Date: Thu, 05 Sep 1996 10:00:25 -0400 From: Gary Chrysler <tcg@ime.net> To: shadows@kuwait.net Cc: freebsd-questions@FreeBSD.org Subject: Re: 2.1.5-RELEASE installation question Message-ID: <322EDCF9.2345@ime.net> References: <Pine.NEB.3.94.960905081634.16588C-100000@broken.whitefang.com>
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The ShadowS Know wrote: > > On Wed, 4 Sep 1996, Gary Chrysler wrote: > > > Paul T. Root wrote: > > > > For EIDE drives, the root partition *MUST* be completely contained within > > > the first 504Meg of the drive, due to the PC architectures BIOS limitations. > > > > > > > That applies to all IDE bootable devices, Not just EIDE. > > Well I installed 2.1.5 on an EIDE and even though it does start in the > first 504 megs its not *completely* contained in it. Is this causing some > problem I'm not aware of? I've only experienced it bieng slow, and I > figured its like that since there is no EIDE driver (or so the kernel > LINT config file said). > The importance is that the bootable partition be fully inside the first 1024 cylinders (~504M), The rest dosn't matter. In FreeBSD's case this is the / slice! (root slice) The Limit: Is in the Systems BIOS INT 13 functions 16 bit registers. DX - 8 bits for head number. 8 bits for drive number. CX - 10 bits for cylinder number. 6 bits for sector number. The largest 10 bit number possible is 1023, Thus the limit on numbers of cylinders is 1024. (0-1023) What fries me is, DX allows 255 drives. -Enjoy Gary ~~~~~~~~~~~~~~~~ Improve America's Knowledge... Share yours The Borg... Where minds meet (207) 929-3848
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