Messages in this thread |  | | Date | Fri, 30 Mar 2001 06:58:52 -0800 (PST) | From | Andre Hedrick <> | Subject | Re: Bug in EZ-Drive remapping code (ide.c) |
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Jochen,
I don't really care about Disk Overlays. However if you can fix it or if Andries can great.
Sorry,
On Fri, 30 Mar 2001, Jochen Hoenicke wrote:
> Hello, > > The EZ-Drive remapping code remaps to many sectors, if they are read > together with sector 0 in one bunch. This is even documented: > > >From linux-2.4.0/drivers/ide/ide.c line 1165: > /* Yecch - this will shift the entire interval, > possibly killing some innocent following sector */ > > This problem hit a GRUB user using linux-2.4.2 but it exists for a > long time; the remapping code is already in 2.0.xx. The reason that > nobody cares is probably because there are only a few programs that > access /dev/hda directly. > > GRUB is a boot loader that normally runs under plain BIOS but there is > also a wrapper to run it under linux and other unixes. Because it > shares most code with its BIOS derivate it accesses the disk the hard > way, reading directly from /dev/hda and interpreting the file system > with its own (read-only) file system drivers. > > This is what happened: Grub reads the first track in one bunch and > since a track has an odd number of sectors, linux adds the first > sector of the next track to this bunch. This sector contains the boot > sector of the first FAT partition. The result of the remapping is > that grub can't access that partition. > > Please CC me on reply. > > Jochen >
Andre Hedrick Linux ATA Development
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