Author: marius
Date: Sun Jan 29 12:52:36 2012
New Revision: 230735
URL: http://svn.freebsd.org/changeset/base/230735
Log:
MFC: r228024
Update comment.
Modified:
stable/8/sys/sparc64/sparc64/ata_machdep.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/sparc64/sparc64/ata_machdep.c
==============================================================================
--- stable/8/sys/sparc64/sparc64/ata_machdep.c Sun Jan 29 12:52:34 2012
(r230734)
+++ stable/8/sys/sparc64/sparc64/ata_machdep.c Sun Jan 29 12:52:36 2012
(r230735)
@@ -36,14 +36,13 @@ sparc64_ata_disk_firmware_geom_adjust(st
{
/*
- * The Sun disk label only uses 16-bit fields for cylinders,
- * heads and sectors so the geometry of large IDE disks has
- * to be adjusted. If the disk is > 32GB at 16 heads and 63
- * sectors, the sectors have to be adjusted to 255. If the
- * the disk is even > 128GB, additionally adjust the heads
- * to 255.
- * XXX the OpenSolaris dad(7D) driver limits the mediasize
- * to 128GB.
+ * The VTOC8 disk label only uses 16-bit fields for cylinders, heads
+ * and sectors so the geometry of large disks has to be adjusted.
+ * If the disk is > 32GB at 16 heads and 63 sectors, adjust to 255
+ * sectors (this matches what the OpenSolaris dad(7D) driver does).
+ * If the the disk is even > 128GB, additionally adjust the heads to
+ * 255. This allows disks up to the 2TB limit of the extended VTOC8.
+ * XXX the OpenSolaris dad(7D) driver limits the mediasize to 128GB.
*/
if (disk->d_mediasize > (off_t)65535 * 16 * 63 * disk->d_sectorsize)
disk->d_fwsectors = 255;
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