22 Dec
2011
22 Dec
'11
12:39 p.m.
On Thu, Dec 22, 2011 at 10:09:30AM +0100, Michal Simek wrote:
Stefan Kristiansson wrote:
+void dcache_enable(void) +{
- mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_DCE);
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
- asm volatile("l.nop");
This is interesting. Are there 8 nops? Is there any reason for that? Is it just any waiting? If yes, maybe it will be worth to add any comment.
Yes, the number of nops are kind of arbitrary, they are there to add some headroom for the cache to startup without any load/stores in flight.
But you are right, a comment about this might be in place.
Stefan