Re: [PATCH 20/31] nds32: L2 cache support

2017-11-08 17:48 GMT+08:00 Arnd Bergmann [off-list ref]:

On Wed, Nov 8, 2017 at 6:55 AM, Greentime Hu [off-list ref] wrote:

quoted

From: Greentime Hu <redacted>

Signed-off-by: Vincent Chen <redacted>
Signed-off-by: Greentime Hu <redacted>

quoted

+
+/* This is defined for head.S to use due to device tree is not yet built. */
+#define L2CC_PA_BASE           0x90F00000

This looks problematic, since it prevents you from using the same head.S for
multiple SoCs that have different L2 controllers or that have them at different
addresses.

What does head.S actually do to the L2CC? Could the boot protocol require
that to be done by the boot loader before entering the kernel instead?

Thanks.
It will disable and invalidate L2 cache. I think we can do these
things in bootloader.
I will refine it in the next version patch.