Public bug reported:
Binary package hint: grub
Grub fails to set root (and thus boot) to a partition whose start
cylinder is greater than 133674 because the source code erroneously uses
a 32-bit signed "int" to hold an unsigned long which is greater than
2^31.
I have a new 1.5Tb hard drive with a CHS geometry of 182401/255/63. The
drive reports a total sector count of 2930277168. I have naively
partitioned the drive with two partitions beyond the 133674 cylinder
boundary from which I would like to be able to boot. The partition with
/boot on it is at the start of the drive.
The geometry struct defined in stage2/shared.h uses an unsigned long to
hold this value which is fine, but in many functions (such as rawread in
stage2/disk_io.c) the value is passed as an integer which results in a
negative value.
You can see the problem clearly in a grub shell by typing "root (hd0,4)"
(where /dev/sda5 is beyond the 133674 boundary) which results in "Error
18: Selected cylinder exceeds maximum supported by BIOS".
This was observed on an Intrepid 8.10, Intel 64 bit platform with
grub-0.97-29ubuntu45 installed. A review of the source code for Jaunty
grub-0.97-29ubuntu48 suggests that the problem remains unresolved.
I am aware that active development of grub legacy has been discontinued,
but I don't believe grub2 to be polished enough to replace it yet so it
would be nice to see a patch for this problem.
** Affects: grub (Ubuntu)
Importance: Undecided
Status: New
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cannot set root to partition with cylinder count greater than 133674
https://bugs.launchpad.net/bugs/325090
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