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mips: add an option to support initialize SRAM for initial stack

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Currently CONFIG_MIPS_INIT_STACK_IN_SRAM assumes the memory space for the
initial stack can be used directly. However on some platform the SRAM needs
initialization, e.g. lock cache.

This patch adds an option to allow a new function mips_sram_init() being
called before setup_stack_gd.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2020-04-21 09:28:27 +02:00 committed by Daniel Schwierzeck
parent aba6e77a30
commit 2434f58c78
2 changed files with 16 additions and 0 deletions
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9
arch/mips/Kconfig
View File

@ -425,6 +425,15 @@ config MIPS_INIT_STACK_IN_SRAM
lowlevel_init. Thus lowlevel_init does not need to be implemented
in assembler.
config MIPS_SRAM_INIT
bool
default n
depends on MIPS_INIT_STACK_IN_SRAM
help
Select this if the SRAM for initial stack needs to be initialized
before it can be used. If enabled, a function mips_sram_init() will
be called just before setup_stack_gd.
config SYS_DCACHE_SIZE
int
default 0

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

@ -217,6 +217,13 @@ wr_done:
#endif
#ifdef CONFIG_MIPS_INIT_STACK_IN_SRAM
#ifdef CONFIG_MIPS_SRAM_INIT
/* Initialize the SRAM first */
PTR_LA t9, mips_sram_init
jalr t9
nop
#endif
/* Set up initial stack and global data */
setup_stack_gd