[U-Boot] ti, am3517: errata 430973 workaround

[Robert Nelson]

On Mon, Dec 8, 2014 at 4:19 PM, Jeroen Hofstee <jeroen at myspectrum.nl> wrote:
> Hi,
>
> A while ago [1], a RFC was posted to disable workaround for
> besides others, errata 430973. It is a bit unclear to me which
> revision actually need this workaround, but as suggested in
> [2] also enabling this workaround in Linux seem to make some
> weird problems go away in linux (signal 4, bad instruction,
> 11 segfaults etc).
>
> As said, I am a bit in doubt why this works. The board in question
> is a tam3517 derived one:
>
> cat /proc/cpuinfo
> Processor    : ARMv7 Processor rev 7 (v7l)
> BogoMIPS    : 397.57
> Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls
> CPU implementer    : 0x41
> CPU architecture: 7
> CPU variant    : 0x1
> CPU part    : 0xc08
> CPU revision    : 7
>
> Which makes this a r1p7 I assume, and hence the workaround
> of linux, CONFIG_ARM_ERRATA_430973, "This option enables the
> workaround for the 430973 Cortex-A8 (r1p0..r1p2) erratum",
> should not be needed it seems.

Digging thru my old beagle notes 430973 is also needed for "r1p3"
(dm3730/bb-xm), so that config option was never updated since the
errata was first discovered in r1p2 devices..

Fixed in r2p1 sounds about right, as i know for sure it works fine in
'r3p2' (am335x/bbb)

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/