A true mainline Linux Kernel for the Pinebook Pro

[xmixahlx]

so an update on the ARM erratum 1319367 situation.

A> kernel 5.5 with 1319367 disabled and maxcpus4 = boots "normally"/quickly
B> kernel 5.5 with 1319367 enabled and maxcpus4 = boots "normally"/quickly, and big cores disabled
C> kernel 5.5 with 1319367 enabled and without maxcpus4 = boots "slowly", and big cores enabled (boot takes ~30sec longer)

i am using luks with password prompt

B> dmesg | grep CPU

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Detected VIPT I-cache on CPU0
[    0.000000] CPU features: detected: ARM erratum 845719
[    0.000000] CPU features: detected: GIC system register CPU interface
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1
[    0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=6.
[    0.000000] GICv3: CPU0: found redistributor 0 region 0:0x00000000fef00000
[    0.000000] GICv3: CPU0: using allocated LPI pending table @0x00000000ee450000
[    0.129847] smp: Bringing up secondary CPUs ...
[    0.210055] Detected VIPT I-cache on CPU1
[    0.210088] GICv3: CPU1: found redistributor 1 region 0:0x00000000fef20000
[    0.210102] GICv3: CPU1: using allocated LPI pending table @0x00000000ee460000
[    0.210146] CPU1: Booted secondary processor 0x0000000001 [0x410fd034]
[    0.290112] Detected VIPT I-cache on CPU2
[    0.290135] GICv3: CPU2: found redistributor 2 region 0:0x00000000fef40000
[    0.290146] GICv3: CPU2: using allocated LPI pending table @0x00000000ee470000
[    0.290174] CPU2: Booted secondary processor 0x0000000002 [0x410fd034]
[    0.370202] Detected VIPT I-cache on CPU3
[    0.370225] GICv3: CPU3: found redistributor 3 region 0:0x00000000fef60000
[    0.370236] GICv3: CPU3: using allocated LPI pending table @0x00000000ee500000
[    0.370262] CPU3: Booted secondary processor 0x0000000003 [0x410fd034]
[    0.370378] smp: Brought up 1 node, 4 CPUs
[    0.370391] CPU features: detected: 32-bit EL0 Support
[    0.370397] CPU features: detected: CRC32 instructions
[    0.387040] CPU: All CPU(s) started at EL2
[    1.069331] kvm [1]: GIC system register CPU interface enabled
[    2.003712] cacheinfo: Unable to detect cache hierarchy for CPU 0
[    2.505357] ledtrig-cpu: registered to indicate activity on CPUs
[   19.765698] CPU features: CPU4: Detected conflict for capability 48 (ARM erratum 1319367), System: 0, CPU: 1
[   19.765913] CPU4: will not boot
[   24.790850] CPU4: failed to come online
[   24.790873] psci: CPU4 killed (polled 0 ms)
[   24.790882] CPU4: died during early boot
[   24.817137] CPU features: CPU5: Detected conflict for capability 48 (ARM erratum 1319367), System: 0, CPU: 1
[   24.817147] CPU5: will not boot
[   29.830875] CPU5: failed to come online
[   29.830898] psci: CPU5 killed (polled 0 ms)
[   29.830907] CPU5: died during early boot

C> dmesg | grep CPU

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Detected VIPT I-cache on CPU0
[    0.000000] CPU features: detected: ARM erratum 845719
[    0.000000] CPU features: detected: GIC system register CPU interface
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1
[    0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=6.
[    0.000000] GICv3: CPU0: found redistributor 0 region 0:0x00000000fef00000
[    0.000000] GICv3: CPU0: using allocated LPI pending table @0x00000000ee450000
[    0.129845] smp: Bringing up secondary CPUs ...
[    0.210053] Detected VIPT I-cache on CPU1
[    0.210086] GICv3: CPU1: found redistributor 1 region 0:0x00000000fef20000
[    0.210100] GICv3: CPU1: using allocated LPI pending table @0x00000000ee460000
[    0.210143] CPU1: Booted secondary processor 0x0000000001 [0x410fd034]
[    0.290112] Detected VIPT I-cache on CPU2
[    0.290135] GICv3: CPU2: found redistributor 2 region 0:0x00000000fef40000
[    0.290146] GICv3: CPU2: using allocated LPI pending table @0x00000000ee470000
[    0.290173] CPU2: Booted secondary processor 0x0000000002 [0x410fd034]
[    0.370198] Detected VIPT I-cache on CPU3
[    0.370221] GICv3: CPU3: found redistributor 3 region 0:0x00000000fef60000
[    0.370232] GICv3: CPU3: using allocated LPI pending table @0x00000000ee500000
[    0.370258] CPU3: Booted secondary processor 0x0000000003 [0x410fd034]
[    0.453580] CPU features: detected: ARM erratum 1319367
[    0.453881] Detected PIPT I-cache on CPU4
[    0.455126] GICv3: CPU4: found redistributor 100 region 0:0x00000000fef80000
[    0.455581] GICv3: CPU4: using allocated LPI pending table @0x00000000ee510000
[    0.456820] CPU4: Booted secondary processor 0x0000000100 [0x410fd082]
[    0.542739] Detected PIPT I-cache on CPU5
[    0.543943] GICv3: CPU5: found redistributor 101 region 0:0x00000000fefa0000
[    0.544370] GICv3: CPU5: using allocated LPI pending table @0x00000000ee520000
[    0.545480] CPU5: Booted secondary processor 0x0000000101 [0x410fd082]
[    0.550967] smp: Brought up 1 node, 6 CPUs
[    0.551045] CPU features: detected: 32-bit EL0 Support
[    0.551070] CPU features: detected: CRC32 instructions
[    0.765585] CPU: All CPU(s) started at EL2
[   30.374026] kvm [1]: GIC system register CPU interface enabled
[   33.805600] cacheinfo: Unable to detect cache hierarchy for CPU 0
[   35.821491] cpufreq: cpufreq_online: CPU4: Running at unlisted freq: 12000 KHz
[   35.843470] cpufreq: cpufreq_online: CPU4: Unlisted initial frequency changed to: 408000 KHz
[   36.056860] ledtrig-cpu: registered to indicate activity on CPUs