[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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Compiling r15355-19d7e73ecc with that CONFIG_CMDLINE_OVERRIDE=y reverted fixes R7800.

* sysupgrade to work ok. Downgrade to r15254 worked.
* serial console works again.

Fixed bootlog:


[    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
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 474836K/491520K available (6042K kernel code, 193K rwdata, 1528K rodata, 1024K init, 231K bss, 16684K reserved, 0K cma-reserved, 0K highmem)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1



Note that also these lines that appeared on the faulty build, have disappeared:

[    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




Fix applied:


--- a/target/linux/ipq806x/config-5.4
+++ b/target/linux/ipq806x/config-5.4
@@ -78,7 +78,7 @@ CONFIG_CC_HAS_KASAN_GENERIC=y
 CONFIG_CLKDEV_LOOKUP=y
 CONFIG_CLKSRC_QCOM=y
 CONFIG_CLONE_BACKWARDS=y
-CONFIG_CMDLINE_OVERRIDE=y
+# CONFIG_CMDLINE_OVERRIDE is not set
 CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_QCOM=y
 CONFIG_COMPAT_32BIT_TIME=y


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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3540#comment9219

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