MIPS: add possibility to setup initial stack and global data in SRAM
This adds a new Kconfig option CONFIG_MIPS_INIT_STACK_IN_SRAM which
a SoC can select if it supports some kind of SRAM. Together with
CONFIG_SYS_INIT_SP_ADDR the initial stack and global data can be
set up in that SRAM. This can be used to provide a C environment
also for lowlevel_init().
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 709ac5c..d97930e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -302,6 +302,17 @@
config SYS_MIPS_CACHE_INIT_RAM_LOAD
bool
+config MIPS_INIT_STACK_IN_SRAM
+ bool
+ default n
+ help
+ Select this if the initial stack frame could be setup in SRAM.
+ Normally the initial stack frame is set up in DRAM which is often
+ only available after lowlevel_init. With this option the initial
+ stack frame and the early C environment is set up before
+ lowlevel_init. Thus lowlevel_init does not need to be implemented
+ in assembler.
+
config SYS_DCACHE_SIZE
int
default 0