arm: Allow skipping of low-level init with I-cache on
At present CONFIG_SKIP_LOWLEVEL_INIT prevents U-Boot from calling
lowlevel_init(). This means that the instruction cache is not enabled and
the board runs very slowly.
What is really needed in many cases is to skip the call to lowlevel_init()
but still perform CP15 init. Add an option to handle this.
Reviewed-by: Heiko Schocher <hs@denx.de>
Tested-on: smartweb, corvus, taurus, axm
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/arch/arm/cpu/sa1100/start.S b/arch/arm/cpu/sa1100/start.S
index 408b70d..f5318c9 100644
--- a/arch/arm/cpu/sa1100/start.S
+++ b/arch/arm/cpu/sa1100/start.S
@@ -96,6 +96,7 @@
ldr r1, cpuspeed
str r1, [r0, #PPCR]
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY
/*
* before relocating, we have to setup RAM timing
* because memory timing is board-dependend, you will
@@ -104,6 +105,7 @@
mov ip, lr
bl lowlevel_init
mov lr, ip
+#endif
/*
* disable MMU stuff and enable I-cache