[PATCH] ARM: Fix errata 751472 handling on Cortex-A9 r1p*

[Måns Rullgård]

Catalin Marinas <catalin.marinas at arm.com> writes:

> On Thu, Nov 15, 2012 at 12:41:43PM +0000, Siarhei Siamashka wrote:
>> BTW, I always wondered about what could be preventing TI and the other
>> silicon vendors from using something like an SMC API based on
>> asymmetric cryptography? My understanding is that for OMAP4 GP chips,
>> ROM code switches to non-secure mode before passing control to the
>> bootloader and there is simply no way to workaround bugs like this.
>
> AFAIK, there are some SMCs to the OMAP secure firmware that allow such
> bits to be set (see omap4_l2x0_set_debug() for example). I'm not sure
> they are documented.

The trouble with OMAP is that the secure ROM API only allows access to a
tiny subset of the registers we'd need.  In part this can be explained
by the important OMAP customers all using the HS chips with full access
to secure mode.

-- 
Måns Rullgård
mans at mansr.com