Hello,
is this 32KiB for code and data?
You should also disable the Newlib reentrancy:
#define CONFIGURE_DISABLE_NEWLIB_REENTRANCY
Try to add:
CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
LDFLAGS = -Wl,--gc-sections
to the *.cfg file of the BSP. You need a proper linker command file to
use these options.
Avoid printf() and instead use printk() or no output.
For a really small RTEMS we need the constructor based initialization.
We should probably also get rid of the workspace and use static
initialization only.
On 17/12/14 17:00, Hesham Moustafa wrote:
Hi all,
I am working on reducing RTEMS size to fit into <32KB as every Epiphay
core has only 32KB of local memory. I was able to get hello and
minimum samples with aggressive size reduction by manually removing
un-needed code. Currently I only use libcsupport, sapi, score, rtems
built for cpukit only, and for each, some source code files were
removed. No IO, no FS, no barrier, event, managers are included. And I
added -Os flag. However when building ticker, the .text area overflows
the 32KB local memory by about 8KB.
The question is, what are the very basic mandatory sources/libraries
and/or managers that are enough to build ticker?
Regards,
Hesham
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Sebastian Huber, embedded brains GmbH
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