Date: Sat, 20 Apr 2013 10:49:49 -0700 From: Tim Kientzle <tim@kientzle.com> To: Thomas Skibo <ThomasSkibo@sbcglobal.net> Cc: freebsd-arm@freebsd.org, "Wojciech A. Koszek" <wkoszek@freebsd.org> Subject: Re: Plan for commiting Xilinx Zynq support to HEAD Message-ID: <88FE6A2E-DE39-4618-9B29-D721B8204EE7@kientzle.com> In-Reply-To: <51716D69.2090808@sbcglobal.net> References: <20130416212535.GE16132@FreeBSD.org> <CAJ-VmokBrj70yMyZ5prB_KAW7SPXCiRfHpZ-PJvjbsNkYxhDcQ@mail.gmail.com> <516EBE26.60505@sbcglobal.net> <20130418174501.GF16132@FreeBSD.org> <6E0C620F-D46C-4D01-86AE-0F364C67500F@bsdimp.com> <40A37850-F9A5-44A1-8379-2ED53B0D62E0@kientzle.com> <51716D69.2090808@sbcglobal.net>
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On Apr 19, 2013, at 9:14 AM, Thomas Skibo wrote:
> On 4/18/13 10:03 PM, Tim Kientzle wrote:
>>=20
>> On Apr 18, 2013, at 10:49 AM, Warner Losh wrote:
>>=20
>>>=20
>>> We do need it documented on the wiki regardless of the automation we =
put into place. The problem with scripts is that accrue arcane knowledge =
that later becomes hard to reconstruct.
>>=20
>> Should be in the Wiki, yes.
>=20
> I think something needs to go into the Wiki. I think I need to =
describe the process of booting on Zynq and how I build u-boot, =
BOOT.BIN, ubldr, etc.
Having documented this myself for a bunch of boards now, here are some =
suggestions:
For U-Boot:
* Key piece of information is where you got the sources from. There
are a lot of U-Boot repos out there with different board support.
Specifying a particular tag helps a lot. If the upstream changes
quickly, setting up your own clone on github may be the only
practical way to provide stable source.
* What toolchain you built with? I've been building with FreeBSD's xdev
toolchain. It works well but requires a few standard patches
to build U-Boot on FreeBSD/ARM:
=3D -print-file-name=3Dinclude is used in config.mk but is broken
on FreeBSD. I'm trying to get that fixed. The workaround
is to patch it to hardcode /usr/include
=3D Add -lc to PLATFORM_LIBS since FreeBSD/ARM has some
arithmetic support routines in the wrong place (they should
be in libcompiler_rt but are only in libc).
=3D Some U-Boot forks now have GNU sed dependencies.
* Finally, the patches for the board configuration itself. (Enabling
API and ELF loader, for example. Rewriting the bootcmd.)
Hopefully, the above is all you'll need.
For ubldr:
Apart from the usual buildenv juggling, you shouldn't need anything =
special other than
UBLDR_LOADADDR=3D<load address>
If you do, let us know. A few of us have been trying to make ubldr more
generic with an eye towards eventually having a single ubldr binary that
runs "everywhere."
Tim
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