[ECOS] small custom bootloader to start an app stored in flash

[Oleg Uzenkov]

Hi,

Please have a look to this document:
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf

on page 21 it says:
"Note This allows a linker to distinguish ARM and Thumb code symbols 
without having to refer to the map. An
ARM symbol will always have an even value, while a Thumb symbol will 
always have an odd value.
However, a linker should strip the discriminating bit from the value 
before using it for relocation."

May be this is why I have:

Entry point address:               0x8000111

entry point of odd value

Cortex-M4 supports only Thumb Mode and the entry point should probably 
be always odd.

My compiler flags:
-Wall -Wpointer-arith -Wstrict-prototypes -Wundef -Woverloaded-virtual 
-Wno-write-strings  -mthumb -g -O2 -ffunction-sections -fdata-sections 
-fno-rtti -fno-exceptions -mcpu=cortex-m4

Linker flags:
  -mthumb -Wl,--gc-sections -Wl,-static -Wl,-n -g -nostdlib -mcpu=cortex-m4

Oleg

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