On 07/10/13 18:37, Victor Kamensky wrote:
On 7 October 2013 08:57, Ben Dooksben.dooks@codethink.co.uk wrote:
On 07/10/13 17:48, Victor Kamensky wrote:
Hi Will, Ben, Russell, Thomas,
Please review second version of patch that fixes TLB asid issue in big endian V7 image.
Changes from v1: Note previous patch subject line was 'ARM: tlb: __flush_tlb_mm need to use int asid var for BE correct operation'
Added 'unsigned int' cast into ASID macro itself rather then use intermediate 'int' variable in __flush_tlb_mm function. This is done per v1 patch discussion athttp://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/202583.ht...
Tested with Linaro BE topic branch on Arndale board. Both LE and BE images were tested.
If you are booting on the Arndale board, is there a patch to mark the relevant Exynos devices as BE capable?
Arndale need massive fixes in their BSP layer to be endian agnostic ARM V7 platform. Unfortunate it is not as simple as with few others that already marked as BE capable.
Please see https://git.linaro.org/gitweb?p=people/victor.kamensky/linux-linaro-tracking... Mostly it is __raw_xxx conversion to xxx_relaxed, but there are more subtle changes (some of them similar to changs that you've done for other platforms). Also there are known unfixed issues like disabling CONFIG_MMC_DW_IDMAC config because idmac DMA related code is not endian agnostic yet (btw interesting class of BE related problem that was not seen before).
Ok, will have a look. I'm interested as I may be able to update my techcon paper and possibly insert a slide or two.
In Linaro we use Arndale and Pandaboard as reference platforms therefore we have BE BSP fixes in our tree. But I am not sure what is fate of those in long term. Also we consider these as example of BSP changes that other BSP need to do.
If Exynos and OMAP owners will have any interest for BE images, and would like to see these changes in main line, we gladly will work on this. Otherwise changes like this can mess up with BSP ongoing drivers development.
I think above position is consistent with similar discussion on some of BE related threads - changing BSP to support BE mode is BSP owners call.
I'm not sure if it will ever be interesting to OMAP, especially as it is pretty much a dead-end.
It would be nice to see the Exynos support it.