spl: introduce SPL_XIP to config
U-Boot and SPL don't necessary share the same location, so we might end
with U-Boot SPL in read-only memory (XIP) and U-Boot in read-write memory.
In case of non XIP boot mode, we rely on such variables as "hart_lottery"
and "available_harts_lock" which we use as atomics.
The problem is that CONFIG_XIP also propagate to main U-Boot, not only SPL,
so we need CONFIG_SPL_XIP to distinguish SPL XIP from other XIP modes.
This adds an option special for SPL to behave it in XIP manner and we don't
use hart_lottery and available_harts_lock, during start proccess.
Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 78e964d..c042506 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -269,6 +269,13 @@
from a NOR flash memory without copying the code to ram.
Say yes here if U-Boot boots from flash directly.
+config SPL_XIP
+ bool "Enable XIP mode for SPL"
+ help
+ If SPL starts in read-only memory (XIP for example) then we shouldn't
+ rely on lock variables (for example hart_lottery and available_harts_lock),
+ this affects only SPL, other stages should proceed as non-XIP.
+
config SHOW_REGS
bool "Show registers on unhandled exception"