James Choate (email@example.com) 1 & 2
1. Confusion Research Center (http://confusionresearchcenter.org)
2. Central Texas Commodore User Group, Round Rock, TX. (http://www.meetup.com/Central-Texas-Commodore-Users-Group/)
Installing Plan 9 on a Raspberry Pi 3
These are the notes taken in the planning and initial execution phase of this project from 10 - 15 August 2016.This is commentary added after the installation and is intended to go into more details about why we did what we did, and what we learned.
We've been intermittent Plan 9 users since the early 90s when the OS first became available to academic sites only. It's a next generation Unix that addresses many of the issues that were found with the Unix approach. It also brough in the first wave of distributed (what we call cloud services now) computing along with the Amoeba OS (which gave us Python). It consists of process, filesystem, I/O, and authorization servers that use a 'everything is a file' interface.
System: Raspberry Pi 3 Installation Process: Warning: Always work from copies if any master SD cards, the installation process wipes out the original contents when the install is done.We need to find out what device the SD Card is and then unmount it.
diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *750.2 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 749.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +748.9 GB disk1 Logical Volume on disk0s2 6E72CCC4-6962-45CE-BA7C-C1FFCC660C38 Unencrypted /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_HFS MORGUE 999.8 GB disk2s2 /dev/disk3 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *15.7 GB disk3 1: Windows_FAT_16 RECOVERY 1.2 GB disk3s1 2: Linux 33.6 MB disk3s5 diskutil unmountDisk /dev/disk3 Sanger:RPi Plan 9 Install JamesChoate$ diskutil unmountDisk /dev/disk3 Unmount of all volumes on disk3 was successfulNow we format it (FAT 32 in this case) and put the Plan 9 image (9pi.img) onto it.
sudo newfs_msdos -F 32 /dev/disk3 Sanger:RPi Plan 9 Install JamesChoate$ sudo newfs_msdos -F 32 /dev/disk3 Password: newfs_msdos: warning: /dev/disk3 is not a character device 512 bytes per physical sector /dev/disk3: 30665440 sectors in 1916590 FAT32 clusters (8192 bytes/cluster) bps=512 spc=16 res=32 nft=2 mid=0xf0 spt=32 hds=255 hid=0 drv=0x00 bsec=30695424 bspf=14974 rdcl=2 infs=1 bkbs=6 Sanger:RPi Plan 9 Install JamesChoate$Use the raw disk device (it has no buffering) so it will go much faster.
sudo dd bs=1m if=9pi.img of=/dev/rdisk3This took a lot less time than expected, the Plan 9 image isn't that big. Start: 01:12 End: 01:14 The output of the above commands is ‘silent’ meaning it doesn’t give you any update while it’s processing. You can send a SIGINFO (Ctrl+t) for current status.
load: 1.04 cmd: dd 1139 uninterruptible 0.00u 0.03s 46+0 records in 45+0 records out 47185920 bytes transferred in 5.803482 secs (8130622 bytes/sec)Once complete you should be able to remove the SD card and place in the Raspberry Pi 3 and boot/install normally. When complete if the SD card auto-mounts you’ll need to unmount it before removing it.
Contgratulations, at this point you should have a working Plan 9 installation on your Raspberry Pi 3!
Bibliography and References
 Choate, James. ”A Gentle Introduction to Plan 9.” System Admin Magazine. Feb. 2004.