On Wed, 17 Jun 2009, Rick C. Petty wrote: > On Tue, Jun 16, 2009 at 11:50:38PM +0930, Daniel O'Connor wrote: > > Unfortunately I can't get the loader to read a FAT partition which > > surprises me because I think it should be able to.. I believe that > > libstand can do it (I can see the code :) however when I list the > > USB stick device I get an empty directory listing. > > I read somewhere that there isn't enough space in the boot2 loader to > put such logic. You're only guaranteed 15 512-byte sectors or 7680 > bytes, if you use any UFS partition. It's pretty tight; I think you > will find it difficult to insert another file system in there, > especially one as complicated as msdos. libstand is 223 KB, so it's > not as trivial as you think. > > Theoretically it would be possible: for example, if you're willing to > set aside a separate partition you would have as much room as you > want. Or if you put it at the front of a UFS partition, you have > just under 256 KB of room since our UFS code will search for the > superblock at a byte offset of 262144, but there aren't any knobs to > newfs so you'd have to hack it together. Take a look at > /usr/src/sys/boot/i386/boot2/ for starters.
In effect I will be doing that, I can make a syslinux memdisk which holds boot0/1/2 + loader in a UFS partition. I would just prefer to be able to read the kernel, modules & MFS root off FAT32. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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