On 4 April 2015 at 00:52, Tony Lindgren <tony@xxxxxxxxxxx> wrote: > Right, it affects n900 for sure. My point is that it also seems to > affect 37xx versions not listed to suffer from this issue. They shouldn't... erratum 430973 only affected Cortex-A8 r1, and the dm37xx should have an r3p2 right? A word of caution though: at least on the DM814x and AM335x, secure ROM sets bit 6 (IBE) in the Auxiliary Control Register, thereby enabling BTB invalidate instructions (which normally execute as nops). This is presumably a leftover of the erratum 430973 workaround, but it means there is a risk of running afoul of erratum 687067 if BTB invalidate by MVA instructions are actually used. I would actually suggest clearing IBE if it set on Cortex-A8 r2 or later processors and a secure monitor call is available to do so (there is on the DM814x and AM335x, dunno about the 37xx), also for performance reasons: BTB invalidates are quite expensive instructions (when enabled). Matthijs -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
