On 09/16/2014 11:30 PM, Tony Lindgren wrote:
> Found one more issue when booting on 2420 n8x0, maybe something to do
> with runtime PM?
To some degree, yes.
> [ 4.770507] Internal error: Oops - undefined instruction: 0 [#1]
SMP ARM
e3a02000 mov r2, #0
ee072fba mcr 15, 0, r2, cr7, cr10, {5}
e3a01001 mov r1, #1
f5d3f000 pld [r3]
=>e1d30f9f ldrexb r0, [r3]
That ldrexb is part of the xchg() function in serial8250_rpm_get_tx().
So it looks like 2420 n8x0 does not understand ldrexb but the inline
assembly decided that it should.
This OMAP2420 should be ARM1136 / ARMv6. The ARM1136J(F)-S TRM says for
ldrexb: "This command is only available from the rev1 (r1p0) release of
the ARM1136JF-S processor."
So it looks like the CPU should know what to do when this opcode comes
around.
>
> Regards,
>
> Tony
>
Sebastian
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