Install Linux 5.x to NanoPi M4

Source code
https://github.com/heiher/linux/tree/nanopi-m4

git clone -b nanopi-m4 https://github.com/heiher/linux

Install prebuilt

git clone --depth 1 https://github.com/heiher/kernel-nanopi-m4
cd kernel-nanopi-m4
 
./generate.sh /dev/mmcblk0
 
sudo dd if=output/boot/param.img of=/dev/mmcblk0 bs=1M seek=4
sudo dd if=output/boot/kernel.img of=/dev/mmcblk0 bs=1M seek=32
sudo dd if=output/boot/resource.img of=/dev/mmcblk0 bs=1M seek=20
sudo cp -a output/modules/* /lib/modules/
sudo chown -R root:root /lib/modules

Additional patches
* arm64: rk3399: increase CPU frequency during early boot

This is a workaround to fix the following issues. The right way should
be to increase frequency of CPU before boot linux kernel in bootloader.

[   92.165850] watchdog: BUG: soft lockup - CPU#4 stuck for 22s! [swapper/0:1]
[   92.166643] Modules linked in:
[   92.167463] CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.5.10-ARCH #1
[   92.168025] Hardware name: FriendlyElec NanoPi M4 (DT)
[   92.168672] pstate: 20000005 (nzCv daif -PAN -UAO)
[   92.169504] pc : trace_event_eval_update+0xfc/0x348
[   92.170164] lr : trace_event_eval_update+0x144/0x348
[   92.170652] sp : ffff80001004bcf0
[   92.171112] x29: ffff80001004bcf0 x28: 0000000000000001
[   92.171834] x27: ffff8000118d2228 x26: ffff8000111710b0
[   92.172502] x25: ffff80001180db98 x24: 000000000000000e
[   92.173134] x23: ffff800011746428 x22: 00000000000000ec
[   92.173749] x21: 0000000000000264 x20: 0000000000000158
[   92.174352] x19: ffff8000118bc778 x18: 0000000000000001
[   92.174951] x17: 00000000ed34b782 x16: 00000000d54c3662
[   92.175549] x15: 2d20377b1910031c x14: ff00000000000000
[   92.176140] x13: 0000000000000000 x12: 0000000000000007
[   92.176731] x11: 0101010101010101 x10: 0000000000000005
[   92.177322] x9 : 0000000000000003 x8 : 0000000000000008
[   92.177922] x7 : 1c0310197b37202d x6 : 2d20377b1910031c
[   92.178506] x5 : 0000000000000000 x4 : 000000000000000e
[   92.179085] x3 : ffff8000118bbbee x2 : 0000000000000045
[   92.179671] x1 : 000000000000002c x0 : 0000000000000000
[   92.180263] Call trace:
[   92.180921]  trace_event_eval_update+0xfc/0x348
[   92.181652]  tracer_init_tracefs+0x160/0x1e8
[   92.182304]  do_one_initcall+0x4c/0x218
[   92.182949]  kernel_init_freeable+0x1d0/0x240
[   92.183652]  kernel_init+0x18/0x104
[   92.184245]  ret_from_fork+0x10/0x18

[  133.872912] cpufreq: cpufreq_online: CPU4: Running at unlisted freq: 12000 KHz
[  133.891606] cpufreq: cpufreq_online: CPU4: Unlisted initial frequency changed to: 408000 KHz

Over!

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