5:26 p.m.
Hello guys,
I need to write some data directly to main memory, without the risk that
some parts remain into caches. Is there a way to invalidate caches with an
ASM instruction? Or to set a space as uncacheable? Unfortunately, I cannot
map ddr into I/O space as you do for copying bbl from sdcard to main memory.
Thank you so much,
Francesco
--
| Francesco Viggiano, Columbia University, Staff associate researcher at
Computer Science Building |
| Phone: +1 646-9829-535, Skype ID: francesco.vgg |
| Department of Computer Science 1214 Amsterdam Avenue |
| Columbia University Mail Code 0401 | New York, NY 10027-7003 |
5:37 p.m.
As far as I can tell, No.
This was the reason to use the remap method in untether-v0.2.
It is still impossible to do in debug-v0.3.
It might be possible though some hardware hack that allows direct write
through the IO side, but then L1/2 cache is endangered to have dirty
data out-of-sync.
-Wei
On 25/07/16 22:26, Francesco Viggiano wrote:
Hello guys,
I need to write some data directly to main memory, without the risk that
some parts remain into caches. Is there a way to invalidate caches with an
ASM instruction? Or to set a space as uncacheable? Unfortunately, I cannot
map ddr into I/O space as you do for copying bbl from sdcard to main memory.
Thank you so much,
Francesco
6:36 p.m.
Thank you Wei.
On Mon, Jul 25, 2016 at 5:37 PM Wei Song <ws327(a)cam.ac.uk> wrote:
As far as I can tell, No.
This was the reason to use the remap method in untether-v0.2.
It is still impossible to do in debug-v0.3.
It might be possible though some hardware hack that allows direct write
through the IO side, but then L1/2 cache is endangered to have dirty
data out-of-sync.
-Wei
On 25/07/16 22:26, Francesco Viggiano wrote:
> Hello guys,
>
> I need to write some data directly to main memory, without the risk that
> some parts remain into caches. Is there a way to invalidate caches with
an
> ASM instruction? Or to set a space as uncacheable? Unfortunately, I
cannot
> map ddr into I/O space as you do for copying bbl from sdcard to main
memory.
>
> Thank you so much,
>
> Francesco
--
| Francesco Viggiano, Columbia University, Staff associate researcher at
Computer Science Building |
| Phone: +1 646-9829-535, Skype ID: francesco.vgg |
| Department of Computer Science 1214 Amsterdam Avenue |
| Columbia University Mail Code 0401 | New York, NY 10027-7003 |
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Wei Song