This patch adds the optional call to mips_mach_early_init() to start.S at a very early stage. Its disabled per default. It can be used for very early machine / platform specific init code. Its called very early and at this stage the PC is allowed to differ from the linking address (CONFIG_TEXT_BASE) as no absolute jump has been performed until this call.
It will be used by thje Octeon platform.
Signed-off-by: Stefan Roese sr@denx.de Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com ---
(no changes since v1)
arch/mips/Kconfig | 9 +++++++++ arch/mips/cpu/start.S | 5 +++++ 2 files changed, 14 insertions(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index dd56da6dae..327fd4848a 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -296,6 +296,15 @@ config MIPS_CACHE_INDEX_BASE Normally this is CKSEG0. If the MIPS system needs to move this block to some SRAM or ScratchPad RAM, adapt this option accordingly.
+config MIPS_MACH_EARLY_INIT + bool "Enable mach specific very early init code" + help + Use this to enable the call to mips_mach_early_init() very early + from start.S. This function can be used e.g. to do some very early + CPU / SoC intitialization or image copying. Its called very early + and at this stage the PC might not match the linking address + (CONFIG_TEXT_BASE) - no absolute jump done until this call. + config MIPS_CACHE_SETUP bool "Enable startup code to initialize and setup caches" default n if SKIP_LOWLEVEL_INIT diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S index 08dddbdf5f..a7190ec3b2 100644 --- a/arch/mips/cpu/start.S +++ b/arch/mips/cpu/start.S @@ -195,6 +195,11 @@ wr_done: /* Clear timer interrupt (CP0_COUNT cleared on branch to 'reset') */ mtc0 zero, CP0_COMPARE
+#ifdef CONFIG_MIPS_MACH_EARLY_INIT + bal mips_mach_early_init + nop +#endif + #ifdef CONFIG_MIPS_CACHE_SETUP /* Disable caches */ PTR_LA t9, mips_cache_disable