resume Birch
https://source.puri.sm/Librem5/use-cases/issues/75
This is about testing on linux-next after 5.5-rc2 (ongoing); and with mainline ATF in u-boot.
unlike on the devkit, on Birch the system won't resume (the console should do it, but i've set the volume buttons to wakeup-sources just in case)
[ 63.173700] Disabling non-boot CPUs ...
[ 63.178945] device: 'index0': device_unregister
[ 63.183857] device: 'index1': device_unregister
[ 63.188775] device: 'index2': device_unregister
[ 63.193771] device: 'cache': device_unregister
[ 63.200449] CPU1: shutdown
[ 63.203373] psci: CPU1 killed (polled 0 ms)
[ 63.217185] device: 'index0': device_unregister
[ 63.222041] device: 'index1': device_unregister
[ 63.226868] device: 'index2': device_unregister
[ 63.231697] device: 'cache': device_unregister
[ 63.238389] CPU2: shutdown
[ 63.241166] psci: CPU2 killed (polled 0 ms)
[ 63.255455] device: 'index0': device_unregister
[ 63.260326] device: 'index1': device_unregister
[ 63.265287] device: 'index2': device_unregister
[ 63.270156] device: 'cache': device_unregister
[ 63.277005] CPU3: shutdown
[ 63.280012] psci: CPU3 killed (polled 0 ms)
[ 63.296854] Checking wakeup interrupts