On Sunday 16 July 2006 06:26, Mikkel L. Ellertson wrote: > nigel henry wrote: > > I'v actually just got FC1 to boot from the main bootloader in hda, but > > that is from a kernel entry, not the chainloader. All I get from trying > > to chainload is a grub prompt. > > > > Running /sbin/grub I tried different drives to see if grub> root (hdx,0) > > would find somewhere to put FC1's bootloader. grub> root (hd2,0) printed > > the following, after also running grub> setup (hd2). > > > > grub> root (hd2,0) > > Filesystem type is ext2fs, partition type 0x83 > > > > grub> setup (hd2) > > Checking if "/boot/grub/stage1" exists... yes > > Checking if "/boot/grub/stage2" exists... yes > > Checking if "/boot/grub/e2fs_stage1_5" exists... yes > > Running "embed /boot/grub/e2fs_stage1_5 (hd2)"... 15 sectors are > > embedded. succeeded > > Running "install /boot/grub/stage1 (hd2) (hd2)1+15 p > > (hd2,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded > > Done. > > > > There's some weird stuff going on here, as (hd2) hdc, is the cdwriter, > > and when I ran grub> setup (hd2) the writers light was flickering quite a > > bit, but as you can see from the output above, the bootloader installed > > ok. > > The CD is not a hard drive. Grub does not care about the interface, > just about the BIOS numbering. A SCSI hard drive would also show up > as (hdx). For that matter, my SATA hard drive is (hd0) under Grub, > and /dev/sda under Linux. Yes the BIOS numbering compared to the /dev entries, caused the confusion, resulting in the ridiculous scenario of trying to force Grub to install on (hd4) a truly non-existant disc. > > > Another thing that is a bit weird, is that the kernel entries in > > grub.conf, apart from the latest from fedora legacy show a strange entry > > after label=/. Again, as below. > > LABEL=/ hdc=ide-scsi (perhaps this has something to do with Win ME > > identifying the IDE PCI adaptor card as a scsi controller) > > > > I've never seen that before. > > NO, it is using SCSI emulation for the CD-ROM drive, so that you can > access it as a SCSI CD. This used to be used a lot with CD writers. > FC1 is probably old enough that it still needs it. I don't remember > what version of the kernel/cdrecord let you use the IDE command set > to control a CD writer. > > > Quite what the situation is with the cdwriter now, I don't know. It > > wasn't showing up in the mobo's BIOS before. Only the cdrom drive (hdd), > > and the dvdrom (hdg) which I couldn't boot a distro from were there. > > > > As I can boot an FC1 kernel from the main bootloader, the harddrive on > > the IDE PCI adaptor card is obviously accessable, but there is obviously > > some problem with the BIOS regarding drive ID's. Webmin on FC1 still > > shows the harddrive on the IDE PCI adaptor card as IDE device E, and yet > > the mobo's BIOS is identifying this same harddrive as hdc. > > > > Anyway, the only problem left now is accessing the Grub menu. I've been > > back into FC1, and changed the splashimage from (hd4,0) to (hd2,0), but > > still only get the Grub prompt when trying to chainload to (hd2,0) hdc1, > > aka hde1. > > > > Nigel. > > One thing to keep firmly in mind is that the /dev/hdx device entries > are not the same as the BIOS hard drive or Grub numbering. As far as > the BIOS is concerned, the first hard drive it finds is device 80, > then second one 81, and so on. It gets interesting when you have > both SCSI and IDE drives in the same system, because if the system > is set to boot off the SCSI controller, then the first SCSI drive > will be BIOS 80, Grub (hd0). Also, if you tell the BIOS to boot off > a hard drive other then the first one, the numbering changes. I have > not checked into it, but it would be interesting to see how the > drives are numbered when you boot off of a USB drive. Thankfully I only have IDE drives, no doubt more knowledge of how Grub works, would have saved a lot of time and hair removal. > > Mikkel Thanks for all your friendly help. Nigel. > -- > > Do not meddle in the affairs of dragons, > for thou art crunchy and taste good with Ketchup!
