How to build working images for RPI

Sun Dec 1 22:47:34 UTC 2019

On 12/1/2019 16:35, Mike Karels wrote:
> (Sorry, I'm using a UTF-8-challenged mailer at the moment...)
>
> Jose wrote:
>> Hi,
>> images built with crochet are not working (no boot,
>> no nothing) on RPI but images downloaded from
>> https://download.freebsd.org/ftp/snapshots/arm/armv6/ISO-IMAGES do
>> How do they build the downloadable images?
>> The wiki
>> https://wiki.freebsd.org/arm/Raspberry%20Pi
>> states that you can build your own images with crochet
>> but it does not state how THEY build the working images
>> that are on the FTP site.
>> I notice that the images built with crochet are VERY different
>> from the ones you download, for example:
>> md0 has the crochet image, md1 the downloaded one
>> crochet # gpart show md0
>> =>      1  5859374  md0  MBR  (2.8G)
>>          1       62       - free -  (31K)
>>         63    34776    1  fat32lba  [active]  (17M)
>>      34839     1001       - free -  (501K)
>>      35840  5823488    2  freebsd  (2.8G)
>>    5859328       47       - free -  (24K)
>> crochet # gpart show md1
>> =>     63  6291393  md1  MBR  (3.0G)
>>         63     1008       - free -  (504K)
>>       1071   102312    1  fat32lba  [active]  (50M)
>>     103383  6188049    2  freebsd  (3.0G)
>>    6291432       24       - free -  (12K)
>> rochet # ll /mnt/md0/boot/msdos/
>> total 2448
>> -rwxr-xr-x  1 root  wheel      765 Nov 23 15:53 README*
>> -rwxr-xr-x  1 root  wheel      199 Nov 23 15:53 boot.scr*
>> -rwxr-xr-x  1 root  wheel       75 Nov 23 15:53 config.txt*
>> -rwxr-xr-x  1 root  wheel       37 Nov 23 15:53 metadata*
>> -rwxr-xr-x  1 root  wheel    19602 Nov 23 15:53 rpi.dtb*
>> -rwxr-xr-x  1 root  wheel    21186 Nov 23 15:53 rpi.dts*
>> -rwxr-xr-x  1 root  wheel   465860 Nov 23 15:53 u-boot.bin*
>> -rwxr-xr-x  1 root  wheel        0 Nov 23 15:53 uEnv.txt*
>> -rwxr-xr-x  1 root  wheel  1586895 Nov 23 15:53 ubldr*
>> -rwxr-xr-x  1 root  wheel   386184 Nov 23 15:53 ubldr.bin*
>> crochet # ll /mnt/md1/boot/msdos/
>> total 13460
>> drwxr-xr-x  1 root  wheel     4096 Nov 21 04:55 EFI/
>> -rwxr-xr-x  1 root  wheel    23315 Nov 12  2018 bcm2708-rpi-0-w.dtb*
>> -rwxr-xr-x  1 root  wheel    23071 Nov 12  2018 bcm2708-rpi-b-plus.dtb*
>> -rwxr-xr-x  1 root  wheel    22812 Nov 12  2018 bcm2708-rpi-b.dtb*
>> -rwxr-xr-x  1 root  wheel    22589 Nov 12  2018 bcm2708-rpi-cm.dtb*
>> -rwxr-xr-x  1 root  wheel    52116 Nov 12  2018 bootcode.bin*
>> -rwxr-xr-x  1 root  wheel       89 Nov 21 03:11 config.txt*
>> drwxr-xr-x  1 root  wheel     4096 Nov 21 04:55 dtb/
>> -rwxr-xr-x  1 root  wheel     6666 Nov 12  2018 fixup.dat*
>> -rwxr-xr-x  1 root  wheel     2621 Nov 12  2018 fixup_cd.dat*
>> -rwxr-xr-x  1 root  wheel     9895 Nov 12  2018 fixup_db.dat*
>> -rwxr-xr-x  1 root  wheel     9895 Nov 12  2018 fixup_x.dat*
>> drwxr-xr-x  1 root  wheel     4096 Nov 21 04:55 overlays/
>> -rwxr-xr-x  1 root  wheel  2857060 Nov 12  2018 start.elf*
>> -rwxr-xr-x  1 root  wheel   678532 Nov 12  2018 start_cd.elf*
>> -rwxr-xr-x  1 root  wheel  5120484 Nov 12  2018 start_db.elf*
>> -rwxr-xr-x  1 root  wheel  4057956 Nov 12  2018 start_x.elf*
>> -rwxr-xr-x  1 root  wheel   465868 Nov 21 03:06 u-boot.bin*
>> -r-xr-xr-x  1 root  wheel   386408 Nov 21 04:48 ubldr.bin*
>> crochet # cat /mnt/md0/boot/msdos/config.txt
>> gpu_mem=32
>> device_tree=rpi.dtb
>> device_tree_address=0x100
>> kernel=u-boot.bin
>> crochet # cat /mnt/md1/boot/msdos/config.txt
>> init_uart_clock=3000000
>> enable_uart=1
>> kernel=u-boot.bin
>> kernel7=u-boot.bin
>> dtoverlay=mmc
>> I had to patch crochet to have the image built, but that's another
>> story.
>> Can anyone point me on how to build working images
>> for RPI?
> I'm not an expert, having done this for the first time yesterday, but
> the short answer is like this:
>
> 	cd ^/release/; ./release.sh -c arm64/RPI3.conf
>
> Note that this will build a complete chroot for the build system, including
> ports, with sources that it checks out, and then builds the target system.
> The chroot is built in /scratch.  I built from head on amd64.
>
> 		Mike
> _______________________________________________

Depends on what you want.

Crochet builds a system that runs read-only off the SD card, leveraging
the "diskless" paradigm to pretend it's an NFS-mounted, tftp/bootp
loaded client.  Except it isn't; the writeable bits are on a ramdisk.

This makes the resulting system exceptionally fault-tolerant but does
require that configuration changes and the like be "noticed" back (there
are tools in the root directory to copy them back)

If you want a "traditional" system then the above is how you build it. 
But be aware that on the Pi specifically the SD controller is
usb-attached and slow.

I use Crochet all the time to build Pi-specific images and while there
have been small changes required from time to time it works fine for
12.x images at present.  I have not (yet) tried building one with -HEAD.

-- 
Karl Denninger
karl at denninger.net <mailto:karl at denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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