[ppc patch] fix Old World disk access

[Hollis Blanchard <hollis@penguinppc.org>]

This patch works around a bug in Old World Mac firmware. It allows "open" to
succeed but fails at least "seek" when disks are opened with a trailing ":0".
With the patch, we can get output like this:

grub> linux (scsi/sd,
Possible partitions are:        Partition num:0, Filesystem type Unknown
        Partition num:1, Filesystem type Unknown
        Partition num:2, Filesystem type Unknown
        Partition num:3, Filesystem type Unknown
        Partition num:4, Filesystem type Unknown
        Partition num:5, Filesystem type ext2

(The use of BAT mappings must be replaced before the kernel will boot, but
unfortunately that will have to wait for another day.)

-Hollis

2004-10-14  Hollis Blanchard  <hollis@penguinppc.org>

	* disk/powerpc/ieee1275/ofdisk.c (grub_ofdisk_open): Do not
	append ":0" to devpath if the GRUB_IEEE1275_NO_PARTITION_0 flag is
	set in grub_ieee1275_flags.

Index: disk/powerpc/ieee1275/ofdisk.c
===================================================================
RCS file: /cvsroot/grub/grub2/disk/powerpc/ieee1275/ofdisk.c,v
retrieving revision 1.4
diff -u -r1.4 ofdisk.c
--- disk/powerpc/ieee1275/ofdisk.c	13 Oct 2004 23:43:44 -0000	1.4
+++ disk/powerpc/ieee1275/ofdisk.c	15 Oct 2004 03:42:30 -0000
@@ -57,7 +57,9 @@
     return grub_errno;
 
   /* To access the complete disk add `:0'.  */
-  grub_strcat (devpath, ":0");
+  if (! (grub_ieee1275_flags & GRUB_IEEE1275_NO_PARTITION_0))
+    grub_strcat (devpath, ":0");
+
   grub_ieee1275_open (devpath, &dev_ihandle);
   if (! dev_ihandle)
     {