Date: Sat, 27 Jun 2009 16:44:06 +0200 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Alexander Motin <mav@FreeBSD.org> Cc: FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: RFC: ATA to CAM integration patch Message-ID: <20090627164406.155f002d@ernst.jennejohn.org> In-Reply-To: <4A4517BE.9040504@FreeBSD.org> References: <4A4517BE.9040504@FreeBSD.org>
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On Fri, 26 Jun 2009 21:47:26 +0300 Alexander Motin <mav@FreeBSD.org> wrote: > Hi. > > I would like to present for testing and feedback present state of my and > Scott work on extending CAM subsystem to support ATA in addition to > SCSI. At this moment we have: > - CAM transport separated on common and SCSI-specific parts, last one > wrapped with small API that allows switching; > - implemented SATA-specific transport, that is automatically used when > controller reports SATA bus attached to it. It supports both single > drive and Port Multiplier modes. The only parts unfinished yet is the > automatic hot-plug (you have to do reset/rescan manually) and heavy > errors recovery; > - implemented ATA disk driver for CAM infrastructure to natively > operate ATA disks. It already supports most of required functionality: > identify, read, write, flush, dump, NCQ; > - ATAPI devices handled natively by existing SCSI peripherals drivers, > by tunneling SCSI commands over ATA bus by PACKET ATA extension; > - implemented AHCI controller driver, supporting most of tasty > hardware features (controller command queuing, NCQ, Port Multiplier, > MSI). Only some features from latest AHCI specifications for which I > have no hardware left unimplemented. > - camcontrol took minor changes to be able to report ATA devices. > > To test our work you should: > - have any AHCI compatible controller configured to native AHCI mode > (not a COMPATIBLE or RAID or whatever else) by BIOS; > - have some Serial ATA/ATAPI drives connected to AHCI controller; > - patch your recently updated 8-CURRENT with this patch: > http://people.freebsd.org/~mav/cam-ata.20090626.patch - remove atapicam from you kernel config file, otherwise the kernel pancis in xpt (at least, mine did) > - rebuild and install world and kernel; > - read new ahci man page; > - make sure that you will be able to boot if your SATA disk devices > name change from some ad4 to ada0; > - load ahci kernel module using loader prompt or loader.conf; > - boot. --- Gary Jennejohn
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