Am 18.07.2018 um 09:27 schrieb Giorgio Dal Molin:
> Hi all,
> 
> I'm currently working with the imx7d sabre board from NXP.
> 
> I have now a running barebox bootloader and a booting kernel.
> 
> My problem is now that, apparently, only one core is active:
> 
> ...
> commandline: console=ttymxc0,115200n8 ip=11.0.0.4::11.0.0.2:255.0.0.0::eth0: root=/dev/mmcblk0p2 rootdelay=1
> Starting kernel in secure mode
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 4.17.7 (giorgio@BV_blfs) (gcc version 8.1.0 (OSELAS.Toolchain-2018.02.0)) #1 SMP Wed Jul 18 07:44:41 CEST 2018
> [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
> [    0.000000] CPU: div instructions available: patching division code
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
> [    0.000000] OF: fdt: Machine model: Freescale i.MX7 SabreSD Board
> [    0.000000] Memory policy: Data cache writealloc
> [    0.000000] cma: Reserved 64 MiB at 0xba000000
> [    0.000000] percpu: Embedded 14 pages/cpu @(ptrval) s36392 r0 d20952 u57344
> [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 260608
> [    0.000000] Kernel command line: console=ttymxc0,115200n8 ip=11.0.0.4::11.0.0.2:255.0.0.0::eth0: root=/dev/mmcblk0p2 rootdelay=1
> [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> [    0.000000] Memory: 950804K/1048576K available (10240K kernel code, 450K rwdata, 2188K rodata, 1024K init, 7788K bss, 32236K reserved, 65536K cma-reserved, 196196K highmem)
> [    0.000000] Virtual kernel memory layout:
> [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
> [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
> [    0.000000]     vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
> [    0.000000]     lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
> [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
> [    0.000000]       .text : 0x(ptrval) - 0x(ptrval)   (11232 kB)
> [    0.000000]       .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
> [    0.000000]       .data : 0x(ptrval) - 0x(ptrval)   ( 451 kB)
> [    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   (7789 kB)
> [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
> [    0.000000] Running RCU self tests
> [    0.000000] Hierarchical RCU implementation.
> [    0.000000]  RCU event tracing is enabled.
> [    0.000000]  RCU lockdep checking is enabled.
> [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
> [    0.000000]  Offload RCU callbacks from CPUs: (none).
> [    0.000000] arch_timer: cp15 timer(s) running at 8.00MHz (virt).
> [    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 440795202120 ns
> [    0.000009] sched_clock: 56 bits at 8MHz, resolution 125ns, wraps every 2199023255500ns
> [    0.000033] Switching to timer-based delay loop, resolution 125ns
> [    0.000545] Switching to timer-based delay loop, resolution 41ns
> [    0.000574] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
> [    0.000601] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
> [    0.001981] Console: colour dummy device 80x30
> [    0.002013] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> [    0.002032] ... MAX_LOCKDEP_SUBCLASSES:  8
> [    0.002050] ... MAX_LOCK_DEPTH:          48
> [    0.002068] ... MAX_LOCKDEP_KEYS:        8191
> [    0.002086] ... CLASSHASH_SIZE:          4096
> [    0.002104] ... MAX_LOCKDEP_ENTRIES:     32768
> [    0.002122] ... MAX_LOCKDEP_CHAINS:      65536
> [    0.002140] ... CHAINHASH_SIZE:          32768
> [    0.002158]  memory used by lock dependency info: 4655 kB
> [    0.002176]  per task-struct memory footprint: 1536 bytes
> [    0.002230] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
> [    0.002264] pid_max: default: 32768 minimum: 301
> [    0.002590] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
> [    0.002622] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
> [    0.004407] CPU: Testing write buffer coherency: ok
> [    0.005308] CPU0: update cpu_capacity 1024
> [    0.005335] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
> [    0.006792] Setting up static identity map for 0x80100000 - 0x80100060
> [    0.007218] Hierarchical SRCU implementation.
> [    0.008853] smp: Bringing up secondary CPUs ...
> [    0.010740] smp: Brought up 1 node, 1 CPU
> [    0.010766] SMP: Total of 1 processors activated (48.00 BogoMIPS).
> [    0.010786] CPU: All CPU(s) started in SVC mode.
> [    0.012748] devtmpfs: initialized
> ...
> 
> I was expecting both cores to be enabled at least by the kernel.
> 
> Does anyone had the same problem ?

Yea, I have same problem, but no time to investigate it.
@Lukas, do you know any thing about it?

-- 
Regards,
Oleksij