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Date:      Mon, 23 Sep 2002 12:19:50 -0000
From:      Sten Poldma <exile@chamber.ee>
To:        freebsd-firewire@freebsd.org
Subject:   28bit address limitation on HD
Message-ID:  <20020923141950.re5k5m1g9s00o@.chamber.ee>

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Hi,

I'm Sorry if the following is not firewire related but depends on other system
components instead.

I'm using the newest firewire driver
(http://people.freebsd.org/~simokawa/firewire-20020918.tar.gz)

To test a 160GB IDE drive (in a box), through the CAM and passthrough drivers I
have no problem locating the device (da0) but the geometry of the drive found
makes me believe that there is a 28bit addressing mode bottleneck somewhere as
the log reports that 268435455 512 byte sectors found. (~131GB) (I believe
268435456 being the 28bit limit?)

Although using it is OK I'm still wondering if it would be possible to locate
the missing 20GB before the disk actually goes into active use.

I'd like to know what is causing this limitation?

From the hardware I have:

FreeBSD 4.4 -> make buildworld to 4.6.2, latest
kernel: 4.7-RC FreeBSD 4.7-RC #0: Sun Sep 22 01:39:47 EET 2002
Firewire PCI card: fwohci0: <Texas Instruments TSB12LV26>
and a Western Digital 160GB drive in a standard firewire box.

Again, accept my apologies if this is the wrong place to request
help\clarification on the matter but any help or hint is appreciated.

Have a nice day,

Sten

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