Date: Sat, 19 Jan 2019 12:06:38 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-current@freebsd.org Subject: Re: GPT boot has less features than legacy MBR-based one (Was: UEFI, loader.efi and /boot.config) Message-ID: <88d8b596-3d7b-3ed5-d046-d86731cbb23e@denninger.net> In-Reply-To: <201901191632.x0JGWpkI061402@pdx.rh.CN85.dnsmgr.net> References: <201901191632.x0JGWpkI061402@pdx.rh.CN85.dnsmgr.net>
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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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