From: Oleg Uzenkov <o.uzenkov@unicore.co.ua>
To: Rainer Arndt <arndt@ibehs.de>,
Edgar Grimberg <edgar.grimberg@gmail.com>,
Sergei Gavrikov <sergei.gavrikov@gmail.com>
Cc: eCos Discussion <ecos-discuss@sourceware.org>
Subject: Re: [ECOS] small custom bootloader to start an app stored in flash
Date: Thu, 23 Oct 2014 11:50:00 -0000 [thread overview]
Message-ID: <5448EB7B.5080203@unicore.co.ua> (raw)
In-Reply-To: <1C548879-90CC-458E-966B-0A8C88C4D7A6@ibehs.de>
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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prev parent reply other threads:[~2014-10-23 11:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-21 8:27 Oleg Uzenkov
2014-10-21 11:02 ` Gary Thomas
2014-10-21 13:25 ` Edgar Grimberg
[not found] ` <CAPrjMDAi=cqTSQ-d-c9FF53W-c6=v0j8rzSLQfuTcBQUY43Zpw@mail.gmail.com>
2014-10-22 11:08 ` Oleg Uzenkov
2014-10-22 13:17 ` Edgar Grimberg
2014-10-22 14:40 ` Oleg Uzenkov
2014-10-23 9:55 ` Edgar Grimberg
2014-10-23 12:53 ` Edgar Grimberg
2014-10-23 15:03 ` Oleg Uzenkov
2014-10-23 19:25 ` Rainer Arndt
2014-10-23 21:21 ` Sergei Gavrikov
2014-10-24 7:44 ` Oleg Uzenkov
2014-10-24 8:36 ` Sergei Gavrikov
2014-10-24 9:13 ` Oleg Uzenkov
2014-10-24 9:13 ` Sergei Gavrikov
2014-10-22 19:01 ` Rainer Arndt
2014-10-23 11:50 ` Oleg Uzenkov [this message]
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