Path: utzoo!attcan!uunet!ncrlnk!ncrcae!hubcap!gatech!rutgers!att!lzaz!hcj
From: hcj@lzaz.ATT.COM (HC Johnson)
Newsgroups: comp.os.minix
Subject: MINIX/ST Using only 4 partitions.
Keywords: BMS root partitions
Message-ID: <265@lzaz.ATT.COM>
Date: 10 Nov 88 20:19:32 GMT
Organization: AT&T ISL Lincroft NJ USA
Lines: 27



re: the problem of supporting a small root image on MINIX/ST.

What I did was change the driver, and steal the minor number 6.

After minor numbers 0-5 are set up from the boot block,
I create minor 6, by letting it reference the last 512 blocks of 
partition 3. (And, of course, reduce the size of partition 3 by 512.)

Now I can boot from 3,6 , and mount 3,3 as /usr.

The reason for taking the back 512 blocks is that I first loaded
3,3 with /usr in order to make the change.

Remember to use the -t in mkfs for the root, i.e.
mkfs -t /dev/hd6 512  (any number will do, just remember only 512 blocks
		       are real)

I also changed fsmain, so it automatically tries 3,6 for the root,
and if it fails then tries 2,0 and 3,3.

ALSO, I am using a BMS 100, and having no problems at all.

Howard C. Johnson
ATT Bell Labs
...lzaz!hcj