3 Sep
2021
3 Sep
'21
12:41 a.m.
On Thu, Aug 19, 2021 at 04:53:11PM +0100, Peter Hoyes wrote:
From: Peter Hoyes Peter.Hoyes@arm.com
Armv8r64 is the first Armv8 platform that only has a PMSA at the current exception level. The architecture supplement for Armv8r64 describes new fields in ID_AA64MMFR0_EL1 which can be used to detect whether a VMSA or PMSA is present. These fields are RES0 on Armv8a.
Add logic to read these fields and, for the protection of the memory used by U-Boot, initialize the MPU instead of the MMU during init, then clear the MPU regions before transition to the next stage.
Provide a default (blank) MPU memory map, which can be overridden by board configurations.
Signed-off-by: Peter Hoyes Peter.Hoyes@arm.com
Applied to u-boot/next, thanks!
--
Tom