From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] pi4 USB '/boot/kfs' error
Date: Sat, 7 Jan 2023 19:49:48 +0000 [thread overview]
Message-ID: <baf38d3a75b4e6381244e8953ceb7c84@hamnavoe.com> (raw)
In-Reply-To: <BDC56530-D966-440E-8068-4B918DEC47E0@germteig.com>
marco@germteig.com:
> I am running the Dec 22 9legacy on a machine, and now want to create a bootable USB on it.
> The USB is for a raspberry pi 4 4GB, acting as a standalone auth only.
When you say "bootable USB", do you want to boot the pi4 without an
SD card, and just a USB drive?
If you're happy to have both SD card and USB drive, you can use the
SD card to hold a DOS partition (with bootable kernel and cmdline.txt)
and a fsconfig partition (to hold a partition configuration for a
/dev/fs device (see fs(3)) which maps the USB drive. This is what I do
to set up a pi4 file server with fossil on a SSD drive. My pi4 kernel
config doesn't have partfs, fdisk and prep in the bootdir section,
and does have fs in the dev section. The cmdline.txt is
readparts=1 nvram=#S/sdM0/nvram fsconfig=#S/sdM0/fscfg bootargs=local!/dev/sdXX/fossil
and the fscfg partition on the SD card looks like this (the fsdev:
first line seems to be undocumented)
fsdev:
part sdXX/nvram /dev/sdU0.0/data 2096640 512
part sdXX/fossil /dev/sdU0.0/data 2097152 8192000000
part sdXX/swap /dev/sdU0.0/data 8194097152 2048000000
... plus some other partitions for venti, etc
I use the fs(3) device because I haven't been able to get partfs(8)
to work at boot time. I think there may be a bug in /sys/src/9/boot
where an extra re-mount is missed out.
If you want to boot the pi4 completely from a USB drive, with no
SD card present (I've never tried this), you'll need an alternative
place for a fs(3) configuration (maybe in the built-in bootdir in
the kernel?), or the boot code will need tweaking to get the partfs(8)
partitions re-mounted at the right time.
------------------------------------------
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next prev parent reply other threads:[~2023-01-07 19:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-07 17:40 Marco Feichtinger
2023-01-07 19:49 ` Richard Miller [this message]
2023-01-07 20:53 ` Marco Feichtinger
2023-01-07 22:21 ` Richard Miller
2023-01-08 15:59 ` Richard Miller
2023-01-08 17:36 ` Marco Feichtinger
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