From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <697245ae9209547ae2c4c9a3c3690351@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Tue, 12 Jun 2018 11:16:42 +0100
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Subject: [9fans] raspberry pi kernel update
Topicbox-Message-UUID: d7066a12-ead9-11e9-9d60-3106f5b1d025

I've made an update to the rpi 2 & 3 kernel source (armv7.s and rebootcode.s
in /n/sources/contrib/miller/9/bcm) to correct a couple of long-standing
flaws in the multicore startup:

- dependency on the order of object files for the 5l command in the mkfile,
  resulting in "lock loop" or "only 1 cpu started" error for some configurations
- flakiness in /dev/reboot, making it unreliable except with *ncpu=1

It should now be possible consistently to reboot a pi in multicore mode from
a named file using the 'reboot' or 'fshalt -r' command.  This extends the
possibilities for using the Plan 9 kernel itself as a boot loader (with an rc
script as /boot/boot), eg to load a kernel from an AoE server or over wifi.