On Sat, Nov 23, 2013 at 02:32:47PM -0500, Alan Feuerbacher wrote: > > In grub.cfg, why is the "root" in the line "set root=(hd1,1)" different > from the "root" in the line "linux /vmlinuz-3.12-lfs-SVN-20131119 > root=/dev/sdb3 ro"? In other terms I have: > > /dev/sdb1 -> /boot > /dev/sdb3 -> / > > I'm really fuzzy about this stuff. >
They are totally different things. Grub purports to be a universal bootloader, and there is no consistent way of naming disk devices across different systems, so it uses its own names. For the linux kernel bootargs, root= expresses which partition to load for '/', using the linux kernel's naming system. > At any rate, I recompiled the kernel and reinstalled the grub stuff. I'm > still getting an error: > > error: file '/vmlinuz-3.12-lfs-SVN-20131119' not found. > > I invoked the grub command line to see what I could see: > > ls => (hd0) ... (hd1) (hd1,msdos2) (hd1,msdos1) (hd2) > > So grub apparently sees my disk /dev/sdb as (hd1). Next I tried: > > ls (hd1) => > Device hd1: No known filesystem detected - Total size 3907029168 sectors > > I also tried this with (hd0) and (hd2). Same response: no filesystem > detected. > > So for whatever reason, grub is not recognizing the disks. Having tried > the same thing with the two other disks, /dev/sda and /dev/sdc, which > grub lists above as (hd0) and (hd2), I'm at a loss. All three of these > disks are in operation, since when I fire up Fedora19 on /dev/sda, I can > write to and read from all of the disks. > > Any ideas? > > Alan How about ls (hd1,1) ? hd0 and hd1 are the whole disk, what you need to look at is a partition. I've also got a much-less-important comment on your kernel names as a reply to your earlier post: You had four variants of 3.12 lfs kernels. All of them had the same size in bytes, one was from nearly two days before the rest, of the others two had the same time and the other was a second later. To me, that looks unusual : Mostly, a fresh build with different options will produce a kernel with a slightly different size. It's not impossible that minor changes might produce same-size binaries, but obviously with different md5sums. But when I see three kernels with essentially the same time I start to worry - I don't think even the fastest machines can produce an updated kernel so quickly. ĸen -- das eine Mal als Tragödie, dieses Mal als Farce -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
