[U-Boot] [PATCH] arm64: Add Xilinx ZynqMP support

[Tom Rini <trini@konsulko.com>]

On Mon, Mar 02, 2015 at 09:10:26AM -0800, S?ren Brinkmann wrote:
> On Mon, 2015-03-02 at 04:07PM +0100, Michal Simek wrote:
> > On 03/02/2015 03:23 PM, Tom Rini wrote:
> > > On Mon, Mar 02, 2015 at 09:24:45AM +0100, Michal Simek wrote:
> > >> On 03/02/2015 08:32 AM, Michal Simek wrote:
> > >>> On 02/27/2015 06:13 PM, Tom Rini wrote:
> > >>>> On Tue, Feb 24, 2015 at 09:02:09AM +0100, Michal Simek wrote:
> > >>>>
> > >>>>> Add basic Xilinx ZynqMP arm64 support.
> > >>>>> Serial and SD is supported.
> > >>>>> It supports emulation platfrom ep108 and QEMU.
> > >>>>>
> > >>>>> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> > >>>> [snip]
> > >>>>> +/* Miscellaneous configurable options */
> > >>>>> +#define CONFIG_SYS_LOAD_ADDR		0x8000000
> > >>>>> +
> > >>>>> +/* Initial environment variables */
> > >>>>> +#define CONFIG_EXTRA_ENV_SETTINGS \
> > >>>>> +	"ethaddr=00:0a:35:00:01:22\0" \
> > >>>>
> > >>>> No, you can't hard-code an ethaddr in.
> > >>>
> > >>> ah yeah.
> > >>>
> > >>>>
> > >>>>> +	"kernel_addr=0x200000\0" \
> > >>>>> +	"initrd_addr=0xa00000\0" \
> > >>>>> +	"initrd_size=0x2000000\0" \
> > >>>>
> > >>>> These are really close together.  And I imagine mirror the usual values
> > >>>> on 32bit platforms.  Maybe it's time to move them around a bit for more
> > >>>> space?
> > >>>
> > >>> Currently I haven't had any problem with these values but I just don't know
> > >>> what will happen in future.
> > > 
> > > Right.  That's partly why I moved as much of the TI ARMv7 parts to the
> > > Linux kernel defined limits a while back, people managed to bump into
> > > overruns doing valid things.  I'd really like to see things default to
> > > something closer to the defined limits to start with and avoid those
> > > kind of problems a few years down the line.  8MB is fine for now but I
> > > can see people running over that and going "why does my initrd boot
> > > fail".
> > 
> > We will use FIT image and all these values won't be needed but
> > they are need to be here.
> > I have removed unused initrd_X in v2 because it is completely unused.
> 
> Well, I haven't used FIT images so far and don't see why I should. Can we
> please put the initrd at the highest address amongst kernel, DT and
> initrd? The initrd is most prone grow. My current one is beyond 100MB.
> Let's just spread things out, there should be enough memory for this.

Only along with doing bootm_size so that however data is passed in, we
make sure it ends up (a) not overlapping and (b) where the kernel will
see it.

-- 
Tom
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