From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: Marvell 88SE9480 Port Multiplier Support Date: Sun, 08 Oct 2017 09:45:44 -0700 Message-ID: <1507481144.3150.4.camel@HansenPartnership.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Return-path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:52538 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751626AbdJHQpq (ORCPT ); Sun, 8 Oct 2017 12:45:46 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Andrew Ryder , linux-ide@vger.kernel.org On Sun, 2017-10-08 at 00:12 -0400, Andrew Ryder wrote: > Hello, > > Does the mvsas support port multiplier for the marvell 88SE9480 chip? Not at the present time.  The code to handle SATA port multipliers is stubbed out in libsas/sas_ata.c The reason is fairly simple: usually if you're connecting drives via a SAS host adapter, you want to use SAS expanders because they're way more featureful and performant than SATA port multipliers, so there's not much customer pull for support. > I purchased an Addonics http://addonics.com/products/ad2ms6gpx8-e.php > but the card fails to see any of the attached drives. > > I found an old message saying it might support sata pmp? > https://lkml.org/lkml/2014/4/24/413 This patch set was never merged.  There were significant problems with the EH portion, which Dan Williams reviewed and sent a load of feedback for but no future patch set incorporating the modifications was ever forthcoming. James > I've attached a dmesg output also and I'm running kernel 4.9.36 if > that > helps. > > Andrew