Date: Thu, 23 Apr 2020 15:49:07 -0700 From: Mark Millard <marklmi@yahoo.com> To: Jonathan Chen <jonc@chen.org.nz>, bob prohaska <fbsd@www.zefox.net> Cc: freebsd-arm <freebsd-arm@freebsd.org>, Georg Lindenberg <georg.lindenberg@web.de> Subject: Re: Booting from USB on RPI3 Message-ID: <E5FA075C-C969-48F7-A20A-30FA06862D42@yahoo.com> In-Reply-To: <A85E6F37-A916-44F6-80E0-3C097C3CDCED@yahoo.com> References: <mailman.61.1587470402.80084.freebsd-arm@freebsd.org> <trinity-4938b1d4-f29f-4907-bedd-65be21112e48-1587489497227@3c-app-webde-bs65> <20200421181224.GC96994@www.zefox.net> <trinity-19081201-3024-4046-817a-48321c51a515-1587587309088@3c-app-webde-bap64> <20200423162124.GA3583@www.zefox.net> <CAJuc1zMHL6ke3LH67iV8%2BogKFO18xwW_v7bRAUsj8CbxD2EOTw@mail.gmail.com> <8D1F6A8D-4910-4C1E-8EB5-2F5F89E31120@yahoo.com> <CAJuc1zOTnoRmeaKXHMTH9po=6ipBYDxvxAoiVmow-sNgwUERVQ@mail.gmail.com> <A85E6F37-A916-44F6-80E0-3C097C3CDCED@yahoo.com>
index | next in thread | previous in thread | raw e-mail
On 2020-Apr-23, at 14:20, Mark Millard <marklmi at yahoo.com> wrote: > On 2020-Apr-23, at 13:32, Jonathan Chen <jonc at chen.org.nz> wrote: > >> On Fri, 24 Apr 2020 at 08:22, Mark Millard <marklmi@yahoo.com> wrote: >> [...] >>> The RPi3 will not start to boot from a gpt partitioned >>> media. So picking gpt labeling as the example is somewhat >>> misleading for single-media booting. glabel based >>> labeling would be more realistic for the context. > > Note the "single-media booting" reference above. > >> The OP is attempting to boot off an external USB drive via loader.env. >> So it's the external drive's partitioning system that is of interest. >> FYI, my RPI3 boots off a GPT partition fine: >> >> 1.topaz:~,8:30am# uname -a >> FreeBSD topaz.inside.chen.org.nz 12.1-STABLE FreeBSD 12.1-STABLE #0 >> r358927: Sun Mar 15 22:24:30 NZDT 2020 >> jonc@onyx.inside.chen.org.nz:/xbuilds/rpi3/obj/usr/src/arm64.aarch64/sys/GENERIC >> arm64 >> 1.topaz:~,8:30am# gpart show -l da0 >> => 40 976773088 da0 GPT (466G) >> 40 8152 - free - (4.0M) >> 8192 964689920 1 topaz-root (460G) >> 964698112 12075016 2 topaz-swap (5.8G) >> >> 1.topaz:~,8:30am# cat /etc/fstab >> # Device Mountpoint FStype Options Dump Pass# >> /dev/gpt/topaz-root / ufs rw 1 1 >> /dev/gpt/topaz-swap none swap sw 0 0 >> > > That does not appear to have the msdosfs/EFI material > on the USB drive. So I'd guess that you are using > the microsd card for that: 2 media overall, not > single-media. > > I also use a form of two-media instead of single-media > and use gpt on the USB media: > > # gpart show > => 63 249737153 mmcsd0 MBR (119G) > 63 16380 - free - (8.0M) > 16443 131040 1 fat32lba [active] (64M) > 147483 997 - free - (499K) > 148480 241172480 2 freebsd (115G) > 241320960 8416256 - free - (4.0G) > > => 0 241172480 mmcsd0s2 BSD (115G) > 0 230686720 1 freebsd-ufs (110G) > 230686720 10485760 - free - (5.0G) > > => 40 468862048 da0 GPT (224G) > 40 2008 - free - (1.0M) > 2048 413138944 1 freebsd-ufs (197G) > 413140992 6291456 2 freebsd-swap (3.0G) > 419432448 6291456 4 freebsd-swap (3.0G) > 425723904 43138184 - free - (21G) > > # df -m > Filesystem 1M-blocks Used Avail Capacity Mounted on > /dev/gpt/PINE642Groot 195378 34775 144973 19% / > devfs 0 0 0 100% /dev > /dev/label/PINE64P2Groot 109101 219 100153 0% /microsd_ufs > /dev/label/PINE642GAboot 63 43 20 69% /boot/efi > > I choose to have a copy of /boot on /microsd_ufs > and to use vfs.root.mountfrom="ufs:/dev/gpt/PINE642Groot" > in the loader.conf file in my context. > > But such is not what Bob P. is trying to do from what > I can tell. He looks to be trying to avoid microsd > card media use if he can. He needs MBR on the USB > media for that (or some hybrid MBR that proves > compatibile). Correcting my mistaken memory of what raspberrypi.org documents . . . The BCM2837 (RPi3) and BCM2837B0 (RPi3B) have documentation at: https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/bootflow.md that does report: • The boot ROM also now supports GUID partitioning and has been tested with hard drives partitioned using Mac, Windows, and Linux. It also notes (prior to the above): • It is no longer necessary for the first partition to be the FAT partition, as the MSD boot will continue to search for a FAT partition beyond the first one. (I guess MSD is short for "mass storage device".) It also documents that for USB hubs these RPi3* vintages do recurse for each port. === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?E5FA075C-C969-48F7-A20A-30FA06862D42>