[FS#3540] ip6806x serial console is mute once kernel takes control (r15355-19d7e73ecc)

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FS#3540 - ip6806x serial console is mute once kernel takes control (r15355-19d7e73ecc)
User who did this - Hannu Nyman (hnyman)

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The faulty build r15355-19d7e73ecc sets kernel console to a non-existent tty:


Kernel command line: console=ttyHSL1,115200n8


In the previous working r15254-1302bee12a the tty is ignored:

Bootloader command line (ignored): console=ttyHSL1,115200n8


More context:
>From non-working r15355-19d7e73ecc:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.4.85 (perus at ub2010) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r15237-fca0eb2d92)) #0 SMP Sun Dec 27 19:31:27 2020
[    0.000000] CPU: ARMv7 Processor [512f04d0] revision 0 (ARMv7), cr=10c5787d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
[    0.000000] OF: fdt: Machine model: Netgear Nighthawk X4S R7800
[    0.000000] OF: fdt: Ignoring memory range 0x41500000 - 0x42000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] On node 0 totalpages: 122880
[    0.000000]   Normal zone: 1080 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 122880 pages, LIFO batch:31
[    0.000000] percpu: Embedded 15 pages/cpu s30156 r8192 d23092 u61440
[    0.000000] pcpu-alloc: s30156 r8192 d23092 u61440 alloc=15*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 121800
[    0.000000] Kernel command line: console=ttyHSL1,115200n8


>From working r15254-1302bee12a:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.4.83 (perus at ub2010) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r15237-fca0eb2d92)) #0 SMP Tue Dec 22 16:08:44 2020
[    0.000000] CPU: ARMv7 Processor [512f04d0] revision 0 (ARMv7), cr=10c5787d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
[    0.000000] OF: fdt: Machine model: Netgear Nighthawk X4S R7800
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] percpu: Embedded 15 pages/cpu s30156 r8192 d23092 u61440
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 121800
[    0.000000] Kernel command line:
[    0.000000] Bootloader command line (ignored): console=ttyHSL1,115200n8

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3540#comment9218

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