[OpenWrt-Devel] Toolchain for armv7-ar?

Thu Nov 9 06:56:56 EST 2017

Hi Florin.

There is no (need of) filesystem on our SOC.

Our software-framework is all in bare-metal C, and we simply compile it
using the Atmel-Studio.
We only are unable to obtain proper libcrypto.a and libssl.a, as a result
of which we are unable to use openssl.

Actually, I am sorry if I am using toolchain in the wrong sense.

What we really need is to compile openssl for our processor, that's it (of
course with a proper compiler that supports -mthumb), and generate
libcrypto.a and libssl.a.
We will then simply statically-link these two libraries with our framework,
and (only) the required .o files from these two libraries will then be
linked in the singular-binary (which we then obviously flash onto the SOC
through JTAG).

Thanks Florin for your quick help .... I am obliged ..

Thanks and Regards,
Ajay

On Thu, Nov 9, 2017 at 4:55 PM, Florin <floring2502 at gmail.com> wrote:

> Hi Ajay,
>
> There have been lots of discussions recently as OpenWrt is developing into
> LEDE, a linux for generic embedded systems, not only for routers.
> The Atmel Cortex M4 120Mhz will probably be very slow running my
> toolchain, especially if the RAM is only 512kB. My Cortex A9 is 800MHz and
> 128MB of RAM and runs pretty fast when setting 1GB of swap file o USB-3.0
> HDD.
> First of all, which C library are you using, glibc or uclibc on your
> framework? I've built my toolchain specifically for glibc-2.20 with root
> filesystem residing on /opt. Since I've ported binutils-2.26.1 from Debian
> source, it will work with sysroots but gcc is not yet with sysroots
> enabled; I am going to enable it  while upgrading to the latest gcc-4.9.4
> from Debian source (the last gcc-4.9 to be supported); this time will also
> have gcj and OpenJDK running, but it's still work in progress (I am
> debianizing it and couldn't find out why libphobos compilation is never run
> by dpkg-build, although it is configured and doesn't give any error; - any
> Debian exprt knows about it? - ).
>
> Openssl is already available for this kind of optware, there is a version
> in the link I've sent you (but it's dynamic and should reside in /opt/lib).
> I have a more recent version myself, including the dev package with
> statically linked library, but you need to make sure the toolchain will
> work for you.
> Also, does your platform run opkg?  If so, I can make a link for the
> essential packages for the toolchain to work and give them to you (they
> will install in /opt as stated above).
>
> Best wishes,
> Florin
>
> From: Ajay Garg [mailto:ajaygargnsit at gmail.com]
> Sent: Thursday, November 09, 2017 12:10 PM
> To: Florin
> Cc: Karl Palsson; openwrt-devel
> Subject: Re: [OpenWrt-Devel] Toolchain for armv7-ar?
>
> Thanks Karl and Florin for the replies.
>
> Ok, so the first thing I need to understand is OpenWRT is for building
> linux(-like) systems (only) for routers .. thanks guys for this clearance.
>
> Florin,
> I'll tell you my usecase in a bit of detail.
> * We have a framework, with openssl-client code written.
> * We port our framework to multiple platforms/devices, and then link
> libcrypto.a and libssl.a as and when required.
>
> For the SOC with processor https://www.digikey.com/
> product-detail/en/microchip-technology/ATSAM4E8CA-AUR/
> ATSAM4E8CA-AURCT-ND/4140758, everything has been done, but we are stuck
> on integrating openssl due to being unable to build compatible libcrypto.a
> and libssl.a for the same.
> I almost got things done by tweaking things with the "Freescale i.MX 6"
> configuration, but failed when I added the -mthumb option.
> Since then, I have been trying all sorts of things, to firstly build a
> toolchain (in ubuntu-14.04 host) supporting -mthumb, and then compile
> libcrypto.a and libssl.a for the same.
> So, if there is a (existing/available) toolchain in openwrt that would
> compile for armv7-a with -mthumb, I think all I need to do is go into
> packages/libs/openssl, and fire "make -B". Kindly let know if something can
> be done for the same.
>
> Once again, thanks everyone for the help so far ... looking forward to
> learning more from you experts..
>
> Thanks and Regards,
> Ajay
>
>
> On Thu, Nov 9, 2017 at 2:32 PM, Florin <floring2502 at gmail.com> wrote:
> I've got a toolchain (gcc-4.9.2 + binutils-2.26.1) running on armv7-a and
> ipk packages  compiled with/for it:
>
> floring at huawei:~$ gcc -v
> Using built-in specs.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/opt/usr/libexec/gcc/arm-linux-gnueabi/
> 4.9.2/lto-wrapper
> Target: arm-linux-gnueabi
> Configured with: ../configure --host=arm-linux-gnueabi
> --target=arm-linux-gnueabi --prefix=/opt/usr --with-gmp=/opt/usr
> --with-mpfr=/opt/usr --with-mpc=/opt/usr --with-isl=/opt/usr
> --with-cloog=/opt/usr --enable-languages=c,c++,go,objc,obj-c++
> --disable-multilib
> LDFLAGS_FOR_TARGET=-Wl,--dynamic-linker=/opt/lib/ld-linux.so.3
> LDFLAGS_FOR_HOST=-Wl,--dynamic-linker=/opt/lib/ld-linux.so.3
> LDFLAGS=-Wl,--dynamic-linker=/opt/lib/ld-linux.so.3
> Thread model: posix
> gcc version 4.9.2 (GCC)
>
> The architecture is a Huawei-ES880 (Cortex A9 without FPU) router running
> Zyxmon's DD-WRT mod for Northstar platforms. I've even been able to compile
> and run Xorg, GTK 2 and 3 and Qt 4.8.2 as optware on it, and I am
> currently
> working on upgrading gcc and "debianize" it. So I kinda run a complete
> linux
> on this architecture.
> I've started it from cross-compiling glibc and gcc and installing them on
> scratch /opt filesystem, and to simplify things I used some of Zyxmon's
> Qnapware (http://qnapware.zyxmon.org/binaries-armv7/); If you only need
> some
> essential packages, this link would be enough.
>
> I am doing it as a hobby, but my problem is that I don't have a large
> traffic subscription so I cannot make it largely public. If you need more
> than the packages in Qnapware, especially the native arm-v7a toolchain,
> then
> I could share my work. Keep in mind that these embedded systems have
> limited
> RAM so you need to setup at least 1GB of swap space and set TMPDIR variable
> on external HDD directory for making all these work.
>
> Florin
>
> > -----Original Message-----
> > From: openwrt-devel [mailto:openwrt-devel-bounces at lists.openwrt.org]
> > On Behalf Of Karl Palsson
> > Sent: Wednesday, November 08, 2017 10:54 PM
> > To: Ajay Garg
> > Cc: openwrt-devel
> > Subject: Re: [OpenWrt-Devel] Toolchain for armv7-ar?
> >
> >
> > That part is armv7-m (not -a, not -r). They don't generally run linux at
> all, so
> > don't have toolchains targetting linux, and don't generally have existing
> > targets in openwrt.
> >
> > You _can_ run linux on them, but it's a farrrr bigger task than just,
> "which
> > toolchain do I need to select in menuconfig"
> >
> > Cheers,
> > Karl P
> >
> > Ajay Garg <ajaygargnsit at gmail.com> wrote:
> > > Experts,
> > >
> > > Waiting for your kind reply/replies.
> > >
> > >
> > > Thanks and Regards,
> > > Ajay
> > >
> > > On 7 Nov 2017 11:22 a.m., "Ajay Garg" <ajaygargnsit at gmail.com>
> > > wrote:
> > >
> > > > Hi All.
> > > >
> > > > I have been trying to build the toolchain+packages (especially
> > > > openssl) using openwrt, but have been unable to do so for a armv7-ar
> > architecture.
> > > >
> > > > The processor on our SOC is
> > > > https://www.digikey.com/product-detail/en/microchip-
> > > > technology/ATSAM4E8CA-AUR/ATSAM4E8CA-AURCT-ND/4140758
> > > >
> > > > So, is there an (already existing) configuration (in "make
> > > > menuconfig", or
> > > > otherwise) that builds everything (toolchain plus packages) for
> armv7-ar?
> > > >
> > > >
> > > > Will be grateful to listen from you experts.
> > > >
> > > >
> > > > Thanks and Regards,
> > > > Ajay
> > > >
> > > _______________________________________________
> > > openwrt-devel mailing list
> > > openwrt-devel at lists.openwrt.org
> > > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>
>
>
> --
> Regards,
> Ajay
>
>

-- 
Regards,
Ajay
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.infradead.org/pipermail/openwrt-devel/attachments/20171109/f0ac42b8/attachment.htm>
-------------- next part --------------
_______________________________________________
openwrt-devel mailing list
openwrt-devel at lists.openwrt.org
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel