On Mon, 2011-11-28 at 16:29 +0000, Dave Martin wrote:

quoted

+config ARCH_VEXPRESS_V2P_CA5S_CA9
+	bool "CoreTile Express A5x2 and A9x4 based platform support"
+	select ARCH_VEXPRESS_RS1
+	select ARCH_VEXPRESS_DT

Shouldn't we depend on CPU_V7, ARM_GIC and CACHE_PL310 here?  I get a lot of
moaning from Kconfig about unmet dependencies.  I think the coretiles do have
a CPU etc. on them... 

CPU_V7 and ARM_GIC - definitely, thanks for spotting that.

CACHE_PL310 - I don't think so, as it's just a special case of
CACHE_L2X0, which is optional. The tile works fine with the L2 cache
disabled.

quoted

+	select ARM_ERRATA_720789
+	select ARM_ERRATA_751472

The workarounds for these errata both erroneously depend on CONFIG_SMP; however,
I don't think that's a bug in these patches -- selecting those options here
feels correct.

Yes, I've just mirrored what the ARCH_VEXPRESS_CA9X4 selects.

quoted

+	select ARM_ERRATA_753970

Will has a patch, now in Russell's fixes branch, which renames this to
PL310_ERRATA_753970 for compatibility with other people's patches. 
This erratum workaround depends on CACHE_PL310, but since the PL310 is
a property of the CoreTile which must be configured in, that dependency
seems reasonable.

As the PL310 is optional I think I'll just do:

        select PL310_ERRATA_753970 if CACHE_PL310

Cheers!

Pawel