Installing Solaris 8 to dual boot with Linux on x86

Related reading:

Here's a log of what I had to do:

Insert CD-ROM. Reboot as many times as it takes for the boot to make it past the 'Cannot find boot.bin' error (my media appears to be damaged; probably my fault). Took me 8 tries.
The install fails quickly if I tell it the computer has a network card, so lie and say it's non-networked.
Choose manual disk layout. After struggling with the mysterious user interface, discover that it doesn't support extended partitions. Reboot to Linux and run gnu parted to resize the extended partition to give back the unused space at the end so Solaris can create a primary partition with it. Happily, Red Hat 7.3 installs gnu parted by default, and since I was just manipulating free disk space, I could do it with the OS running and all partitions mounted. Lucky me.
Reboot with Solaris cd-rom many times until it gets past the 'Cannot find boot.bin' error.
Install Solaris normally, preserving other operating systems.
Reboot. Nice Solaris boot menu supposedly lets me reboot to either Linux or Solaris, but when I pick Linux, it says 'bad signature'.
On a working computer, read
Boot with Red Hat 7.3 cdrom, choose rescue mode. I did 'chroot /mnt/sysimage' as it suggested, not sure that's truly needed.
Add an entry for Solaris in /etc/grub.conf (I installed Solaris in the 3rd primary partition on the first disk, hence hd0,2):
```
title Solaris
        rootnoverify (hd0,2)
        makeactive
        chainloader +1
```
Re-install grub's MBR according to the grub documentation; it's something like
```
# grub
(grub) root (hd0,0)
(grub) setup (hd0)
(grub) quit
```
My network card is an RTL-8139; sees that Sun doesn't support that, even though on Linux it's common and well-supported. A good place to look for tips is Usenet's alt.solaris.x86 and comp.unix.solaris, searchable via the excellent groups.google.com. That pointed me to Realtek's site, which has a Solaris driver for at least one flavor of this card. No idea if it works.

I have yet to get networking going, but at least everything boots, and Linux still works.

I can see why Sun is giving up on Solaris x86; the driver support issue is obviously difficult for them, and if Linux does such a better job, nobody's going to bother with Solaris.