From nobody Tue Jan 25 03:16:58 2022 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 983FA19891AE for ; Tue, 25 Jan 2022 03:17:35 +0000 (UTC) (envelope-from embaudarm@gmail.com) Received: from mail-yb1-xb2b.google.com (mail-yb1-xb2b.google.com [IPv6:2607:f8b0:4864:20::b2b]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4JjX8t5NMwz3rhT for ; Tue, 25 Jan 2022 03:17:34 +0000 (UTC) (envelope-from embaudarm@gmail.com) Received: by mail-yb1-xb2b.google.com with SMTP id g81so57623884ybg.10 for ; Mon, 24 Jan 2022 19:17:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=OjX3Q6YP3qAP29N8R3goC6Ci+5hAl0z3MBBIeKCjq7U=; b=GcoBKtXnY+N3chCUBYaabVVLHNWT+B0zPhLToI2rE3I5pOEGhBtLTb4WDSAUlllUa/ tpS3Y07TSNiex2LNSpJVGKtwnesE1SKkpmp1+qzvf4U6JvUxOmMvPZ4QA5qUHrE3gQQC /oCmMdmaoZBc/4aoIySTzf8/P9s+vV3Xs+NTxHrJVXyZv0SQ/QG+2fnjsl7WZXgvPtuQ 3O/6uSVDh+lC66ORftP4OGxhRgC19bsmf0woaKhm9hPlNK66rfC1kKxUYQ/K3FJhAdv/ fBXy4fBl51d+Knc7yJQrIZe4l3UB+wLEnfnuZHifUai7gtbu/ntjBk4Vbvd6utodbt94 3woQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=OjX3Q6YP3qAP29N8R3goC6Ci+5hAl0z3MBBIeKCjq7U=; b=JFqZHS0vq7h4UDE0LiDp7qV8hfyDxb+s1X9LWYfZtka4f2OUp+237FUsvkX5w0rljT UKj9jHUHbkraqYWBclvQ831KfYO6QNMOl/jVuAPHaf89L254HtyvH3OkvyVOnuBu7zdd JocM41UYyVfYpg5cAr4aykwy+qtgq7nlUyrvkaC7cuUL3/TPaw/22WCGJojCPXJnov93 CQ4QMEk9G9HmdailFAoZdzcWmJE8MXu94BOCrXJWJl+PZcqSuQjUI/fO0Pj0yca1qdFR pt1t1ol6JDNVVO3frWT6KT+34505ThGCa2UoKnoxyluqnVwCTIT5FQKiIeM2TB363IDs Qn+w== X-Gm-Message-State: AOAM533tRNGy2L44i3s8XIoVkHEBadHs6MKu53BvZ8GAb5XEJbu3vMcy P2CJvoF7t0U+qFDasxsQbXm65NdP128jr/4sjAR0Yik9 X-Google-Smtp-Source: ABdhPJx8lhxnQPpePF0J+JlrzAdgrGdST83eccTcUN4wZtdwW1pgJ+hxTbjNNf/WRmkovWydhkOu1rkQzwlPrlGdbv0= X-Received: by 2002:a25:8e0d:: with SMTP id p13mr5830563ybl.155.1643080653884; Mon, 24 Jan 2022 19:17:33 -0800 (PST) List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 From: Lee D Date: Mon, 24 Jan 2022 22:16:58 -0500 Message-ID: Subject: Integrating UFS read-only code into my boot loader To: FreeBSD Hackers Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 4JjX8t5NMwz3rhT X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=GcoBKtXn; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of embaudarm@gmail.com designates 2607:f8b0:4864:20::b2b as permitted sender) smtp.mailfrom=embaudarm@gmail.com X-Spamd-Result: default: False [-1.20 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.20)[-0.200]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCPT_COUNT_ONE(0.00)[1]; MID_RHS_MATCH_FROMTLD(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::b2b:from]; NEURAL_SPAM_SHORT(1.00)[1.000]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; MLMMJ_DEST(0.00)[freebsd-hackers]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim] X-ThisMailContainsUnwantedMimeParts: N Hi, I am using my own bootloader to directly boot the FreeBSD 13 kernel on my custom Zynq (ARM) board. Currently, I load the kernel from a small DOS partition. I would like to try to integrate UFS into my bootloader so that I can read the kernel, modules and configuration directly from the UFS partition. It only needs to read, not write. In FreeBSD 11.0.1 there was file called: /src/sys/boot/common/ufsread.c That file seemed to be a complete UFS reader in a small, self contained package. It was deleted from the tree a long time ago though. Is this file still good for use with a UFS filesystem created with FreeBSD 13? I saw the whole package of files under /src/sys/ufs/, but those are deeply integrated into the world of the FreeBSD kernel and seem difficult to extract for use in a standalone, bare-metal bootloader program. Also open to other suggestions for how I might integrate UFS into my bootloader. Thanks, Lee