Date: Fri, 15 Jul 2016 10:28:32 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Bizarre clone attempt failures on Raspberry Pi2... Message-ID: <7ec73971-bc45-3e3c-2cb2-9ec9b9df3a4f@denninger.net> In-Reply-To: <CANCZdfoczKL-zX11S6FoyC98-K%2BDvzDXgDCEVFP1-PDA9FUBiQ@mail.gmail.com> References: <548783e1-9047-68f7-5f50-449db684d602@denninger.net> <d2eb4035-e494-1a7b-98e5-2aa87efe0763@denninger.net> <EDE65B12-4961-4CEF-8AE9-BFDA4FD508A5@gromit.dlib.vt.edu> <5475ea53-ae22-2634-6f2a-5737d1b0e308@denninger.net> <398ae56c-8893-f188-c210-cf7f19ccf433@denninger.net> <1468518953.72182.219.camel@freebsd.org> <7a91fc79-1c85-fac8-aa3f-db90592f3f44@denninger.net> <bec46aff-a4d5-9c4d-49d0-78534b13f719@denninger.net> <E01579F5-9562-4E51-9CFB-EA510460A4C8@gromit.dlib.vt.edu> <60b6e156-981e-9fbd-b68c-0daae1961286@denninger.net> <04391154-A38E-46CD-B570-B2BECFD19022@gromit.dlib.vt.edu> <d1aba096-e645-04df-dfda-5a9284250960@denninger.net> <CANCZdfoczKL-zX11S6FoyC98-K%2BDvzDXgDCEVFP1-PDA9FUBiQ@mail.gmail.com>
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This is a cryptographically signed message in MIME format. --------------ms030704040203050106050807 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 7/15/2016 09:53, Warner Losh wrote: > I saw your failok PR. That's a good idea. > > A better idea, though, is to implement true dual-console mode where > both the kernel *AND* /etc/rc run on both the serial and the video > consoles. I've poked at this in the past, but have never had time to > fully implement it due to other things being more pressing. > > Warner Agreed. The best option is the one that exposes what is going on in a way that is *usable* to those in any reasonable set of expected "base" configurations. But for now "failok" is better than nothing. BTW I've run into some very nasty microSD card failure modes of late on these devices and suspect that atime is thrashing them in terms of write endurance, resulting in the destruction of several cards after approximately 9 months of "always on" use. The symptom is that you wind up with a hard error in a given location on the card and there's nothing you can do about it; this results in repeated panics. This has now destroyed three Sandisk 32Gb cards here in the last two weeks, all on different Pi2s doing different things, two of which were on UPS-protected power and thus hadn't taken unprotected shutdowns. As a result I am now mounting root "noatime" which should materially decrease the write load. For most users with these devices in common configurations that isn't going to include a serial console. Hell, I don't usually have one hooked up, although I *can*, because it's just flat-out simpler to plug in a monitor and USB keyboard. For the common person who buys a Pi2 to screw around they will likely not have a serial console available to them at all. Indeed the opposite situation exists in the Intel world; it's a royal PITA to run serial as a primary console that "just works" on servers (in fact I've never found the "recipe" for doing so that doesn't leave me with an exposure where a particular mode of failure might leave me with no way to get in and resolve whatever is broken, including BIOS access), which is why built-in IPMI KVMs are such a big deal on those boards -- they "just work" for the "expected" circumstance that "mirrors" what the common user expects and has. BTW uboot is allegedly able to support a USB keyboard. I don't know if the version we are currently using does, but it allegedly is capable of doing so in the current code that is out there. In addition, how does one change the 10 second boot delay in the current kernel to something shorter? /boot/loader.conf is ignored on ARM systems since they're loaded with uboot, yes? --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms030704040203050106050807 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 Bl8wggZbMIIEQ6ADAgECAgEpMA0GCSqGSIb3DQEBCwUAMIGQMQswCQYDVQQGEwJVUzEQMA4G A1UECBMHRmxvcmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3Rl bXMgTExDMRwwGgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhND dWRhIFN5c3RlbXMgTExDIENBMB4XDTE1MDQyMTAyMjE1OVoXDTIwMDQxOTAyMjE1OVowWjEL MAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxHjAcBgNVBAMTFUthcmwgRGVubmluZ2VyIChPQ1NQKTCCAiIwDQYJKoZIhvcNAQEBBQAD ggIPADCCAgoCggIBALmEWPhAdphrWd4K5VTvE5pxL3blRQPyGF3ApjUjgtavqU1Y8pbI3Byg XDj2/Uz9Si8XVj/kNbKEjkRh5SsNvx3Fc0oQ1uVjyCq7zC/kctF7yLzQbvWnU4grAPZ3IuAp 3/fFxIVaXpxEdKmyZAVDhk9az+IgHH43rdJRIMzxJ5vqQMb+n2EjadVqiGPbtG9aZEImlq7f IYDTnKyToi23PAnkPwwT+q1IkI2DTvf2jzWrhLR5DTX0fUYC0nxlHWbjgpiapyJWtR7K2YQO aevQb/3vN9gSojT2h+cBem7QIj6U69rEYcEDvPyCMXEV9VcXdcmW42LSRsPvZcBHFkWAJqMZ Myiz4kumaP+s+cIDaXitR/szoqDKGSHM4CPAZV9Yh8asvxQL5uDxz5wvLPgS5yS8K/o7zDR5 vNkMCyfYQuR6PAJxVOk5Arqvj9lfP3JSVapwbr01CoWDBkpuJlKfpQIEeC/pcCBKknllbMYq yHBO2TipLyO5Ocd1nhN/nOsO+C+j31lQHfOMRZaPQykXVPWG5BbhWT7ttX4vy5hOW6yJgeT/ o3apynlp1cEavkQRS8uJHoQszF6KIrQMID/JfySWvVQ4ksnfzwB2lRomrdrwnQ4eG/HBS+0l eozwOJNDIBlAP+hLe8A5oWZgooIIK/SulUAsfI6Sgd8dTZTTYmlhAgMBAAGjgfQwgfEwNwYI KwYBBQUHAQEEKzApMCcGCCsGAQUFBzABhhtodHRwOi8vY3VkYXN5c3RlbXMubmV0Ojg4ODgw CQYDVR0TBAIwADARBglghkgBhvhCAQEEBAMCBaAwCwYDVR0PBAQDAgXgMCwGCWCGSAGG+EIB DQQfFh1PcGVuU1NMIEdlbmVyYXRlZCBDZXJ0aWZpY2F0ZTAdBgNVHQ4EFgQUxRyULenJaFwX RtT79aNmIB/u5VkwHwYDVR0jBBgwFoAUJHGbnYV9/N3dvbDKkpQDofrTbTUwHQYDVR0RBBYw FIESa2FybEBkZW5uaW5nZXIubmV0MA0GCSqGSIb3DQEBCwUAA4ICAQBPf3cYtmKowmGIYsm6 eBinJu7QVWvxi1vqnBz3KE+HapqoIZS8/PolB/hwiY0UAE1RsjBJ7yEjihVRwummSBvkoOyf G30uPn4yg4vbJkR9lTz8d21fPshWETa6DBh2jx2Qf13LZpr3Pj2fTtlu6xMYKzg7cSDgd2bO sJGH/rcvva9Spkx5Vfq0RyOrYph9boshRN3D4tbWgBAcX9POdXCVfJONDxhfBuPHsJ6vEmPb An+XL5Yl26XYFPiODQ+Qbk44Ot1kt9s7oS3dVUrh92Qv0G3J3DF+Vt6C15nED+f+bk4gScu+ JHT7RjEmfa18GT8DcT//D1zEke1Ymhb41JH+GyZchDRWtjxsS5OBFMzrju7d264zJUFtX7iJ 3xvpKN7VcZKNtB6dLShj3v/XDsQVQWXmR/1YKWZ93C3LpRs2Y5nYdn6gEOpL/WfQFThtfnat HNc7fNs5vjotaYpBl5H8+VCautKbGOs219uQbhGZLYTv6okuKcY8W+4EJEtK0xB08vqr9Jd0 FS9MGjQE++GWo+5eQxFt6nUENHbVYnsr6bYPQsZH0CRNycgTG9MwY/UIXOf4W034UpR82TBG 1LiMsYfb8ahQJhs3wdf1nzipIjRwoZKT1vGXh/cj3gwSr64GfenURBxaFZA5O1acOZUjPrRT n3ci4McYW/0WVVA3lDGCBRMwggUPAgEBMIGWMIGQMQswCQYDVQQGEwJVUzEQMA4GA1UECBMH RmxvcmlkYTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExD MRwwGgYDVQQDExNDdWRhIFN5c3RlbXMgTExDIENBMSIwIAYJKoZIhvcNAQkBFhNDdWRhIFN5 c3RlbXMgTExDIENBAgEpMA0GCWCGSAFlAwQCAwUAoIICTTAYBgkqhkiG9w0BCQMxCwYJKoZI hvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNjA3MTUxNTI4MzJaME8GCSqGSIb3DQEJBDFCBEDH MS+i6qyu44bkmWjLcyfFC6GGtpaJ/gt9GuoxnGHTrNiRCqw5AmgxuXMbdyILfFwFeziYhkxV CGpkHIG0tuW1MGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEqMAsGCWCGSAFlAwQBAjAK BggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAwBwYFKw4DAgcwDQYI KoZIhvcNAwICASgwgacGCSsGAQQBgjcQBDGBmTCBljCBkDELMAkGA1UEBhMCVVMxEDAOBgNV BAgTB0Zsb3JpZGExEjAQBgNVBAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1z IExMQzEcMBoGA1UEAxMTQ3VkYSBTeXN0ZW1zIExMQyBDQTEiMCAGCSqGSIb3DQEJARYTQ3Vk YSBTeXN0ZW1zIExMQyBDQQIBKTCBqQYLKoZIhvcNAQkQAgsxgZmggZYwgZAxCzAJBgNVBAYT AlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1 ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExIjAgBgkqhkiG 9w0BCQEWE0N1ZGEgU3lzdGVtcyBMTEMgQ0ECASkwDQYJKoZIhvcNAQEBBQAEggIAuPF40gzl kpqdhdWpIS+HWEquYjGex3qKD07rnE4mIbJhDNe9UF04WVnW8arj+NNi055p4a7Pvf3cUudy +OR/j3pSHfI9TU1H/SQKEKQQPfr33r9ktTIQ0jIi007Xd/PINeJUORM+gb+zrfaQ7LbJZYLw zp2k3PGeAHG52eCMNRvBY/iVHY5TispTD4HJAaPkjg7pnvN2d310DeAE11ujIBdjRl/IVOT/ TLRf8XbMR1bNPQTMUZ+JNqoGRe2tAbO1RcVlKhHwXWLcknUc7zSU2TlGzTPgYtlzoPU/wd62 35plZjaoZGr7GI3quIyX66zGgKCbIUdP5NZblRfDCUYm5LOg+xvbz/Milv23GkV1U1Ly0LLS 7HWPBWIc9V9HDl7GCSY3Np6DjTSODv9tYoDVt091WKFwLCvnVJjjPIIWulkUcfC5+ZTwUrWB M0s7pXOetrt4tTdEgK1RAxxvbp/+hyuulEvn3V8Gmr64qKhg/FKVRGTAQXMu6trQ9IOCmmoc BVVTX+ESlDo8hpc9zkgpL/rBg++H5YsFS0OPIHBYw3Ard2eq8ORaxmYPVPV06TG4XUrdMaLl wMQDllVGL4s3v137VQWMG9AurpChcs3WuKlZVJa3O+r8VBFMEDPJhsJOswT4TQW0tyTKKVDB 8/5oL4tkWH9JjbKN3OjSdDY+Os4AAAAAAAA= --------------ms030704040203050106050807--
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