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MIPS: add possibility to setup initial stack and global data in SRAM

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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>
This commit is contained in:
Daniel Schwierzeck 2016-06-04 16:13:21 +02:00
parent c3e72ab801
commit 924ad86638
2 changed files with 18 additions and 0 deletions
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11
arch/mips/Kconfig
View file

@ -302,6 +302,17 @@ config SWAP_IO_SPACE
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

7
arch/mips/cpu/start.S
View file

@ -234,6 +234,11 @@ wr_done:
nop
#endif
#ifdef CONFIG_MIPS_INIT_STACK_IN_SRAM
/* Set up initial stack and global data */
setup_stack_gd
#endif
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
# ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
/* Initialize any external memory */
@ -255,8 +260,10 @@ wr_done:
# endif
#endif
#ifndef CONFIG_MIPS_INIT_STACK_IN_SRAM
/* Set up initial stack and global data */
setup_stack_gd
#endif
move a0, zero # a0 <-- boot_flags = 0
PTR_LA t9, board_init_f