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Sun, 23 Jan 2022 17:00:18 -0800 (PST) MIME-Version: 1.0 References: <1734A0D3-AA99-46AF-9A8C-5C0F0F642FBD@gmail.com> <4571c9726fb1df822f366e1f97dccdbe@hamnavoe.com> In-Reply-To: <4571c9726fb1df822f366e1f97dccdbe@hamnavoe.com> From: Thaddeus Woskowiak Date: Sun, 23 Jan 2022 19:59:50 -0500 Message-ID: Subject: Re: [9fans] Problems installing 9legacy on bare metal (Thinkpad X60) To: 9fans <9fans@9fans.net> Content-Type: text/plain; charset=UTF-8 Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 02f8733e-7cb1-11ec-8fd3-c8b9f18bb77f Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UYjVhYWY2NDY2MThhNDIxYS1NNjNlZmI2ZjMxMGJkYjA4NTM2NWRj?= =?UTF-8?B?MTVmPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Content-Transfer-Encoding: quoted-printable List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M63efb6f310bdb085365dc15f:1:0Gz_DyTwTYxOdxT8FaPXr7lAnLXxbLnqUdIJTLLUM0c On Sun, Jan 23, 2022 at 5:44 AM Richard Miller <9fans@hamnavoe.com> wrote: > > !rc (and the rest of the boot) is one of the first things implemented u= niquely by 9front. >=20 > I think there's a little bit of confusion about different stages of booti= ng. >=20 > The 9boot program loads the kernel. The original Plan 9 9boot is driven > by configuration variables in a plan9.ini file. Cinap's rewritten 9boot > adds the capability of interactively changing configuration variables from > the console before loading the kernel. That's really useful, especially > when experimenting with new kernels or new hardware. But 9boot does not > contain a shell or a built-in file system, so it doesn't allow you to > type !rc and get an interactive shell. >=20 > Once the kernel is loaded, the first thing it does is to execute the > command /boot/boot from a small root filesystem which is built into the > kernel. The main job of /boot/boot is to attach to the real root filesyst= em > (on a local device or from a network server) and execute /$cputype/init to > start the system. Historically the usual case is for /boot/boot to > be a specialised program built from C source in /sys/src/9/boot. But it > has always been possible to configure a kernel with a shell script as > /boot/boot - see for example /sys/lib/sysconfig/ppc/boot for the PowerPC, > or /sys/src/9/bcm/bootwifi.rc for a Raspberry Pi accessing its root file > server via wifi. >=20 > So, using a shell script as /boot/boot is not unique to 9front. But > with 9front, it has become the default. This means there's always a > shell inside the kernel, along with a few commands, ready to use > interactively when !rc is invoked - after the kernel is loaded, but > before the final root filesystem is attached. >=20 > The kernel on the 9legacy install CD doesn't have a shell script as > /boot/boot with the ability to invoke !rc. Perhaps it should. But that > wouldn't have helped in this case. Yakku was stuck at the 'Boot from' > prompt within /9boot, unable to find a kernel to boot. >=20 Richard, Thank you for the detailed explanation. I misread the part about no kernel and thought we made it to the boot prompt and could not figure out the disk name. Mea culpa. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tb5aaf646618a421a-M63efb= 6f310bdb085365dc15f Delivery options: https://9fans.topicbox.com/groups/9fans/subscription