mips: add a option to support not reserving malloc space on initial stack
The initial stack on some platforms is too small to hold a large malloc
space. This patch adds a option to allow these platforms not reserving the
malloc space on initial stack. These platforms should set the malloc base
after DRAM is usable.
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f7439c4..7b9d007 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -317,6 +317,24 @@
help
The exception vector base to be restored before booting linux kernel
+config INIT_STACK_WITHOUT_MALLOC_F
+ bool "Do not reserve malloc space on initial stack"
+ default n
+ help
+ Enable this option if you don't want to reserve malloc space on
+ initial stack. This is useful if the initial stack can't hold large
+ malloc space. Platform should set the malloc_base later when DRAM is
+ ready to use.
+
+config SPL_INIT_STACK_WITHOUT_MALLOC_F
+ bool "Do not reserve malloc space on initial stack in SPL"
+ default n
+ help
+ Enable this option if you don't want to reserve malloc space on
+ initial stack. This is useful if the initial stack can't hold large
+ malloc space. Platform should set the malloc_base later when DRAM is
+ ready to use.
+
config SPL_LOADER_SUPPORT
bool
default n
diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S
index dd93df9..6de9a2f 100644
--- a/arch/mips/cpu/start.S
+++ b/arch/mips/cpu/start.S
@@ -59,7 +59,8 @@
sp, sp, GD_SIZE # reserve space for gd
and sp, sp, t0 # force 16 byte alignment
move k0, sp # save gd pointer
-#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
+ !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
li t2, CONFIG_VAL(SYS_MALLOC_F_LEN)
PTR_SUBU \
sp, sp, t2 # reserve space for early malloc
@@ -75,7 +76,8 @@
blt t0, t1, 1b
nop
-#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) && \
+ !CONFIG_IS_ENABLED(INIT_STACK_WITHOUT_MALLOC_F)
PTR_S sp, GD_MALLOC_BASE(k0) # gd->malloc_base offset
#endif
.endm