From 2434f58c784e3216b7925fe00ce49c113c6a511e Mon Sep 17 00:00:00 2001 From: Weijie Gao Date: Tue, 21 Apr 2020 09:28:27 +0200 Subject: [PATCH] mips: add an option to support initialize SRAM for initial stack 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 Reviewed-by: Stefan Roese Signed-off-by: Weijie Gao --- arch/mips/Kconfig | 9 +++++++++ arch/mips/cpu/start.S | 7 +++++++ 2 files changed, 16 insertions(+) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index b76ad8c..f7439c4 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -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 diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S index 784b8be..dd93df9 100644 --- a/arch/mips/cpu/start.S +++ b/arch/mips/cpu/start.S @@ -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 -- 2.7.4