Compilation for ARM

[Stepan Dyatkovskiy]

Hi all,

Currently I'm trying to compile kernel, with activated cortex-a9 or a15 
options (TARGET_CPUTYPE=cortex-a9).
Currently "as" from buildworld gives me tons of "unknown instruction" 
errors. That happens, I suppose, due to its release date (2007).

So I have tried newer versions of binutils:
1. devel/cross-binutils from ports. I have built it with TGTARCH=armv6 
and TGTABI=none-eabi.
2. Binutils from http://ftp.gnu.org/gnu/binutils/

I did it in several steps:
1. I have built them.
2. I have entered buildenv: "make TARGET_CPUTYPE=armv6 buildenv"
3. # which as
4. # cp /usr/obj/arm.armv6/usr/src/tmp/usr/bin/as 
/usr/obj/arm.armv6/usr/src/tmp/usr/bin/as.bak

Below I tried several ways to replace as/ld/and-friends:
5. cp /usr/local/bin/armv6-none-eabi-as 
/usr/obj/arm.armv6/usr/src/tmp/usr/bin/as
6. I have also tried "ln -s"

7. # make KERNCONF=PANDABOARD TARGET_CPUTYPE=cortex-a9 buildkernel

Whatever I did, it always ended up with

/usr/src/sys/arm/arm/locore.S: Assembler messages:
/usr/src/sys/arm/arm/locore.S:79: Error: duplicate .fnstart directive
/usr/src/sys/arm/arm/locore.S:255: Error: .fnend directive without .fnstart

So, may be, you guys know how to deal with that?

Currently I have no idea :-(.. May be sleep a bit :-)

Thanks!

-Stepan

Stepan Dyatkovskiy wrote:
> Hi all,
>
> Thanks for advices!
>
> That's interesting. I have managed to launch kernel, using these u-boot
> binaries:
> http://people.freebsd.org/~gonzo/pandaboard/
>
> Looks like specific MLO. But I'm not sure.
>
> With regular linaro u-boot, I load kernel.bin, then try start it with
> "go", and nothing happens. With binaries of this Gonzo guy, I did the
> same, and everything works fine :-/ Do you know who is it (I mean
> Gonzo)? I would like to ask him, what he did in his binaries.
>
> Another question:
> I would like to build FreeBSD, using latest clang. Currently I have
> tried to build it latest svn version of FreeBSD:
> svn://svn.freebsd.org/base/head/
> With command:
> make TARGET_ARCH=armv6 buildworld TARGET_CPUTYPE=cortex-a9
>
> But got next error (repeated several
> times):/tmp/jemalloc_atomic-22cc38.s:21: Error: garbage following
> instruction -- `dmb ish'
>
> So perhaps, its better to use stable version (10.0.0), but with new
> clang. Currently, I'm going to copy clang sources from HEAD into 10.0.0
> sources tree. But perhaps there is better way to do it?
>
> Thanks!
>
> -Stepan
>
> Ian Lepore wrote:
>> On Thu, 2014-06-12 at 01:44 +0600, Stepan Dyatkovskiy wrote:
>>> Hi guys,
>>> Thank you! I have built it successfully. It was really simple. Currently
>>> I'm trying to launch with u-boot. Are here any instructions/manual how
>>> to run kernel with u-boot?
>>> Thanks!
>>> -Stepan
>>
>> If you compile the dtb into the kernel, you can launch the kernel
>> directly from u-boot.  If you don't, then you need u-boot to launch
>> ubldr (loader(8) that uses the u-boot API, which requires a u-boot with
>> the API option enabled).
>>
>> The kernel can be loaded at any 1MB-boundary address, and can be
>> launched by jumping to the load address + 0x100, such as:
>>
>>    fatload <device/partition> 11000000; go 11000100
>>
>> If you are using a modern u-boot that enables data caches, you need to
>> turn them off manually, like:
>>
>>    fatload <device/partition> 11000000
>>    dcache off; dcache flush
>>    go 11000100
>>
>> This is just a u-boot quirk, it disables caches on bootm and bootelf
>> commands, but not on a "go" command.
>>
>> -- Ian
>>
>