Removal of GEOM_BSD, GEOM_MBR, GEOM_PC98 and GEOM_SUNLABEL
Marcel Moolenaar
xcllnt at mac.com
Thu Apr 2 21:44:10 PDT 2009
On Apr 2, 2009, at 6:35 PM, Tai-hwa Liang wrote:
> On Thu, 2 Apr 2009, Marcel Moolenaar wrote:
>> Can you dump the first 2 sectors of slice 3 and
>> send it to me:
>> dd if=/dev/ad0s3 of=/tmp/dump.dd count=2 bs=512
*snip*
> 000001b0 00 00 00 00 00 f2 0e 00 00 00 00 00 00 00 00 01
> |................|
> 000001c0 c1 ff 83 ef ff ff 3f 00 00 00 21 17 00 01 00 00
> |......?...!.....|
> 000001d0 c1 ff 05 ef ff ff 60 17 00 01 b0 a8 fe 02 00 00
> |......`.........|
> 000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> 000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa
> |..............U.|
*snip*
It looks like you have a boot menu entry at 0x1b6. Can you
try the following patch:
Index: g_part_ebr.c
===================================================================
--- g_part_ebr.c (revision 190655)
+++ g_part_ebr.c (working copy)
@@ -403,9 +403,13 @@
if (magic != DOSMAGIC)
goto out;
- /* The sector is all zeroes, except for the partition entries. */
+ /*
+ * The sector is all zeroes, except for the partition entries
+ * and a possible IBM Boot Manager menu entry. The menu entry
+ * is 9 bytes in length and preceeds the partition entries.
+ */
sum = 0;
- for (index = 0; index < DOSPARTOFF; index++)
+ for (index = 0; index < DOSPARTOFF - 9; index++)
sum += buf[index];
if (sum != 0)
goto out;
The real fix will be a bit more involved, because we should
avoid wiping out the boot menu entry on a write. But at least
with the patch you should be able to read the EBR.
Thanks,
--
Marcel Moolenaar
xcllnt at mac.com
More information about the freebsd-current
mailing list