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arm: Allow skipping of low-level init with I-cache on

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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>
This commit is contained in:
Simon Glass
2016-05-05 07:28:06 -06:00
committed by Andreas Bießmann
parent 9095846655
commit b5bd09820c
7 changed files with 19 additions and 2 deletions
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README
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@@ -4824,6 +4824,11 @@ Low Level (hardware related) configuration options:
other boot loader or by a debugger which performs
these initializations itself.
- CONFIG_SKIP_LOWLEVEL_INIT_ONLY
[ARM926EJ-S only] This allows just the call to lowlevel_init()
to be skipped. The normal CPU15 init (such as enabling the
instruction cache) is still performed.
- CONFIG_SPL_BUILD
Modifies the behaviour of start.S when compiling a loader
that is executed before the actual U-Boot. E.g. when