diff options
| -rw-r--r-- | distrib/notes/sparc/prep | 67 |
1 files changed, 57 insertions, 10 deletions
diff --git a/distrib/notes/sparc/prep b/distrib/notes/sparc/prep index 8babd05a956..e77da8c9abe 100644 --- a/distrib/notes/sparc/prep +++ b/distrib/notes/sparc/prep @@ -18,19 +18,28 @@ Unlike SunOS and the OpenBOOT ROM, a generic OpenBSD kernel numbers scsi drives sequentially as it finds them. The drive with the lowest scsi-id will be called sd0, the next one sd1, etc. -To ease the installation process, the default OpenBSD kernel in the -distribution is setup to match the Sun mapping above by hard-wiring -scsi-id#3 to sd0 and scsi-id#0 to sd3. The remaining drives will be -dynamically mapped to other sd* numbers. +To ease the installation process, two OpenBSD kernels are provide in +the installation sets. The default OpenBSD kernel (bsd) is set up +to use the OpenBSD mapping, while a special kernel (bsd.scsi3) is +set up to match the Sun mapping above by hard-wiring scsi-id#3 to sd0 +and scsi-id#0 to sd3. The remaining drives will be dynamically mapped +to other sd* numbers. -A truely generic OpenBSD kernel is also provided as `/bsd.GENERIC', -which will do the standard OpenBSD probe ordering. If your configuration -differs from the default Sun setup, you can try to use this kernel to -complete the installation. +This is mostly a non-issue if you have only one drive on your system, +but can get really confusing if you have multiple drives. If you plan +to eliminate SunOS altogether it may be best to correct the scsi-id's +of your drives, while if you plan to leave SunOS installed, it may +be better to install OpenBSD on an external drive with scsi-id 1 or 0. -NOTE: this is also a concern when you start building your own customised -kernels. +Some OpenBoot proms provide and environment variable that controls +the drive<->scsi-id mapping, you can change this to reflect the natural +ordering or just set the boot related variables to boot from the +correct drive, whatever the numbering. +NOTE: if you elect to build a custom kernel you may want to "hardwire" +the scsi-id's to sd0->scsi-id 0 or your desired scheme, this helps +prevent accidents if you change the SCSI bus configuration or a drive +is down. Your OpenBOOT ROM may need some setup. make sure you boot from `new command mode'. If your machine comes up and gives you a `>' prompt @@ -47,3 +56,41 @@ Also, you cannot use the security modes of the sparc OpenBOOT ROM. ok setenv security-mode none + +Please note that while OpenBSD and SunOS have a reasonable degree of +compatibility between filesystems and OpenBSD can even run SunOS +binaries (when built with COMPAT_SUNOS), there are some problems to +watch out for. + + If the OpenBSD fsck(8) utility is used on a SunOS filesystem, it will + set OpenBSD "clean flags" and BSD4.4 summary fields in the Superblock. + SunOS will *not* like this, you will have to do a fsck -b 32 under + SunOS to access an alternate superblock to fix the filesystem. You + should always specify SunOS filesystem with "0" in the "fsck passno" + field in /etc/fstab to prevent this, and preferably mount them "RO". + + If SunOS fsck is used on an OpenBSD filesystem in the default OpenBSD + new format (4.4BSD) it will first complain about the superblock and + then about missing . and .. entries. Do *not* try to "correct" these + problems, as attempting to do so will completely trash the filesystem. + + +OpenBSD supports both OpenBSD "native" disklabels and "Sun compatible" +disklabels. Unless you have some really good reason, you should stick +with the Sun compatible labels. The disklabel(8) "-r" says to use +OpenBSD labels, which is a bit counter-intuitive and contrary to the +reasons why you'd use "-r" on other OpenBSD ports. Don't use "-r"... + +The OpenBSD "Sun Compatible" disklabel are extended to support 16 partitions, +which may be compatible with Solaris, but older SunOS format(8) programs +only see the first 8 parititions and may "lose" information on the extended +paritions. Use SunOS format(8) only with *extreme* caution on drives that +contain OpenBSD partitions. + + +OpenBSD and Sun BSD bootblocks are similar, though differnt. You can use +Sun bootblocks, but the OpenBSD bootblock are architecture independent +and understand the extended disklabels. To install OpenBSD bootblocks, +you must use the OpenBSD installboot and vice versa. + + |