From owner-freebsd-current@freebsd.org Sat Jan 19 18:07:18 2019 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B2ABF148CA9F for ; Sat, 19 Jan 2019 18:07:18 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [104.236.120.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 840BE8D689 for ; Sat, 19 Jan 2019 18:07:17 +0000 (UTC) (envelope-from karl@denninger.net) Received: from denninger.net (ip68-1-57-197.pn.at.cox.net [68.1.57.197]) by colo1.denninger.net (Postfix) with ESMTP id 8F15E21108A for ; Sat, 19 Jan 2019 13:06:40 -0500 (EST) Received: from [192.168.1.101] (c-68-43-69-65.hsd1.mi.comcast.net [68.43.69.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id DD0A9B8686 for ; Sat, 19 Jan 2019 12:06:39 -0600 (CST) Subject: Re: GPT boot has less features than legacy MBR-based one (Was: UEFI, loader.efi and /boot.config) To: freebsd-current@freebsd.org References: <201901191632.x0JGWpkI061402@pdx.rh.CN85.dnsmgr.net> From: Karl Denninger Openpgp: preference=signencrypt Message-ID: <88d8b596-3d7b-3ed5-d046-d86731cbb23e@denninger.net> Date: Sat, 19 Jan 2019 12:06:38 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <201901191632.x0JGWpkI061402@pdx.rh.CN85.dnsmgr.net> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms060303090804010300090307" X-Rspamd-Queue-Id: 840BE8D689 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-4.42 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; HAS_ATTACHMENT(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; MX_GOOD(-0.01)[px.denninger.net]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(-2.01)[ip: (-9.85), ipnet: 104.236.64.0/18(-2.96), asn: 14061(2.84), country: US(-0.08)]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:14061, ipnet:104.236.64.0/18, country:US]; MIME_TRACE(0.00)[0:+,1:+,2:+]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_PBL(0.00)[197.57.1.68.zen.spamhaus.org : 127.0.0.11]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; SIGNED_SMIME(-2.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/alternative,text/plain]; RCVD_TLS_LAST(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; AUTH_NA(1.00)[]; RCPT_COUNT_ONE(0.00)[1]; DMARC_NA(0.00)[denninger.net]; NEURAL_SPAM_SHORT(0.80)[0.803,0]; R_SPF_NA(0.00)[] X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 Jan 2019 18:07:19 -0000 This is a cryptographically signed message in MIME format. --------------ms060303090804010300090307 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 1/19/2019 10:32, Rodney W. Grimes wrote: >> ...... > The BIOS does NOT do what our boot0 does, I have seen no BIOS that > well allow me to select a partition on a drive, you can only select > the drive. > > I think this is the feature that Lev is missing, and I am sure > others shall miss it to. > > IIRC whistle used a version of this so you could install a new system > to partion 2, keeping your current system in partion 1, and changing th= e > active back and forth. If we have lost that basic functionality with > the growth of GPT and UEFI that is a sad day. It is indeed, especially for embedded applications. I really, really like the fact that NanoBSD (on an MBR boot) can have two partitions and mark the "other one" as active; this then lets you update the code "in place" and as long as you are paying attention to what goes into the volatile overlays (specifically although not exclusively don't let /etc/fstab with a hard-coded filesystem reference get into there!) then you can "warm update" a running system and reboot into the new code. If something goes wrong re-marking the old partition active is not terribly hard, so there's a *reasonable* recovery path available. I've not found a reliable way to do that sort of thing with many of the "newer" small-board devices and I really like it on, for example, my apu2 firewall appliances that I and others are using all over the place in that being able to put together a code-fix update is of material value= =2E --=20 Karl Denninger karl@denninger.net /The Market Ticker/ --------------ms060303090804010300090307 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 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