{"id":1802,"date":"2019-09-23T11:08:27","date_gmt":"2019-09-23T09:08:27","guid":{"rendered":"http:\/\/www.moreware.org\/wp\/?p=1802"},"modified":"2020-01-16T17:59:22","modified_gmt":"2020-01-16T16:59:22","slug":"kernel-64bit-ospite-su-os-desktop-raspbian-a-32bit","status":"publish","type":"post","link":"https:\/\/www.moreware.org\/wp\/blog\/2019\/09\/23\/kernel-64bit-ospite-su-os-desktop-raspbian-a-32bit\/","title":{"rendered":"Kernel 64bit ospite su OS desktop Raspbian a 32bit"},"content":{"rendered":"<p><em>Ecco una immagine di boot per RPi4 B e RPi3 B\/B+ con kernel a 64-bit, basato su OS host 32-bit Raspbian Buster &#8216;Desktop&#8217;, con un OS ospite 64-bit Debian Buster in un container leggero in autostart con <code>systemd-nspawn<\/code>.<\/em><\/p>\n<p>Il GIT repository di Sakaki ci aveva gi\u00e0 offerto una distro di Gentoo a 64 bit configurata per <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=82656ec7b17752ecd8d9f7203c331310&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=raspberry, raspberrypi, raspberry PI\">Raspberry PI<\/a>. Era un OS che risolveva i problemi e le necessit\u00e0 di coloro che chiedevano di poter lanciare applicazioni a 64bit native. Ne avevamo <a href=\"https:\/\/www.moreware.org\/wp\/blog\/2019\/07\/20\/teoria-dei-numeri-con-raspberry-pi\/\">parlato anche noi<\/a> in un articolo dello scorso 20 luglio. Ma evidentemente <a href=\"https:\/\/www.moreware.org\/wp\/blog\/tag\/Raspbian\">Raspbian<\/a> vanta un bacino di utenza non indifferente, con utenti e sviluppatori abituati ai tool offerti dal sistema e poco propensi a cambiare. Per tale ragione si \u00e8 deciso di creare un branch di sviluppo ed offrire funzionalit\u00e0 a <a href=\"https:\/\/www.moreware.org\/wp\/blog\/tag\/64-bit\">64-bit<\/a> senza abbandonare la solida e sicura interfaccia grafica.<\/p>\n<p>Il presente progetto comprende una <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=c1fc357a7b8ab1c70d18cad43dbf76d4&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=SD, microsd, minisd\">microSD<\/a> bootabile, contenente un <strong>kernel a 64-bit, il sistema operativo Desktop Raspbian Buster 32-bit + una immagine del sistema operativo ospite a 64-bit Debian Buster guest OS per <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=82656ec7b17752ecd8d9f7203c331310&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=raspberry, raspberrypi, raspberry PI\">Raspberry Pi<\/a> 4 model B, e Pi 3 model B\/B+<\/strong>. Si tratta di un progetto dedicato a quegli utenti che preferiscono mantenere l&#8217;utilizzo dei familiari tool di Raspbian ed i relativi repositories software, ma che hanno comunque la necessit\u00e0 di far girare uno o pi\u00f9 componenti software a 64-bit sul proprio PI.<\/p>\n<p>Il sistema operativo ospite 64-bit Debian viene lanciato automaticamente all&#8217;interno di un container <a href=\"https:\/\/www.freedesktop.org\/software\/systemd\/man\/systemd-nspawn.html\" rel=\"nofollow\"><code>systemd-nspawn<\/code><\/a>. Attraverso un elemento di men\u00f9 apposito fornito dal <code>System Tools<\/code>, sar\u00e0 quindi possibile aprire una shell a 64-bit all&#8217;interno del container (ad esempio per installare un nuovo package 64-bit). Un altro elemento di men\u00f9 consente invece di <em>lanciare<\/em> senza problemi una applicazione a 64-bit nel container. Configurato in modo che appaiano sullo schermo Raspbian, si interfacciano con l&#8217;audio ed hanno accesso alla home directory dell&#8217;utente corrente.<\/p>\n<p>Grazie alla <em>containerization<\/em>, queste applicazioni restano comunque impossibilitate a compiere azioni potenzialmente dannose sull&#8217;host (non si tratta di un semplice <a href=\"https:\/\/en.wikipedia.org\/wiki\/Chroot\" rel=\"nofollow\"><code>chroot<\/code><\/a>). La gestione dei pacchetti nel sistema ospite utilizza la funzione familiare <code>apt-get<\/code>, ma con l&#8217;intero repository Debian aarch64 disponibile, mentre l&#8217;operativit\u00e0 <em>Raspbian<\/em> quotidiana (ad eccezione diquello che necessita di <a href=\"https:\/\/github.com\/raspberrypi\/firmware\/issues\/550#issuecomment-190803961\" rel=\"nofollow\">MMAL o OpenMAX IL<\/a>) rimane praticamente identica a quella della stock image. WiFi, Bluetooth, I<sup>2<\/sup>C sono tutte funzionanti, e le applicazioni Raspbian 32-bit possono essere installate e utilizzate come su di un normale sistema RPi.<\/p>\n<p>Per facilitare l&#8217;utilizzazione, nella versione 1.1.0 i <em>launchers<\/em> per le applicazioni 64-bit sono aggiunti automaticamente al men\u00f9 host 32-bit durante l&#8217;installazione, mentre la modifica verso l&#8217;utenza &#8216;regolare&#8217; (esistenza, password e gruppi primari) vengono trasferiti automaticamente da host a guest. Nella versione 1.2.0, anche le modifiche su timezone o locale nell&#8217;host vengono propagate automaticamenteal guest. Infine, nella versione 1.3.0, <strong>viene supportato anche il RPi4;<\/strong> viene impiegato un sistema operativo host Raspbian Buster, e utilizzato un <a href=\"https:\/\/www.raspberrypi.org\/forums\/viewtopic.php?f=29&amp;t=250730\" rel=\"nofollow\">kernel 64-bit ufficiale<\/a> (al posto del precedente kernel custom).<\/p>\n<p>In pratica si guadagna la possibilit\u00e0 di lavorare a 64-bit, ma senza perdere la testa dietro nuove distro.<\/p>\n<p>DI seguito un esempio di immagine del nuovo sistema operativo che gira su di un RPi 4B:<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1804 size-full\" src=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-full-a.jpg?resize=793%2C448&#038;ssl=1\" alt=\"Kernel 64bit ospite Raspbian\" width=\"793\" height=\"448\" srcset=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-full-a.jpg?w=1000&amp;ssl=1 1000w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-full-a.jpg?resize=300%2C170&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-full-a.jpg?resize=768%2C434&amp;ssl=1 768w\" sizes=\"auto, (max-width: 793px) 100vw, 793px\" \/><\/p>\n<p>L&#8217;immagine del sistema operativo e le relative istruzioni di installazione si trovano <a href=\"https:\/\/github.com\/sakaki-\/raspbian-nspawn-64\" rel=\"nofollow\">a questo link<\/a>.<\/p>\n<p>Mai come in questo caso \u00e8 opportuno leggere le istruzioni prima di procedere con l&#8217;installazione. Si tratta di software offerto &#8216;as is&#8217;, senza alcuna garanzia. Altrettanto importante \u00e8 ricordare la distinzione tra licenze software free e non-free. Ovvero le richieste di firmware, software di boot e pacchetti OS offerti con l&#8217;immagine. <a href=\"https:\/\/github.com\/sakaki-\/raspbian-nspawn-64\/tree\/master\/licenses\">Qui<\/a> \u00e8 presente una lista esplicativa al riguardo.<\/p>\n<p>Si tenga infine presente che ci troviamo di fronte ad un <strong>rilancio di Raspbian non ufficiale e gestio da utente. P<\/strong>ertanto non riconsociuto n\u00e9 supportato dalla <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=82656ec7b17752ecd8d9f7203c331310&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=raspberry, raspberrypi, raspberry PI\">Raspberry Pi<\/a> foundation. Non sono comunque state eseguite modifiche fondamentali al sistema operativo host Raspbian o all&#8217;ospite Debian.<\/p>\n<blockquote><p>Conviene installare questa immagine su di una <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=c1fc357a7b8ab1c70d18cad43dbf76d4&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=SD, microsd, minisd\">microSD<\/a> card <strong>diversa<\/strong> da quella utilizzata per il sistema Raspbian di default. In tal modo, al termine dei test sar\u00e0 sufficiente spegnere, scambiare le schede, rilanciare il sistema per tornare ad avere la configurazione originale.<\/p><\/blockquote>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1806 size-full\" src=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-ds64-runner-a.jpg?resize=793%2C448&#038;ssl=1\" alt=\"Kernel 64bit ospite Raspbian\" width=\"793\" height=\"448\" srcset=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-ds64-runner-a.jpg?w=900&amp;ssl=1 900w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-ds64-runner-a.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2019\/09\/raspbian-nspawn-ds64-runner-a.jpg?resize=768%2C433&amp;ssl=1 768w\" sizes=\"auto, (max-width: 793px) 100vw, 793px\" \/><\/p>\n<p>Ultima valutazione. Trattandosi di un siistema <em>containerizzato,\u00a0<\/em>l&#8217;efficienza delle applicazioni a 64 bit potrebbe essere di qualche punto percentuale inferiore rispetto ad una installazione nativa. Questo perch\u00e9 il sistema operativo dovr\u00e0 gestire contemporaneamente sia l&#8217;applicazione che il container. &#8220;Rubando&#8221; preziosi cicli di CPU attraverso le relative chiamate di sistema. Ma si tratter\u00e0 nella peggiore delle ipotesi di un rallentamento non percepibile sensorialmente, e di esclusivo interesse per gli utenti alla ricerca della massima efficienza possibile. &gt;Quellic he in genere instaallano direttamente una distro a 64-bit&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ecco una immagine di boot per RPi4 B e RPi3 B\/B+ con kernel a 64-bit, basato su OS host 32-bit Raspbian Buster &#8216;Desktop&#8217;, con un OS ospite 64-bit Debian Buster in un container leggero in autostart con systemd-nspawn. Il GIT repository di Sakaki ci aveva gi\u00e0 offerto una distro di<\/p>\n","protected":false},"author":1,"featured_media":1804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[12,2,13],"tags":[20,16,5,22,153],"class_list":["post-1802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arm","category-raspberry-pi","category-sistemi-operativi","tag-64-bit","tag-arm","tag-raspberry","tag-raspbian","tag-sistemi-operativi","has-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kernel 64bit ospite su OS desktop Raspbian a 32bit - Moreware Blog<\/title>\n<meta name=\"description\" content=\"E&#039; stata rilasciata una versione modificata di Raspbian con un kernel a 64bit ospite all&#039;internodi un container. 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