On 7/27/05, Molle Bestefich <molle.bestefich@xxxxxxxxx> wrote:
> I have a patch for GRUB that allows it to install correctly on dmraid
> devices, if anyone's interested.
Here, it fixes a bug in grub 0.96 when you have a primary partition
larger than ~ 2.4 GB and also one or more extended partitions and want
to use the GRUB shell to install GRUB on a device mapper (dmraid)
device.
Not sure if it applies to 0.97 cleanly - you tell me :-).
Beware of using GRUB with HPT controllers - there's a risk of
destroying your array if you don't know what you're doing.
If you can't get GRUB to work, there's always the possibility of
creating a GRUB boot floppy.
The boot floppy will access your ATARAID devices through your RAID
card's BIOS, and will therefore see the correct devices...
diff -aur grub-0.96-orig/lib/device.c grub-0.96/lib/device.c
--- grub-0.96-orig/lib/device.c 2005-03-21 15:07:17.394333000 +0100
+++ grub-0.96/lib/device.c 2005-03-21 15:47:56.695502856 +0100
@@ -147,6 +147,8 @@
/* XXX This is the default size. */
geom->sector_size = SECTOR_SIZE;
+ /* Use 0 to test later on if sector value has already been correctly retrieved. */
+ geom->total_sectors = 0;
#if defined(__linux__)
/* Linux */
@@ -154,17 +156,16 @@
struct hd_geometry hdg;
unsigned long nr;
+ if (! ioctl (fd, BLKGETSIZE, &nr))
+ geom->total_sectors = nr;
+
if (ioctl (fd, HDIO_GETGEO, &hdg))
goto fail;
- if (ioctl (fd, BLKGETSIZE, &nr))
- goto fail;
-
/* Got the geometry, so save it. */
geom->cylinders = hdg.cylinders;
geom->heads = hdg.heads;
geom->sectors = hdg.sectors;
- geom->total_sectors = nr;
goto success;
}
@@ -236,9 +237,17 @@
given a proper st_blocks size. */
if (drive & 0x80)
{
+ /* If a total sector count has been found and it exceeds CHS capacities,
+ * use large drive placeholder values. */
+ if (geom->total_sectors && (geom->total_sectors >= 255*63*1024)) {
+ geom->cylinders = 1024;
+ geom->heads = 255;
+ geom->sectors = 63;
+ } else {
geom->cylinders = DEFAULT_HD_CYLINDERS;
geom->heads = DEFAULT_HD_HEADS;
geom->sectors = DEFAULT_HD_SECTORS;
+ }
}
else
{
@@ -247,11 +256,13 @@
geom->sectors = DEFAULT_FD_SECTORS;
}
- /* Set the total sectors properly, if we can. */
+ /* If total sectors hasn't been set yet, try and get a proper value. */
+ if (! geom->total_sectors) {
if (! fstat (fd, &st) && st.st_blocks)
geom->total_sectors = st.st_blocks;
else
geom->total_sectors = geom->cylinders * geom->heads * geom->sectors;
+ }
}
success:
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