bootloader firmware needs update to get vchiq working with 4.2

[Victor Mayoral]

Just putting together a demo with the newer Rpi2 Snappy image (4.2 kernel) and bumped into (this did not happen with the previous kernel):

[ 3.083682] vchiq: vchiq_init_state: slot_zero = 0xb5c80000, is_master = 0
[ 3.093381] bcm2835_vchiq 3f00b840.vchiq: failed to set channelbase
[ 3.102039] vchiq: could not load vchiq
[ 3.107878] bcm2835_vchiq: probe of 3f00b840.vchiq failed with error -1271651840

According to https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=120977 an update on the "firmware" (https://github.com/raspberrypi/firmware) fixes this issue however this repo contains a different kernel and modules than the one shipped. Will try modifying /opt/vc for now.

[Victor Mayoral (vmayoral)]

In case it's not obvious, the result of the issue reported above is that /dev/vchiq is not exposed thereby the camera can't be accessed.

[Renat (renat2017)]

Can confirm that still doesn't work. Upgrading firmware using rpi-update helped.

[Viktor Petersson (vpetersson)]

Any update on this, guys?

[Oliver Grawert (ogra)]

it is next on my TODO, there are some more urgent things first though

[Renat (renat2017)]

Replacing start.elf and fixup.elf from the https://github.com/raspberrypi/firmware "next" branch fixed this issue.

[Oliver Grawert (ogra)]

the pi2 snap in the store has been updated with the latest stable firmware:

(RaspberryPi2)ubuntu@localhost:~$ ls -l /dev/vchiq
crw------- 1 root root 245, 0 Feb 5 17:35 /dev/vchiq

i will set this bug to "Fix Released" state once we had the next 15.04 stable release with this new pi2 snap included (unlike in 16.04 the bootloader does not get updated in 15.04, so you need to re-flash). if you want to test it, just using ubuntu-device-flash to create a fresh img from 15.04/edge will get you the new oem snap.

[Viktor Petersson (vpetersson)]

Yay. Thanks @ogra!