[PATCH] ARM: Explain workaround for faulty ISAR0 register on B15

Gregory Fong gregory.0xf0 at gmail.com
Wed Aug 13 11:53:59 PDT 2014


On Mon, Aug 11, 2014 at 3:44 PM, Gregory Fong <gregory.0xf0 at gmail.com> wrote:
> The Brahma-B15 CPU design, like Krait, incorrectly indicates that it
> only supports UDIV and SDIV instructions in Thumb mode when it
> actually supports them in ARM and Thumb mode.  This is apparently
> because it follows the DDI0406B ARM ARM which has two values for the
> divide instruction field, instead of the DDI0406C ARM ARM which has
> three values.

NAK myself here. Brian Norris pointed out that this is incorrect, and
he'll send a follow-up patch to remove the forced hwcaps.  Sorry for
the noise.

Regards,
Gregory



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