iMX8 not all cores starting

[Duss Pirmin]

Hi Genodians

As mentioned in an earlier mail I'm currently enabling base-hw on the
IoT gateway of CompuLab [1].

The used SoC is a iMX8mm, which is a bit different from the iMX8mq used
on the EVK [2].

On a running Linux I used `memtool` to read register values.

In `src/bootstrap/spec/iot_gateway/platform.cc` I have changed the
following things:
 - the values for the `regulator` registers
 - the register offsets and values for the ARM_PLL registers
 - the values of the IOMUX configuration

Now the code bootstrap finishes and the kernel begins to run.
By adding some `Genode::raw()`s to `void kernel_init()` I'm able to see,
that the initialization for kernel waits for all CPUs to start at `while
(!pool_ready) { ; }`.

If change `NR_OF_CPUS` to 1, I'm able to run the log run script.

log output of IoT gateway [1]:

```
Kernel: Board()  ::  324
Kernel: Board()  ::  342
Kernel: wake_up_all_cpus()  ::  352  ---  1
Kernel: wake_up_all_cpus()  ::  352  ---  2
Kernel: wake_up_all_cpus()  ::  352  ---  3

Kernel: kernel_init()  ::  56
Kernel: initialize()  ::  184
Kernel: initialize()  ::  186   ---   0
Kernel: initialize()  ::  188   ---   0   initialized=4

```

log output from EVK [2]:

```
Kernel: kernel_init()  ::  56

Kernel: initialize()  ::  186   ---   0
Kernel: initialize()  ::  188   ---   0   initialized=4
Kernel: initialize()  ::  184
Kernel: initialize()  ::  186   ---   3
Kernel: initialize()  ::  188   ---   3   initialized=3
Kernel: initialize()  ::  184
Kernel: initialize()  ::  186   ---   2
Kernel: initialize()  ::  188   ---   2   initialized=2
Kernel: initialize()  ::  184
Kernel: initialize()  ::  186   ---   1
Kernel: initialize()  ::  188   ---   1   initialized=1

kernel initialized

```

Has anybody an idea what registers could have an influence on the start
up of the CPUs?

[1]
https://www.compulab.com/products/iot-gateways/iot-gate-imx8-industrial-arm-iot-gateway/

[2]
https://www.nxp.com/design/development-boards/i-mx-evaluation-and-development-boards/evaluation-kit-for-the-i-mx-8m-applications-processor:MCIMX8M-EVK

Best regards,
Pirmin

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