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Date:      Mon, 26 Jan 2004 07:45:49 -0800 (PST)
From:      Hirokazu WATANABE <wnabe@par.odn.ne.jp>
To:        freebsd-gnats-submit@FreeBSD.org
Subject:   kern/61960: [Patch] BigDrive support for PC-98 architecture (ata(4) driver)
Message-ID:  <200401261545.i0QFjnRP075973@www.freebsd.org>
Resent-Message-ID: <200401261620.i0QGK6Zo014802@freefall.freebsd.org>

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>Number:         61960
>Category:       kern
>Synopsis:       [Patch] BigDrive support for PC-98 architecture (ata(4) driver)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 26 08:20:06 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Hirokazu WATANABE
>Release:        FreeBSD/pc98 5.2-RELEASE
>Organization:
>Environment:
FreeBSD hebe.fb98.dyndns.org 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Sun Jan 25 14:06:12 JST 2004 watanabe@proteus.fb98.dyndns.org:/usr/src/sys/pc98/compile/GENERIC  i386

>Description:
PC-98's slice table managed by CHS geometry. And the ata(4) driver is 
using the head/sector value acquired from HDD. However, in 32GB or more 
of HDD, since a cylinder value overflows, it cannot be used normally.
(Some interfaces for PC-98x1 works over 8GB HDDs. But there are still 
manages in CHS geometry.)

PC-98's slice table max values are followd(maybe)...
Cylinder: 65534(=65535)
Heads:    255(=256)
Sectors:  255

Typical PC-98's geometry:
under 4.3GB:                    heads=8,   sectors=17
4.3GB to 32GB:                  heads=16,  sectors=63(=HDD's geometry)
32GB to 128GB:                  heads=16,  sectors=255(*1)
128GB to 2TB:                   heads=255, sectors=255(*2,*3,*4)
over 2TB:      cylinders=65534, heads=255, sectors=255(*2,*3)

(*1) PK98-Mistress9[atacbus's add-on BIOS] and UIDE-133/98(PCI-ATA) only
(*2) UIDE-133/98 only
(*3) PK98-Mistress9 is cylinders=65534, heads=16, sectors=255
(*4) over 128GB or supports 48bit LBA

>How-To-Repeat:
FreeBSD/pc98 5.2-RELEASE installed, and use fdisk_pc98(8) for 
over-32GB-HDD. Then, fdisk_pc98 cannot handle its geometry.
This is because cylinder of HDD is over 16bit.

>Fix:
ata(4) use BIOS geometry, or it changes not with the value acquired from HDDs but with the fixed value(heads/sectors). 

A patch which solves this problem is appended to below.
(http://fb98.dyndns.org/FreeBSD/bignadrive-20040126.diff.gz)

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5"!]4^7T:NWJL4*#]_T4X_!BY&```
`
end

>Release-Note:
>Audit-Trail:
>Unformatted:



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