From de34a61642eda0b64b34dd4d9eeda57eb01f76bc Mon Sep 17 00:00:00 2001 From: Stefan Roese <sr@denx.de> Date: Tue, 30 Jun 2020 12:33:16 +0200 Subject: [PATCH] mips: Add CONFIG_MIPS_MACH_EARLY_INIT for very early mach init code 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> --- 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 eb00ee71bc..652e6a993e 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -270,6 +270,15 @@ 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 "Allow generic start 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 e22771715c..d0c412236d 100644 --- a/arch/mips/cpu/start.S +++ b/arch/mips/cpu/start.S @@ -236,6 +236,11 @@ wr_done: # endif #endif +#ifdef CONFIG_MIPS_MACH_EARLY_INIT + bal mips_mach_early_init + nop +#endif + #ifdef CONFIG_MIPS_CACHE_SETUP /* Initialize caches... */ PTR_LA t9, mips_cache_reset -- 2.39.5