From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 26 Nov 2025 07:48:16 +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 1vO9K4-004zTf-1S for lore@lore.pengutronix.de; Wed, 26 Nov 2025 07:48:16 +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 1vO9K3-0003Pm-Q7 for lore@pengutronix.de; Wed, 26 Nov 2025 07:48:16 +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:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=s8CFaBmCvrp+JakwlzsKKURIz6VlZvtQLhebom2lXzc=; b=2Ydo0Tc3W1SyCF+yEN3vDy93mV 5Qiwa+tiSvfmIbJB93TABU2DgxulOvQCwmvtn1gmYT9CCh12Cq0/UO0Ll7VnjpXrAgEZ2wQSN2Kmj xzfiN69jpoY1lDsE+HtEwqjPmBwuHxqkq5XVF3F5GP3++jvaSRbcrLrZTjb003fdEiOzdyJDZ2f2H q97TM3wt/UhZ4qT9OCCli3vxN3yOerV70qhmbhFMUASBg37Sj32rul0l30UQ3LXp0xFfbyM9PFraR iIdfFA/p8A6QTaptAcVcvImQgfLa4Ubyiwy7sYeuG/qYlJ0P2zEwyCLGXOKtltnpgXyoMkQiw7tUz oSFUVDmQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vO9JX-0000000ESVJ-2yJC; Wed, 26 Nov 2025 06:47:43 +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 1vO9JS-0000000EST7-41sz for barebox@lists.infradead.org; Wed, 26 Nov 2025 06:47:41 +0000 Received: from dude06.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::5c]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1vO9JQ-0003Bf-ND; Wed, 26 Nov 2025 07:47:36 +0100 From: Fabian Pflug To: barebox@lists.infradead.org Cc: Fabian Pflug Date: Wed, 26 Nov 2025 07:42:19 +0100 Message-ID: <20251126064710.3721039-5-f.pflug@pengutronix.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251126064710.3721039-1-f.pflug@pengutronix.de> References: <29c84edc-9619-4524-a698-1edd3a60ac89@pengutronix.de> <20251126064710.3721039-1-f.pflug@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251125_224739_013461_0404EB22 X-CRM114-Status: GOOD ( 15.34 ) 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=-3.3 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 4/4] bootm: introduce bootm.root_arg variable 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) The bootm.root_arg variable will be responsible for the root= part of the kernel commandline if bootm.appendroot is set and a root device has been selected. root_arg allows to replace the root=/dev/... with verity=/dev/..., which is useful in a verified boot context, where you pass the root file system to the initramfs, but do not want the kernel to be able to parse and mount the rootfs. With renaming the root= to something different, you make sure, that the kernel does not mount the rootfs. Signed-off-by: Fabian Pflug --- common/bootm.c | 8 ++++++-- include/bootm.h | 1 + 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/common/bootm.c b/common/bootm.c index 5d7dc00e3e..a1aba06f0e 100644 --- a/common/bootm.c +++ b/common/bootm.c @@ -69,6 +69,7 @@ void bootm_data_init_defaults(struct bootm_data *data) data->initrd_file = getenv_nonempty("global.bootm.initrd"); } data->root_dev = getenv_nonempty("global.bootm.root_dev"); + data->root_arg = getenv_nonempty("global.bootm.root_arg"); data->verify = bootm_get_verify_mode(); data->appendroot = bootm_appendroot; data->provide_machine_id = bootm_provide_machine_id; @@ -88,6 +89,7 @@ void bootm_data_restore_defaults(const struct bootm_data *data) globalvar_set("bootm.initrd", data->initrd_file); } globalvar_set("bootm.root_dev", data->root_dev); + globalvar_set("bootm.root_arg", data->root_arg); bootm_set_verify_mode(data->verify); bootm_appendroot = data->appendroot; bootm_provide_machine_id = data->provide_machine_id; @@ -868,10 +870,10 @@ int bootm_boot(struct bootm_data *bootm_data) } else { char *rootarg; if(rootopts) { - rootarg = xasprintf("root=%s %s", root, rootopts); + rootarg = xasprintf("%s=%s %s", bootm_data->root_arg, root, rootopts); free(rootopts); } else { - rootarg = xasprintf("root=%s", root); + rootarg = xasprintf("%s=%s", bootm_data->root_arg, root); } free(root); pr_info("Adding \"%s\" to Kernel commandline\n", rootarg); @@ -1116,6 +1118,7 @@ static int bootm_init(void) globalvar_add_simple("bootm.image.loadaddr", NULL); globalvar_add_simple("bootm.oftree", NULL); globalvar_add_simple("bootm.root_dev", NULL); + globalvar_add_simple("bootm.root_arg", "root"); globalvar_add_simple("bootm.tee", NULL); globalvar_add_simple_bool("bootm.appendroot", &bootm_appendroot); globalvar_add_simple_bool("bootm.earlycon", &bootm_earlycon); @@ -1173,5 +1176,6 @@ BAREBOX_MAGICVAR(global.bootm.verbose, "bootm default verbosity level (0=quiet)" BAREBOX_MAGICVAR(global.bootm.earlycon, "Add earlycon option to Kernel for early log output"); BAREBOX_MAGICVAR(global.bootm.appendroot, "Add root= option to Kernel to mount rootfs from the device the Kernel comes from (default, device can be overridden via global.bootm.root_dev)"); BAREBOX_MAGICVAR(global.bootm.root_dev, "bootm default root device (overrides default device in global.bootm.appendroot)"); +BAREBOX_MAGICVAR(global.bootm.root_arg, "bootm default name arg for the root partition (normally 'root' for root=/dev/...)"); BAREBOX_MAGICVAR(global.bootm.provide_machine_id, "If true, append systemd.machine_id=$global.machine_id to Kernel command line"); BAREBOX_MAGICVAR(global.bootm.provide_hostname, "If true, append systemd.hostname=$global.hostname to Kernel command line"); diff --git a/include/bootm.h b/include/bootm.h index b35deb25bf..43f4258885 100644 --- a/include/bootm.h +++ b/include/bootm.h @@ -19,6 +19,7 @@ struct bootm_data { const char *oftree_file; const char *tee_file; const char *root_dev; + const char *root_arg; int verbose; enum bootm_verify verify; bool force; -- 2.47.3