Commit c3567d80 authored by Tom Rini's avatar Tom Rini Committed by Wolfgang Denk

README.SPL: Move the 'Estimating stack usage' from omap3 to here

The instructions are generic, so move to the generic doc.
Signed-off-by: 's avatarTom Rini <trini@ti.com>
parent f8e754d5
......@@ -85,3 +85,26 @@ Debugging
When building SPL with DEBUG set you may also need to set CONFIG_PANIC_HANG
as in most cases do_reset is not defined within SPL.
Estimating stack usage
----------------------
With gcc 4.6 (and later) and the use of GNU cflow it is possible to estimate
stack usage at various points in run sequence of SPL. The -fstack-usage option
to gcc will produce '.su' files (such as arch/arm/cpu/armv7/syslib.su) that
will give stack usage information and cflow can construct program flow.
Must have gcc 4.6 or later, which supports -fstack-usage
1) Build normally
2) Perform the following shell command to generate a list of C files used in
SPL:
$ find spl -name '*.su' | sed -e 's:^spl/::' -e 's:[.]su$:.c:' > used-spl.list
3) Execute cflow:
$ cflow --main=board_init_r `cat used-spl.list` 2>&1 | $PAGER
cflow will spit out a number of warnings as it does not parse
the config files and picks functions based on #ifdef. Parsing the '.i'
files instead introduces another set of headaches. These warnings are
not usually important to understanding the flow, however.
......@@ -50,25 +50,3 @@ For the areas that reside within DDR1 they must not be used prior to s_init()
completing. Note that CONFIG_SYS_TEXT_BASE must be clear of the areas that SPL
uses while running. This is why we have two versions of the memory map that
only vary in where the BSS and malloc pool reside.
Estimating stack usage
----------------------
With gcc 4.6 (and later) and the use of GNU cflow it is possible to estimate
stack usage at various points in run sequence of SPL. The -fstack-usage option
to gcc will produce '.su' files (such as arch/arm/cpu/armv7/syslib.su) that
will give stack usage information and cflow can construct program flow.
Must have gcc 4.6 or later, which supports -fstack-usage
1) Build normally
2) Perform the following shell command to generate a list of C files used in
SPL:
$ find spl -name '*.su' | sed -e 's:^spl/::' -e 's:[.]su$:.c:' > used-spl.list
3) Execute cflow:
$ cflow --main=board_init_r `cat used-spl.list` 2>&1 | $PAGER
cflow will spit out a number of warnings as it does not parse
the config files and picks functions based on #ifdef. Parsing the '.i'
files instead introduces another set of headaches. These warnings are
not usually important to understanding the flow, however.
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