19 Oct
2015
19 Oct
'15
10:27 a.m.
Hello Thomas,
On Mon, 19 Oct 2015 16:18:06 +0800, Thomas Chou thomas@wytron.com.tw wrote:
Hi Albert,
On 10/19/2015 01:52 PM, Albert ARIBAUD wrote:
Not sure I'm getting this, so for my own education: what prevents from invalidating the cache, or IOW, what would happen if it was invalidated at this point rather than flushed?
This is a hardware limitation. The nios2 cpu with 4 bytes dcache line size does not support the initda instruction, which is needed to invalidate dcache.
Recently we added a check, if the nios2 cpu support initda instruction, then we use invalidate_dcache, otherwise we use flush_dcache.
Now I understand. Thanks!
Best regards, Thomas
Amicalement,
--
Albert.