From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from hauke-m.de ([5.39.93.123]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YyN6C-0007g8-8z for linux-mtd@lists.infradead.org; Fri, 29 May 2015 16:25:32 +0000 Message-ID: <556892B8.3020706@hauke-m.de> Date: Fri, 29 May 2015 18:24:24 +0200 From: Hauke Mehrtens MIME-Version: 1.0 To: Ray Jui , Brian Norris , linux-mtd@lists.infradead.org, bcm-kernel-feedback-list@broadcom.com, =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= Subject: Re: iProc nand iproc-idm register References: <5562078A.6030909@hauke-m.de> <55635511.30602@broadcom.com> In-Reply-To: <55635511.30602@broadcom.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 05/25/2015 07:00 PM, Ray Jui wrote: > Hi Hauke, > > On 5/24/2015 10:16 AM, Hauke Mehrtens wrote: >> Hi Ray, >> >> in the iproc_nand driver your are using this register range: >> reg = <0x18046000 0x600>, <0xf8105408 0x600>, <0x18046f00 0x20>; >> reg-names = "nand", "iproc-idm", "iproc-ext"; >> >> I think the iproc-idm register range is the wrap address part on bcma >> bus. On the bcma bus it is 0x1000 in size and 0x0408 is the offset of >> the IO control register in it. Are the new iProc devices different here >> or is this register not always at this offset but varies? > > It's different. Based on the Cygnus RDB, there's nothing between > 0xf8105000 and 0xf8105404. Thanks for the info, the space before 408 is not used on the older chips, just some addresses ontop of that. Still this is a strange address to start a register map. > >> >> Wouldn't it be better to specify the complete range like this: >> reg = <0x18046000 0x600>, <0xf8105000 0x1000>, <0x18046f00 0x20>; >> Then you can read the register at offset 0x408 in that range. >> >> Hauke >>