Date: Fri, 23 May 2008 17:44:16 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@freebsd.org> To: Julian Stacey <jhs@berklix.org> Cc: phoemix@harmless.hu, freebsd-current@freebsd.org Subject: Re: ata mode at startup Message-ID: <A289B32D-AA0C-4EB9-9E63-7587ED33E82E@freebsd.org> In-Reply-To: <200805231443.m4NEhGTM090324@fire.js.berklix.net> References: <200805231443.m4NEhGTM090324@fire.js.berklix.net>
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On 23May, 2008, at 16:43 , Julian Stacey wrote: > phoemix@harmless.hu wrote: >> Hello, >> As known, FreeBSD sets the highest supported ATA mode, but =20 >> sometimes it's >> inproper, since the disk fails to work in this mode. This will be =20 >> obsolate =3D >> by >> recent SATA drives, but PATA is still in use :) >> I've though of the possibility of adding an "atamodetab" rc script, =20= >> with wh=3D >> ich >> the administrator could specify the disk modes to set on startup. > ......^^^^^^^^^^^^^ .... > > No good waiting for an admin to manually edit a table: > An admin cant edit till FreeBSD boots. > FreeBSD fails to boot on some older laptops eg > http://www.berklix.com/~jhs/hardware/digital/ > http://www.berklix.com/~jhs/hardware/laptops/=20 > dell_latitude_xpi_p133st/ > unless one pre-knows FreeBSD magic like =09 > loader.conf hw.ata.ata_dma=3D0 > http://www.berklix.com/~jhs/hardware/laptops/#loader.conf > > A table in src/ that would automatically recognise flakey ATA hardware > & reduce ambitious FreeBSD so it could boot, would be nice. It would also be impossible to maintain, thats why the current knobs =20 are there, if DMA fails you boot in "safe" mode ie PIO and then you =20 can experiment to your hearts content what your flakey HW can take. -S=F8ren=
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