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Harald Welte 818133cd23 firmware: -nostartfiles -nodefaultlibs are not flags of LD but flags of GCC 
It seems that those flags have always been gcc flags, and not ld flags.

After decades of tolerating this, binutils 2.36.x no longer tolerates
those flags but prints an error:

arm-none-eabi-ld: Error: unable to disambiguate: -nostartfiles (did you mean --nostartfiles ?)

See also https://github.com/apache/nuttx/issues/3826 and the related
https://github.com/apache/nuttx/pull/3836 how this was solved in another
project - I adopted that solution here 1:1

Change-Id: Id199e4d03d5aae07a347c98f47791f42c12008c6
 		2023-11-22 14:12:26 +01:00
..
host trxcon/l1sched: tx_tch[fh]_fn(): fix sending idle CSD frames 2023-11-14 20:44:38 +00:00
shared l1gprs: migrate to gsm0502_fncmp() from libosmogsm 2023-09-26 18:11:27 +07:00
target firmware: -nostartfiles -nodefaultlibs are not flags of LD but flags of GCC 2023-11-22 14:12:26 +01:00
target_dsp Fix common misspellings and typos 2019-10-17 08:07:39 +00:00
Makefile fixup: gsmmap: move this utility to 'layer23/src/misc/' 2023-01-04 03:23:29 +07:00
README.building README.building: cosmetic: correct wiki links 2018-05-20 15:34:16 +03:00
README.development update git URLs (git -> https; gitea) 2022-06-18 13:59:31 +02:00

README.development 

= Contributing to OsmocomBB development =

Feel free to help us by extending the code.  Always make sure to
send back all your patches to Gerrit (recommended) or to the
baseband-devel@lists.osmocom.org mailing list - Free Software
is all about sharing. For details, see:

https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit
https://gerrit.osmocom.org/

== Coding Style ==

Like all C language Osmocom projects, we use the Linux Kernel coding
style, you can find it in the Documentation/CodingStyle subdirectory
of any Linux Kernel source. For details, see:

https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

== More Information ==

Please consult the https://osmocom.org/projects/baseband/wiki/.

If you have any technical questions regarding the code, don't hesitate
to ask the baseband-devel@lists.osmocom.org mailing list.

== subdirectories containing libraries and code ==

=== src/shared/libosmocore ===

This is a library of various utility routines, including linked lists,
message buffers, bit-vectors, memory allocator, signals, select loop
handling, timers - as well as some more specifically GSM related things
like a TLV parser, a Comp128V1 implementation and utility functions for
RSL (TS 08.58) and CC/MM/RR (TS 04.08).

libosmocore is maintained in https://gitea.osmocom.org/osmocom/libosmocore, so

	DO NOT DIRECTLY COMMIT TO libosmocore IN THIS REPOSITORY!

We simply maintain a copy (synchronized by git-subtree) in this
repository for the ease of building and to make sure everyone is using
the proper/compatible version of libosmocore

Please note, whatever you add to libosmocore will need to build as a
Linux userspace program (using glibc) just as well as on the OsmocomBB
embedded target without OS.  So please refrain from using fancy
functions.


=== src/target/firmware ===

The firmware is what we build for the actual target (phone).  It was
written with some idea of modularity in mind, i.e. we have

 * Ti Calypso specific code in calypso/
 * Analog Baseband code in abb/
 * RF Mixer code in rf/
 * Layer1 code in layer1/
 * NOR flash handling in flash/
 * LCD display handling in display/
 * minimal C-Library code in lib/
 * communications utility routines in comm/
 * Board (phone model/family) specific code in board/
   * board/compal_e88 is the Motorola C115-C124 family
   * board/compal_e99 is the Motorola C155 family
 * Applications (each app builds one firmware image) in apps/

=== src/target/trx_toolkit ===

A set of tools in Python for debugging TRX interface and creating
a virtual Um-interface between OsmocomBB and OsmoBTS. For details,
please refer:

https://osmocom.org/projects/baseband/wiki/TRX_Interface
https://osmocom.org/projects/baseband/wiki/FakeTRX
target/trx_toolkit/README

=== src/target_dsp/calypso ===

This is where we keep some (assembly) code that we wrote for
the DSP that is part of the Calypso DBB.

=== src/host/layer23 ===

The Layer2 (LAPDm / TS 04.06) and Layer3 (CC/MM/RR / TS 04.08)
implementations, as they are growing.