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 5A9C4EF99FF for ; Sat, 14 Feb 2026 06:22:24 +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: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:In-Reply-To:References: List-Owner; bh=bhqJ3Zbd93x6q73ne2WM4iciH+yEmBW8rgy5arB/wAI=; b=JB3biybdyED4RD rgslRqZPtME47IM/4VqeDDebIsE5V+2MePCNa8z55oLVWyfffCb+oXuOyvOxuWc25drmlNHbvKHFF VOnguVJD4R3XDZHYD+3ItOC7aAWfJDauvTZTrG7mdFLxjqoGj8O09NFu5HLbLM2iYb++ULrcuDZwx jFgH2zLUN/TgP+R6MhZNpxqMcR5yXz1HXyGnocd68s5Z2OmgCnoGkhgHQActEkBpwCojIZN+UShJz MtyUcR5ZJkxKNxAqZge88muqM32tYuDHgTvZz57AVIh/n0B8zU5IF5I0gsl9xs9raniF9yHYxIXxS YqPbd8YnY5XasNvSR+7w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vr92m-00000004KiW-42YU; Sat, 14 Feb 2026 06:22:16 +0000 Received: from mail.unwrap.rs ([172.232.15.166]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vr92k-00000004Ki7-3d45 for linux-mtd@lists.infradead.org; Sat, 14 Feb 2026 06:22:16 +0000 From: Cole Leavitt To: Tudor Ambarus , Pratyush Yadav , Michael Walle Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Cole Leavitt Subject: [PATCH] mtd: spi-nor: add support for Fudan Microelectronics FM25Q256 Date: Fri, 13 Feb 2026 23:20:02 -0700 Message-ID: <20260214062002.17862-1-cole@unwrap.rs> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260213_222214_980314_3493316B X-CRM114-Status: GOOD ( 13.36 ) 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 Add support for the Fudan Microelectronics FM25Q256 (JEDEC ID f7 f0 30), a 256Mbit (32MB) SPI NOR flash chip. This chip is found on Lenovo ThinkPad P16 Gen 3 (Arrow Lake-S) platforms as the SPI flash backing the UEFI firmware. The chip supports 4K sector erase, dual read, and quad read modes. Without this patch, the kernel's spi-nor driver reports: spi-nor spi0.0: unrecognized JEDEC id bytes: f7 f0 30 and refuses to create an MTD device, preventing userspace tools from accessing the flash. Signed-off-by: Cole Leavitt --- drivers/mtd/spi-nor/Makefile | 1 + drivers/mtd/spi-nor/core.c | 1 + drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/fudan.c | 25 +++++++++++++++++++++++++ 4 files changed, 28 insertions(+) create mode 100644 drivers/mtd/spi-nor/fudan.c diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index 5dd9c35f6b6f..2c8b9b3e08bb 100644 --- a/drivers/mtd/spi-nor/Makefile +++ b/drivers/mtd/spi-nor/Makefile @@ -5,6 +5,7 @@ spi-nor-objs += atmel.o spi-nor-objs += eon.o spi-nor-objs += esmt.o spi-nor-objs += everspin.o +spi-nor-objs += fudan.o spi-nor-objs += gigadevice.o spi-nor-objs += intel.o spi-nor-objs += issi.o diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index d3f8a78efd3b..395ff5c39883 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -1944,6 +1944,7 @@ static const struct spi_nor_manufacturer *manufacturers[] = { &spi_nor_eon, &spi_nor_esmt, &spi_nor_everspin, + &spi_nor_fudan, &spi_nor_gigadevice, &spi_nor_intel, &spi_nor_issi, diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index 16b382d4f04f..be63273677c8 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -594,6 +594,7 @@ extern const struct spi_nor_manufacturer spi_nor_atmel; extern const struct spi_nor_manufacturer spi_nor_eon; extern const struct spi_nor_manufacturer spi_nor_esmt; extern const struct spi_nor_manufacturer spi_nor_everspin; +extern const struct spi_nor_manufacturer spi_nor_fudan; extern const struct spi_nor_manufacturer spi_nor_gigadevice; extern const struct spi_nor_manufacturer spi_nor_intel; extern const struct spi_nor_manufacturer spi_nor_issi; diff --git a/drivers/mtd/spi-nor/fudan.c b/drivers/mtd/spi-nor/fudan.c new file mode 100644 index 000000000000..e9a4d3ed3cd0 --- /dev/null +++ b/drivers/mtd/spi-nor/fudan.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Fudan Microelectronics SPI NOR flash support. + * + * JEDEC manufacturer ID 0xf7. + */ + +#include + +#include "core.h" + +static const struct flash_info fudan_nor_parts[] = { + { + .id = SNOR_ID(0xf7, 0xf0, 0x30), + .name = "fm25q256", + .size = SZ_32M, + .no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ, + }, +}; + +const struct spi_nor_manufacturer spi_nor_fudan = { + .name = "fudan", + .parts = fudan_nor_parts, + .nparts = ARRAY_SIZE(fudan_nor_parts), +}; base-commit: 2687c848e57820651b9f69d30c4710f4219f7dbf -- 2.52.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/