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SubjectCONFIG_I8042
How can we turn this option off on non-x86 and without selecting
CONFIG_EMBEDDED? It seems that as the configuration files stand,
it is impossible to deselect this option:

config SERIO_I8042
tristate "i8042 PC Keyboard controller" if EMBEDDED || !X86
default y
select SERIO

It seems that in menuconfig, it isn't possible to change this option
either:

x x --- Serial i/o support x x
x x --- i8042 PC Keyboard controller x x
x x <M> Serial port line discipline x x

Maybe "!X86" doesn't mean "not X86 architectures" when it isn't
defined?

This means that all architectures which do not support 8042 get
8042 support forced in them. In my case, this is the result:

Unable to handle kernel NULL pointer dereference at virtual address 00000064
pgd = c0204000
[00000064] *pgd=00000000
Internal error: Oops: c0207005 [#1]
CPU: 0
PC is at i8042_flush+0x20/0x58
LR is at i8042_controller_init+0x14/0x168
pc : [<c0330fc8>] lr : [<c02159cc>] Not tainted
sp : c01e1f84 ip : 00000064 fp : c01e1f90
r10: 00000000 r9 : 00000000 r8 : 00000000
r7 : c021bee4 r6 : 00000000 r5 : c021bec0 r4 : c01e0000
r3 : a0000093 r2 : 0000000c r1 : a0000013 r0 : 00000000
Flags: NzCv IRQs off FIQs on Mode SVC_32 Segment kernel
Control: C020717F Table: C020717F DAC: 0000001D
Process swapper (pid: 1, stack limit = 0xc01e00ec)
Stack: (0xc01e1f84 to 0xc01e2000)
1f80: c01e1fa8 c01e1f94 c02159cc c0330fb4 00000000 c01e0000 c01e1fc4
1fa0: c01e1fac c021606c c02159c4 c01e0000 c021bec0 00000000 c01e1fe4 c01e1fc8
1fc0: c0208774 c0216024 00000000 00000000 00000000 00000000 c01e1ff4 c01e1fe8
1fe0: c021c0a0 c0208738 00000000 c01e1ff8 c023ae48 c021c084 5a5a5a5a 5a5a5a5a
Backtrace:
[<c0330fa8>] (i8042_flush+0x0/0x58) from [<c02159cc>] (i8042_controller_init+0x14/0x168)
[<c02159b8>] (i8042_controller_init+0x0/0x168) from [<c021606c>] (i8042_init+0x54/0x1ac)
[<c0216018>] (i8042_init+0x0/0x1ac) from [<c0208774>] (do_initcalls+0x48/0xb8)
[<c020872c>] (do_initcalls+0x0/0xb8) from [<c021c0a0>] (init+0x28/0xc8)
[<c021c078>] (init+0x0/0xc8) from [<c023ae48>] (do_exit+0x0/0x398)
Code: e10f1000 e3813080 e121f003 e3a0c064 (e5dc3000)
0>Kernel panic: Attempted to kill init!

--
Russell King (rmk@arm.linux.org.uk) http://www.arm.linux.org.uk/personal/
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core
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