From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8983BC43327 for ; Wed, 1 Jul 2026 09:49:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=psJer32KaTB6+df5bmROgec3Ixucqq5p+YFo4ShJ76g=; b=PGBqqUjJ2XeAHk iya/YHGmZKhQ6vbYDeucD17wY2FSzUIxpnhYOO95cvqV5udGEP3yCGWTwU30HOXrzX/EtkdohwIXC MkhTRlmRTZOyeSoESF/64k/YLbK+82S0Ju0gf2Te20WF4ziwswKJ4sck4zRaZxBZiAxJ7Z5bwRvj8 ZCAT2KvDZVDbO+LM/Y83ngPncNfnNMUFz0W7TgUR48Cfqx6FxazCbIxE9O+Z63YbuTtDHn4mXzeEp ITpdxY4wj2sCRbfyI7NKokHbMHPfdhX8gc0mHpQn6UeXBT23c98jc0o5siZ8yzKN6iZjna7OPSdma tAUgMo9kjRNq4zvRFdGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1werZF-00000001Ehj-25No; Wed, 01 Jul 2026 09:49:17 +0000 Received: from smtp2.infineon.com ([2a00:18f0:1e00:4::4]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1werZB-00000001Efe-4ACJ for linux-mtd@lists.infradead.org; Wed, 01 Jul 2026 09:49:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=infineon.com; i=@infineon.com; q=dns/txt; s=IFXMAIL; t=1782899354; x=1814435354; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=bikzSr+NRQS0BStBxaDankRVM0j6fnovMuiAylead9M=; b=Jmlr5Fqu8rdcbidjSo7vrlmqlB9bJir9/xUzLCYOeIDZwjnY5cO/J401 QRbivVJ9Vufm5Xa0nyJU0XhnBr7QJFPEXbs8tvOKL8Y+tyBwQ4mzKB3oP q2UXYqmWkMY0UUvGTy70E3IDM+GVMRY3RDHoSsjK/ibTt+Sc4sJKUTZgh c=; X-CSE-ConnectionGUID: g2aqPEuVQAeQXqvBZU2m+Q== X-CSE-MsgGUID: Sef72jcpQhG0MzYbXN0sVA== X-IronPort-AV: E=McAfee;i="6800,10657,11833"; a="165441956" X-IronPort-AV: E=Sophos;i="6.24,235,1774306800"; d="scan'208";a="165441956" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO MUCSE822.infineon.com) ([172.23.29.53]) by smtp2.infineon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2026 11:49:08 +0200 Received: from MUCSE816.infineon.com (172.23.29.42) by MUCSE822.infineon.com (172.23.29.53) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.43; Wed, 1 Jul 2026 11:49:07 +0200 Received: from MUCSE815.infineon.com (172.23.29.41) by MUCSE816.infineon.com (172.23.29.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.43; Wed, 1 Jul 2026 11:49:07 +0200 Received: from MUCSE815.infineon.com ([fe80::b54c:c0bd:546c:c9be]) by MUCSE815.infineon.com ([fe80::b54c:c0bd:546c:c9be%12]) with mapi id 15.02.2562.043; Wed, 1 Jul 2026 11:49:07 +0200 From: To: CC: , , , , , , , , Subject: RE: [PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support" Thread-Topic: [PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support" Thread-Index: AQHdBRKBdcAN9mfv+k6bdaeZDwvjfLZWt11QgADFb4CAAFitgP//+/8AgACbEMA= Date: Wed, 1 Jul 2026 09:49:07 +0000 Message-ID: <490fc98b2996487fba3abd62176bb1dd@infineon.com> References: <2b8390c0aaae4203af318f9a5edbb0eb@infineon.com> <20260701020856.217664-1-ronan.dalton@alliedtelesis.co.nz> In-Reply-To: <20260701020856.217664-1-ronan.dalton@alliedtelesis.co.nz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.161.6.196] MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260701_024914_411872_519F27F0 X-CRM114-Status: GOOD ( 23.39 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Hi Ronan, > Hi Takahiro, > > > We don't add any FRAM chips in SPI-NOR... > > The SPI-NOR subsystem has support for the cy15x104q chips, which are > FRAM chips. There is also support for Everspin MRAM chips, which are > comparible to FRAM (and are also of small size). > > Because of this, we thought there was precident to add support for this > chip. I was under the impression that the opcodes used to interact with > the chip had a greater significance than the underlying technology used, > and this chip fits in with the other spi-nor chips based on that. Feel > free to correct me if I'm wrong here. > > > > The use is for a small amount of additional storage separate to the main > > > system NAND flash for some small "critical" files that we don't want to > > > lose. We've been using devices like the mchp23lcv1024 and mr25h40 on > > > other products for some time. > > > > > For that use, how about using tmpfs with NVMEM backup? > > Could you elaborate on this? I'm familiar with tmpfs but not with using > NVMEM as a backup for it. Is there some method of syncing a tmpfs to > NVMEM that the kernel provides? > I didn't mean any kernel features, but we can dump tmpfs contents from/to FRAM chip (exposed as NVMEM device) by 'dd'. Doesn't it meet your system's requirement? > Thanks, > Ronan. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/