OMAP3: workaround for ARM Cortex-A8 erratum 725233
authorSiarhei Siamashka <siarhei.siamashka@gmail.com>
Wed, 24 Feb 2010 04:56:36 +0000 (23:56 -0500)
committerTom Rix <Tom.Rix@windriver.com>
Sun, 7 Mar 2010 18:36:35 +0000 (12:36 -0600)
commit041d42e789aba20296ffcde92173f100a9592880
tree33d1eed4366904e3b454538c95bb945ec95cee8b
parent7c966a8bdfdab80cafbfed035d7ae6ea6f58f756
OMAP3: workaround for ARM Cortex-A8 erratum 725233

725233: PLD instructions executed with PLD data forwarding
enabled can result in a processor deadlock

This deadlock can happen when NEON load instructions are used together
with cache preload instructions (PLD). The problematic conditions
can be triggered in-the-wild by NEON optimized functions from pixman
library (http://cgit.freedesktop.org/pixman), which perform dynamic
adjustment of prefetch distance.

The workaround disables PLD data forwarding by setting PLD_FWD bit
in L2 Cache Auxiliary Control Register as recommended in ARM Cortex-A8
errata list.

The deadlock can only happen on r1pX revisions of Cortex-A8 (used in
OMAP34xx/OMAP35xx). Performance impact of the workaround is practically
non-existant.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
cpu/arm_cortexa8/omap3/board.c