Date: Fri, 22 Jan 1999 11:08:12 +1100 From: Peter Jeremy <peter.jeremy@auss2.alcatel.com.au> To: dcs@newsguy.com, tmb@rcru.rl.ac.uk Cc: current@FreeBSD.ORG Subject: Booting from 2nd IDE [Re: Experiences with aout-to-elf and new bootblocks] Message-ID: <99Jan22.110737est.40377@border.alcanet.com.au>
next in thread | raw e-mail | index | archive | help
"Daniel C. Sobral" <dcs@newsguy.com> wrote:
>Well, kind of. You "hard code" the name wd2 in your kernel
>configuration file. [...] Ie, s/wd2/wd1/
> in your kernel configuration file (and rebuild :).
It was wd0 (the generic). Making it wd2 didn't help.
Mark Blackman <tmb@rcru.rl.ac.uk> wrote:
>FWIW, I've done it under 2.2.7 by
>
>1) installing booteasy on both wd0 *AND* wd2
>2) altering the boot.config to
> 1:wd(2,a)kernel
This works for an a.out 3.0 kernel, but the old bootloader can't handle
ELF kernels, so this isn't a usable solution.
>3) compiling above kernel with
> config kernel root on wd2
This made no difference.
Since typing on a keyboard is easier than opening the box, I wrote the
following kludge. It builds a bitmap of IDE devices as it probes them
and then counts active IDE devices to work out the actual unit number.
Index: i386/autoconf.c
===================================================================
RCS file: /home/CVSROOT/./src/sys/i386/i386/autoconf.c,v
retrieving revision 1.110
diff -u -r1.110 autoconf.c
--- autoconf.c 1998/10/26 07:05:34 1.110
+++ autoconf.c 1999/01/21 23:18:18
@@ -433,6 +433,10 @@
#define FDMAJOR 2
#define FDUNITSHIFT 6
+/* KLUDGE for bios handling of multiple devices */
+#define WDMAJOR 0
+int wd_mask = 0; /* mask of WD devices found during probe */
+
/*
* Attempt to find the device from which we were booted.
* If we can do so, and not instructed not to do so,
@@ -467,6 +471,18 @@
slice = COMPATIBILITY_SLICE;
part = RAW_PART;
mindev = unit << FDUNITSHIFT;
+ } else if (majdev == WDMAJOR) {
+ /*
+ * XXX kludge to handle holes in numbering
+ */
+ for (part = 0, mindev = unit; part < 32 && mindev >= 0; part++)
+ if (wd_mask & (1 << part))
+ mindev--;
+ if (mindev == -1)
+ unit = part - 1;
+
+ part = B_PARTITION(bootdev);
+ mindev = dkmakeminor(unit, slice, part);
} else {
part = B_PARTITION(bootdev);
mindev = dkmakeminor(unit, slice, part);
Index: isa/wd.c
===================================================================
RCS file: /home/CVSROOT/./src/sys/i386/isa/wd.c,v
retrieving revision 1.186
diff -u -r1.186 wd.c
--- wd.c 1999/01/17 05:46:24 1.186
+++ wd.c 1999/01/21 23:18:18
@@ -223,6 +223,8 @@
static struct buf rwdbuf[NWD]; /* buffers for raw IO */
#endif
+extern int wd_mask; /* This is a KLUDGE */
+
static int wdprobe(struct isa_device *dvp);
static int wdattach(struct isa_device *dvp);
static void wdustart(struct disk *du);
@@ -551,6 +553,8 @@
DEVSTAT_NO_ORDERED_TAGS,
DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_IDE);
+ /* KLUDGE: mark drive as present */
+ wd_mask |= 1 << lunit;
} else {
free(du, M_TEMP);
wddrives[lunit] = NULL;
-------------
This successfully allows me to boot from wd2. I agree that it doesn't
address the general problem (in particular, it can't handle the case
where the BIOS doesn't see a device that the kernel probe does see,
and doesn't support SCSI).
Peter
--
Peter Jeremy (VK2PJ) peter.jeremy@alcatel.com.au
Alcatel Australia Limited
41 Mandible St Phone: +61 2 9690 5019
ALEXANDRIA NSW 2015 Fax: +61 2 9690 5982
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?99Jan22.110737est.40377>