be on a read only (iso9660) file system. Good Luck, - Jim ------------------------------------------------ Changed your e-mail? Keep your contacts! Use this free e-mail change of address service from Return Path. Register now!

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booting to pcktcdvd
by James Blanford 02 Sep '02

02 Sep '02

So, the reason I need symlinks working is that I'm playing with a little Linux system with it's root file system on a packet writing CDRW. I could say it would make a nifty rescue system that could be updated or an experimental device for testing systems that could damage the file system medium or a guest system so you could operate Linux on someone else's computer without affecting their hard drive. But really I just thought it would be fun. One trouble is bootstrapping. I can't boot directly to /dev/pktcdvd0, since it requires user space registration. /dev/sg0 is a character device. I can boot to /dev/scd0, but when I try to register /dev/pktcdvd0, I get a message from ioctl saying it can't be done with the device existing on a read only sytem. So I have to boot to an initial RAM disk and change root. I really don't like doing it that way. I can't free the RAM disk, probably because the actual pktcdvd0 and scd0 device files are on the RAM disk. Since busybox init can only be run by the kernel, I have to add another init layer and I can't shut down properly. So, could ioctl be hacked to let me register pktcdvd? Shouldn't this registration of a device be done in kernel space anyway? I'm guessing that pktsetup is a interim solution until you decide how to get packet writing into the main stream. Anyway, all thoughts would be appreciated. Like I said, I'm just playing around. - Jim ------------------------------------------------ Changed your e-mail? Keep your contacts! Use this free e-mail change of address service from Return Path. Register now!

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packetwriting how after compiling and inserting the new modules?
by Guy Forssman 01 Sep '02

01 Sep '02

Hi there, I have a Mandrake 8.2 (sorry!) on a pentium II 300 MHZ laptop running. I have a parallel external cdwriter I have a usb multimemory reader/writer (MMC & SD, SmartMedia,compactFlash and Memory Stick) I have a internal DVD I was able to compile 2.4.19 with packetwriting and UDF suport I inserted the pkcdvd module and udf module cdrecord -scanbus gives me host 0 the dvd host 1 Multimemory reader/writer host 2 HP 7510e cd writer When I use xcdraost I can burn to my external writer I can also write and read to multimemory reader/writer I can also read dvd's How can I do packetwriting to the CD-WRITER? /dev/scd0 points to my dvd and there's no /dev/scd1. In fact I can't find any file in the /dev directory wich is pointing to my host2? thanks in advance Guy Forssman

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