8 Jul
2009
8 Jul
'09
5:46 p.m.
On Wed, Jul 08, 2009 at 11:23:15AM -0300, Alemao wrote:
In cpu/mpc83xx/start.S, dcache is enable for stack-in-cache trick:
/* enable and invalidate the data cache */ bl dcache_enable sync
dcache_enable: mfspr r3, HID0 li r5, HID0_DCFI|HID0_DLOCK andc r3, r3, r5 mtspr HID0, r3 /* no invalidate, unlock */ ori r3, r3, HID0_DCE ori r5, r3, HID0_DCFI mtspr HID0, r5 /* enable + invalidate */ mtspr HID0, r3 /* enable */ sync blr
I didn't find any code that is disabling it after that.
Did you find anything that unlocks it once the stack-in-cache is no longer needed? If not, it will not be usable as a cache, just as a RAM.
-Scott