From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 04 Feb 2026 21:02:13 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vnj4n-008rmt-2F for lore@lore.pengutronix.de; Wed, 04 Feb 2026 21:02:13 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1vnj4k-0005te-AS for lore@pengutronix.de; Wed, 04 Feb 2026 21:02:13 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=bvOOycgPLfa/uh6WfCn9NeOhuSHKNbIehm8lECm4JIA=; b=Wx+G/Dt3lz0VU+c+NmO1QreY8i p4VPMcC5uPsqPo6T6LQ45wcPLWOvo8Z3laa8YZ4Pr8mr18FU8rgrv7PVFbUKiY2xUFIzBa7CIbo5T F/CNmq4cbUDNVVwT+ROUd5bhMJaFI25LneYTiIAQhT7d34dlLwZpVknSUxzlR1BwmdQnyYWtHYo7O SHbGUgBkfrpQR4GcVyOM1zOldtLpjDXp5j6dXWMtW8q28glQ9Qs8QTyoOyWO8aF4+6SgHdbloFHT6 EEUDXq+8jlsHEVnN62jbwJ8sKzYOnFr5tVpUCv/PxE8MEl8zqImaEdvrl/XqhI9djNFl2L9FHExkP 5rXYOHAw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vnj4A-0000000914b-03kR; Wed, 04 Feb 2026 20:01:34 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vnj42-000000090yt-3rtN for barebox@lists.infradead.org; Wed, 04 Feb 2026 20:01:30 +0000 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1vnj40-0005Eh-Sp; Wed, 04 Feb 2026 21:01:24 +0100 From: Marco Felsch Date: Wed, 04 Feb 2026 21:01:22 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260204-v2025-09-0-topic-optee-of-handling-v2-6-da075e6818e0@pengutronix.de> References: <20260204-v2025-09-0-topic-optee-of-handling-v2-0-da075e6818e0@pengutronix.de> In-Reply-To: <20260204-v2025-09-0-topic-optee-of-handling-v2-0-da075e6818e0@pengutronix.de> To: Sascha Hauer , BAREBOX Cc: Marco Felsch X-Mailer: b4 0.14.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260204_120126_997142_8DF8DF1E X-CRM114-Status: GOOD ( 14.68 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 06/15] ARM: i.MX: scratch: add FDT support X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) Add support to store a FDT within the scratch area. The user needs to query the location and size via imx_scratch_get_fdt() which can be used afterwards to write the actual FDT into it. Signed-off-by: Marco Felsch --- arch/arm/mach-imx/scratch.c | 24 ++++++++++++++++++++++++ common/Kconfig | 14 ++++++++++++++ include/mach/imx/scratch.h | 2 ++ 3 files changed, 40 insertions(+) diff --git a/arch/arm/mach-imx/scratch.c b/arch/arm/mach-imx/scratch.c index e4e2d25969f061c9fcdfd7c3d87701b715eb2805..da138445dfb352f2f3497be77004aefc7d46f188 100644 --- a/arch/arm/mach-imx/scratch.c +++ b/arch/arm/mach-imx/scratch.c @@ -16,7 +16,10 @@ struct imx_scratch_space { u32 bootrom_log[128]; u32 reserved[128]; /* reserve for bootrom log */ struct optee_header optee_hdr; + /* FDT needs an 8 byte alignment */ + u8 fdt[CONFIG_SCRATCH_FDT_SIZE] __aligned(8); }; +static_assert(sizeof(struct imx_scratch_space) <= CONFIG_SCRATCH_SIZE); static struct imx_scratch_space *scratch; @@ -92,3 +95,24 @@ const struct optee_header *imx_scratch_get_optee_hdr(void) return &scratch->optee_hdr; } + +u8 *imx_scratch_get_fdt(unsigned int *fdt_sz) +{ + unsigned int sz; + + if (!scratch) { + if (IN_PBL) + return ERR_PTR(-EINVAL); + else + scratch = (void *)arm_mem_scratch_get(); + } + + sz = sizeof(scratch->fdt); + if (sz == 0) + return NULL; + + if (fdt_sz) + *fdt_sz = sz; + + return scratch->fdt; +} diff --git a/common/Kconfig b/common/Kconfig index 50c26695b2b56a943edfd00a7e0cb1067ad269a9..265652900a5632177d36efa84d590be6db2e7015 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -304,6 +304,20 @@ config SCRATCH_SIZE default 0x8000 prompt "Scratch size" +config SCRATCH_FDT_SIZE + hex + default 0x0 + prompt "Scratch FDT size" + help + The size of the scratch area used as destination to load and optional + decompress the barebox builtin DTB into it. Can be 0x0 if early FDT + support is not requied. + + If specified, SCRATCH_FDT_SIZE <= SCRATCH_SIZE must be ensured. + + This option should match the OP-TEE's CFG_DTB_MAX_SIZE configuration + if used by OP-TEE. + config MALLOC_ALIGNMENT hex default 8 diff --git a/include/mach/imx/scratch.h b/include/mach/imx/scratch.h index 6c2cecabcd80f71aa754736322151d63f2711745..b74d19a560f33da0a11621af7e11abdce6d1c295 100644 --- a/include/mach/imx/scratch.h +++ b/include/mach/imx/scratch.h @@ -14,6 +14,8 @@ struct optee_header; const struct optee_header *imx_scratch_get_optee_hdr(void); void imx_scratch_save_optee_hdr(const struct optee_header *hdr); +u8 *imx_scratch_get_fdt(unsigned int *fdt_sz); + #define imx8mq_init_scratch_space() imx8m_init_scratch_space(32, true) #define imx8mm_init_scratch_space() imx8m_init_scratch_space(32, true) #define imx8mn_init_scratch_space() imx8m_init_scratch_space(16, true) -- 2.47.3