From: Jim Brain (brain_at_jbrain.com)
Date: 2007-12-28 01:43:13
silverdr@inet.com.pl wrote:
>
>
>
> P.S. A different subject - I don't know why but it seems to me that
> nobody likes the idea of (re)using IDE64 partition scheme and
> filesystem.. I wonder why..?
We are defitely using the IDE64 Partition Scheme, as it uses the std IBM
IDE partition scheme.
If we implement the IDE64 FS, we should absolutely use partition type
0xcf (the one they use). Note, though, there might be issues using 0xcf
for other FS-types. For one, IDE64 will no doubt assume an 0xcf
partition type is IDEDOS FS, but if we overload that partition type with
other FS layouts (like Linux uses 0x83 for multiple FStypes - xiafs,
ext2, ext3, reiserfs, etc.), and someone tries to share a CF or IDE
drive between the two adapters, major issues and data lossage will
occur. The other issue (not nearly as problematic, but still) is that
0xcf is already a claimed partition type (0xcf is claimed by DR-DOS
Secure FAT FS). As far as I can tell, 0xf8 is not used by anyone.
As for the FS, I think it should be supported, but I don't know that it
should be the only one supported. I think FAT should be supported as
well, for folks who want to mount their CF and then pick it up and pop
it into their PC.
However, beyond the use of IDE partition tables, I can;t find a doc that
explains the FS layout. Without it, it will be very hard to implement.
Jim
--
Jim Brain, Brain Innovations (X)
brain@jbrain.com
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!
Home: http://www.jbrain.com
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