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Subject2.6 kernels misdetect harddisk geometry, 2.4 kernels are fine
Hi,

the harddisk geometry recognized by 2.6 kernels differs from the geometry
recognized by 2.4 kernels. The 2.4 kernel version agrees with the BIOS and
fdisk/parted. The 2.6 kernel version seems senseless to me. Here is a diff
between bootup messages: (more info available if you need it)

--- /var/log/boot.msg24 2004-04-01 10:33:23.000000000 +0200
+++ /var/log/boot.msg26 2004-04-01 10:34:48.751069936 +0200
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
RAMDISK driver initialized: 16 RAM disks of 64000K size 1024 blocksize
loop: loaded (max 16 devices)
-Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
+Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
-VP_IDE: IDE controller at PCI slot 00:07.1
+VP_IDE: IDE controller at PCI slot 0000:00:07.1
VP_IDE: chipset revision 6
VP_IDE: not 100%% native mode: will probe irqs later
-ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
-VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
+VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci0000:00:07.1
ide0: BM-DMA at 0xa400-0xa407, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xa408-0xa40f, BIOS settings: hdc:DMA, hdd:pio
hda: IBM-DTLA-307030, ATA DISK drive
-blk: queue c03e66c0, I/O limit 4095Mb (mask 0xffffffff)
-hdc: TOSHIBA DVD-ROM SD-M1402, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
+hdc: TOSHIBA DVD-ROM SD-M1402, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
-hda: attached ide-disk driver.
-hda: host protected area => 1
-hda: 60036480 sectors (30739 MB) w/1916KiB Cache, CHS=3737/255/63, UDMA(100)
-ide-floppy driver 0.99.newide
-Partition check:
+hda: max request size: 128KiB
+hda: 60036480 sectors (30738 MB) w/1916KiB Cache, CHS=59560/16/63, UDMA(100)
hda: hda1 hda2 hda3
ide-floppy driver 0.99.newide


Especially interesting are the lines:
-hda: 60036480 sectors (30739 MB) w/1916KiB Cache, CHS=3737/255/63, UDMA(100)
+hda: 60036480 sectors (30738 MB) w/1916KiB Cache, CHS=59560/16/63, UDMA(100)

You can see that both share the same sector count, but differing Megabytes
and differing CHS. This breaks nearly every partitioning program I know
and it makes supporting old ATARAID configurations a nightmare. (Some of
the RAID superblock locations depend on the BIOS idea of CHS.)

Is this change intentional or a bug?


Regards,
Carl-Daniel
--
http://www.hailfinger.org/

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